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I think I am ready to flash my bios but need a little help as this will be my first time doing a flash but am confident with a little guidance on the right BIOS I can make it happen. I bought a used Gigabyte HD 7970 3072MB GDDRS the other day on craigslist and have tried everything to get past 550 Kh/s via scrypt mining. When mining BTC i get around 650 Mh/s but havent played to much with that area as I am trying to get the scrypt mining down. At this point It seems I have tried almost everyones configurations on the forums and even started from ground up with the README file and still nothing above 550 Kh/s. That is also using -g 1 as when i use -g 2 it stays under 390 kh/s? I am thinking at this point my BIOS may be too old on the card as these are my current stats on my windows 7 rig:

Display device       : AMD Radeon HD 7900 Series on Tahiti GPU
Display driver       : 9.14.10.0969, Catalyst 13.4
BIOS                 : 015.022.000.004
GPU: Gigabyte HD 7970 3072MB GDDRS - GV-R797OC-3GD


Looking at http://www.techpowerup.com/vgabios/index.php?manufacturer=Gigabyte&model=HD+7970 (http://www.techpowerup.com/vgabios/index.php?manufacturer=Gigabyte&model=HD+7970) there seems to be much newer BIOS versions although I am not sure which BIOS to flash with since i have a OC model and I have read that is not the best for scrypt mining hence needing to try a TO??

My current config for cgminer is :


As I mentioned I tried -g 2 as suggested from everyone and every time it drops dramatically down to 380 Kh/s from 540 when using -g 1. When following the ReadME file for Cgminer my ThreadConcurrency speed came out to be 22400 but have read to use 8192 and see no difference in speed between the two. So at this point I am thinking a flash of the bios will be the way to go although I am still up for hearing anyones suggestions :) Thanks for the help in advance! this is driving me crazy..rawwr

you dont need to bios flash. scrypt mining is strange voodoo and requires a magic combination of core speed, memory speed, thread concurrency, intensity, and -g switches to get the optimum hashrate without hw errors. The only way to do this is trial and error.

wouldn't flashing allow him to undervolt and raise mem and gup??

That is my take on it as pretty sure that is my issue right now? oh to flash or not to flash

\

gigabyte triple fan gpus are voltage locked, period. no amount of software changes or bios changes will change the voltage. it's hardware locked because gigabyte is too cheap to to put components on the PCB that allow the user to change voltage. unless you have multimeter probe reading or kill-a-watt reading to prove me wrong, this is what I will continue to believe and spread.

good to know and thanks for the advice! Going to hold off on flashing for another week and so some more trial and error as well as try going back to 13.1 from 13.4 catalyst. I used to have a NVIDIA GPU in the system so do you think any of that software might be messing with the new AMD Catalyst?

never buy gigabyte cards

does that mean I am stuck with a 550 Kh/s? or just that it will take me forever to find the right magic code?

For scrypt mining you should increase intensity to 18 or 19.
Maybe that will help you.

But, you should definitely get more than 550 with a 7970 (should get close to 700)
I only have the MSI ones, so not sure if my settings would be good for you, but every card is actually a little different and the best way is to just play with different values until you find something that works.

Also, I suggest --temp-target 81 --auto-fan (instead of --gpu-fan 100), because no need to waste the power to run the fans at full speed unless you have to, but that's less important.

anytime I go to a intensity other then 13 it shoots down from 550 to a 380ish. recently switched to autofan which seems to be a little less noisy and am going to put temp 81 going forward. What catalyst and sdk versions are you running?

I just realized you're on Windows. I have heard that the catalyst 13.x drivers have known problems. Maybe you should try rolling back to 12.8 or 12.10 (do custom install for the driver only) and install SDK version 2.7 separately.

Maybe someone else has some more insight... I am probably not the best to give you advice though as all my rigs are Linux (I use catalyst 12.8 and SDK v 2.8, for what its worth).

I am actually going to try just that tonight as I have heard the same thing now a few times so lets hope for the best! although I keep seeing something about installing Chip sets? Is that different then the catalyst and sdk installations?

FWIW, Win7 64bit, 13.6 beta2 drivers here CGminer 3.2.1. 2 x Gigabyte 7970 GHz Editions (voltage locked). Hashing ~769Kh/s on stock 1100/1500 clocks. I have them on powered risers now but before that they were doing ~734Kh/s with 1045/1500 clocks, anymore or less on the core clock would see the hash rate drop sharply both with or without risers. Same deal with memory increase/decrease... Setting intensity to anything other than 13 would also drop hash rate sharply. Using --shaders instead of --thread-concurrency also dropped hash rate sharply as did using -g 1. Side note, despite setting --thread-concurrency to what cgminer detected originally (22400) it too resulted in a massive hashrate drop.

Without risers - Catalyst 12.6 beta, 13.4, 13.6 beta drivers ~734Kh/s

With risers - Catalyst 13.6 beta, 13.6 beta2 drivers ~769Kh/s

You can view my "before risers, driver/cgminer upgrade, remove rig from open case and put on shelf" stats Here (http://myminer.info/joori-rig-2x-gigabyte-radeon-hd-7970-ghz-edition/).

As mentioned earlier, you really do need to just 'fudge' with it as it's all trial and error... I also read it's a good idea to delete the .bin files in the cgminer folder when adjusting settings on the command line. I found 50% of the time this would solve any issues I might have had tho the other 50% of the time I saw no change in my issues. The biggest change I saw was going from 13.6 beta to 13.6 beta2 drivers, an increase of ~30Kh/s although I'm unsure if this was due to the driver upgrade since I did so when I installed the cards on their risers. To achieve these results I cleared the .bin files, turned off AMD Overdrive in catalyst and just ran cgminer.exe -I 13. Let it decide what to use and go from there increasing/decreasing clocks and/or intensity within the running app. You'll hit a sweet spot eventually, or be like me, try the same settings over and over then one day like pure voodoo magic those same settings work a treat when previously they made things worse ;D

Don't flash your bios, you shouldn't really need to and I considered going down that route after pulling my hair out trying to get these darn things to play nice... If you do flash, make sure you backup your original bios. ALWAYS BACKUP...just incase...

--gpu-powertune 10 --gpu-engine 1090 --gpu-memclock 1500 --thread-concurrency 8192 --gpu-reorder -I 13 --worksize 256 -g 2

gets me 750-760s on Sapphire 7970s

First off thanks everyone for trying to help me solve this. Right now this is the best I can get at 560 kh/s  :


I am now on Catalyst 12.8 with SDK 2.7 and have tried 13.1 with 2.7 as well as 13.4 and all the same not going past 550 kh/s


Using this config I drop to 530 so that was a no go.




Tried both of those configs and nothing past 530/540 which is another dead end. One thing i did notice thought when going from 13.4/13.1 Catalyst down to 12.8 I can now get 560 using -g2 where I could only get 550 using -g 1 before and a -g 2 would always bring me down to 380? Does that mean 12.8 might be the right version going forward? I guess i should also try going to your 13.6 beta and see what happens.

I did readme from scratch again and my TC came out to 22400 every time and Memclock crashed on 1675 so brought it down to 1650 s it stated to do so. Crashed 10 minutes later so went to 1625 and testing it there but from the looks of it 1500 seems to be the way to go from everyone else so should I just play with that instead of wasting time going down from 1625? I then tried every engine speed going up by 5 from 850 and then down 1 at a time until I came to Engine speed of 1080 giving 560/khs setting. From there I tried everything else in the book, then scratched my config and tried 30 more and am still stuck at nothing past a 560..crap! BAck to square one but going to keep trying every little config in the book until it is right! thanks for everyone's help

I'm sorry you're having such difficulty with these cards. I'd probably stick to 1500 mem as MSI Afterburner is showing me very little memory usage while scrypt mining, seems rather odd but I can live with that. I saw no hashrate difference when adjusting the mem except for the card crashing past 1800 mem so I left it at it's stock. It's certainly helped with keeping the silly VRM's temp down thats for sure... Give the beta2 drivers a shot they won't hurt the card might actually give you a small increase. Then again, it might not but it's nice to rule out that version nonetheless...

Just be sure to use the amd driver cleanup utility when changing drivers. You don't want any remnants of previous drivers screwing with your results, that and amd overdrive = off. Other than that I really don't know what else to say. This card is being stubborn  :D

tiny update! So i ended up flashing the GPU with the most updated GIGABYTE BIOS and am now getting 590 kh/s almost out of the box settings =D that is about 40 more then I was able to get past for the last week so progress finally made.

I used the F3BIOS to flash : ATI Source BIOS Version:015.032.000.004
http://www.gigabyte.com/products/product-page.aspx?pid=4102&dl=1#bios

I then went back to 13.1 catalyst and am on 2.7 SDK as when I try to instal 2.8 SDK i get something about installation pkg error fail?

So the fact that I have pushed past the 550 mark pretty easily on the new BIOS means I am off to a good start right? Now to just get past 600 and maybe 7? If you think I should flash with a different BIOS please let me know as there were many to choose from and just chose the most recent. Thanks guys!


thanks for the advice! going to keep with 1500 mem as that seems to be pretty norm for everyone else are just start messing with engine more so. Tempted to go to 13.6 as your the only one to say good things so far..hmmm what windows are your running?

I spent weeks faffing around and couldn't get past 550kash with the same card.

Clock speeds set in Afterburner 1045/1500.

I use cgminer, make sure you run this first:


I use the following command and get 650khash+


I user Catalyst 13.5, haven't touched bios, voltages etc.

http://i41.tinypic.com/ano3ex.png

My GV-R797OC-3GD rev 2.1 gets about 720Kh/s with the following

Catalyst 13.3
BIOS 015.025.000.007.000000
GPU_MAX_ALLOC_PERCENT unset

Hope that helps ;)

Good stuff, glad you got an improvement through flashing looks like there's still hope for the card yet! If you're hitting 590Kh/s then realistically 600+ isn't that far off. It's a matter of just tweaking now and finding the right driver. I'm using Windows 7 Ultimate and Catalyst 13.6 beta2 drivers on my rig and one of the cards has a dummy plug I made with a few resistors. Despite the fact recent versions of catalyst dictate you no longer need a dummy plug, I find I still have to use one otherwise I'll either get a series of ADL/OpenCL errors and/or one of the cards will hash stupidly low. Like in the 30Kh/s-70Kh/s range :\

Also, why are people using both --shaders and --thread-concurrency together.. the latter overrides any value set by the former so it's kinda pointless.. as is lookup-gap since it's already set at a default of 2 anyway. I had so much trouble fiddling with settings wondering why my cards weren't hashing as everyone else's or even remotely close. Point being, 700+Kh/s should be easy to attain with minimal input parameters unless ofcourse the card really is defective or just plain shit  ;D

Thanks for the advice everyone! Going to do another BIOS flash with BIOS 015.025.000.007.000000 now that I am fully comfortable doing it and then reinstall with 13.3 and try nitrogenetics configs.  The if no go reinstall with a 13.6 beta 2 and try Joori configs. If no go then off to sprint347 configs in 13.5 catalyst. Something is bound to make happen but one thing I think may be the issue now is I have a voltage locked card which seems to be a GIGABYTE hardware issue. Through some settings I was actually able to get 730/750 but was using I -20 and -g 1 with 1500 memclock and 1100 engine but was shooting up temp like no other which is imagined and turned it off when it climbed to 86 and kept going. When used -20 for -g 2 it had a 20-30 Kh/s so not sure why that is but still working through all the trials of fun :/ Will keep you all posted on the progress but progress is being made..yes! p.s. if you are buying a 7970 probably would stay away from GIGABYTE with locked voltage which kinda blows

p.s. could my 650w PSU have anything to do with it? it says 550w is needed so assuming i should be ok right? just running this one GPU and the CPU on this machine. Pure miner.

whati is you original bios if it come with F80, you wont' be able to falsh it with 7950 f43 bios, and it won't get higher than 700 650kh/s maybe

if it come with f72 bios you can flash it with 7950 f43 bios an it can run 730khs @ 1040 1250

as long as there are workaround for new card, i suggest you not to buy it
not worth now

but if it have workaround, giga is best choice regardless of voltlock

Not sure what F# the original Bios was but it was this : BIOS  015.022.000.004
Which do you recommend me going to in the end? and do you possibly have a link so I can flash that now before going forward?
I found this link but do not see a F43 : http://www.gigabyte.com/products/product-page.aspx?pid=4102#bios
I see a F3, F72, F41_A and f2.

There is also this link with more Gigabyet cards. I do have the r79703GD model

http://www.techpowerup.com/vgabios/index.php?manufacturer=Gigabyte&model=HD+7970

Basically it looks like i kind of have two options in Bios picking..a 1100/1500 or 1000/1375...any ideas on which would be the best to continue my testing? Thanks!!

Your PSU is more than enough.

A 7970 draws 350W max OC'd.

Thank you! thought that was the case but wanted to double check so that variable wouldn't be added to the 15678,000 others i am dealing with ;)  thanks!




What SDK version are you running btw? and are you on 13.3 beta 3? Installing that now with SDk pkg installed and everything in it but thinking I should reinstall and uncheck SDK and then install 2.7?

BIG UPDATE!!!!  Installed 13.3 and it did nothing actually made the hash rate spike all over the place in a 2-40 kh/s range. I uninstalled then installed 13.6 beta 2 drivers.

I chose this config to start and it jumped to 750 and hit even 780!!!  :


a few minutes later screen went black and computer crashed :/  Brought engine down to 1045 and memclock to 1450 and am running at 730 kh/s at about 81temp at the moment. Just started it though a few minutes ago. Atlas 13.6 and the updated BIOS did some magic trick and can now play with the rest to see what doesnt crash the GPU. Thanks guys!!!!

Gigalock

The voltage lock shouldn't be an issue mine are locked and I still got them hashing over 700Kh/s. Infact, they're doing 770Kh/s each atm and sitting between 65-75C. It was a pain in the arse to get them to play nice but persistence is the key to virtue - also an open rig setup for proper cooling and the right command line helped massively. See below for imagery! ;)

Sexy Image of Rig (http://imgur.com/eWclj9s)

Miner Monitor Stats (http://imgur.com/ceKzyov)


Awesome stuff mate, stoked you got there in the end haha you see, no need to have 346423874623 options on CGMiner startup. A simple clean command line and the help of a BIOS flash coupled with latest drivers (bleeding edge too!) got you there in the end. Beta drivers ftw!! Just curiously what was the temp before the screen went black? It probably shut down cause it overheated I'm thinking. They really do run rather hot and require decent cooling to keep them stable and free from burning out. Those pesky VRM's have piss poor cooling on their own and I had to move the entire setup out from an open case onto a rack with adequate spacing just to keep the temps down :\

Really happy you got things going in the end :D

At the moment running at around 83-85 the screen seems to go black and computer freezes so its not going to crazy to shut it off right? Had to run out for a bit and let it go with a 1050/1500 on 22400 TC and came back to a crashed computer so that is where I am at now. During some testing yesterday I was able to get it to 730kh/s but that was with -I 20 and it ran past 87temp so I shut it down and scratched that config. I think right now I am going to start back from square one with the readme on these drivers and see what I get. So close I can taste it!

edit*update*: Went through the readme again and didn't have much luck as everything kept blacking out or freezing. I came up with a TC of 22400 again then messed memclock and started crashing GPU at 1650 so brought it down to 1625 and started engine speed of 925(around .56) as suggested which started with a 480 kh/s. Slowly worked my way up then around 970 with a 530 kh/s speed it crashed again. At the moment anything I seem to try brings the computer to a black then freeze. I even tried going from 1375 clock and 1000 engine which were defaults for MSI afterburner and yet crash again. So now I can get the speed but always going to black screen? Would that be 13.6 beta 2 drivers bugging out or is that something with my clock and engine ratio? confused yet again but looking up!

I'm running driver's included sdk. I just checked 13.6b2 and they seem to be a little better than 13.3 (doing around 730Kh/s @1042/1500).
My preferred clock ratios are
1042/1500 ~730Kh/s
995/1250 ~690Kh/s

Thanks for the update! Seems to be when I use the default clock 1375 i cannot go past 940 on engine speed as I seem to go black then crash after a few minutes after..running stable right now a new config I am trying with tc 8192 and 925/1000 and getting 650 khs. Wont be happy till i am stable at 700+ so will keep trying. Maybe your 995/1250 will bump me up a bit. Will be in touch and thanks again!

This command is getting me 720khash on the same card/rev.

Thanks for sharing :)

it is 7950 bios
to check f# use gigabyte utility

so for a 7970 then a F43 bios is a no go? right now i am running stable at 640 kh/s with a 925/1000 but running temp at around 83/84 so higher then i would like. Anything above a 940 engine seems to go black screen. Going to do some more testing tonight and keep the good fight coming..at least i am out of the 500's now..yes!

Out of curiosity what is everyone's default GPUengine/Memclock for their 7970 especially those running with a 1000+/1500 speeds?

The BIOS i flashed to has a 1000/1375 so I am now curious If I should of flashed to the BIOS with a 1100/1500 as anything past a 940 engine seems to crash with a black screen. Currently though I am running stable at 640 kh/s with 82/83 temp using 910/1000 and tc8192 which seems to be the best I can currently achieve. Going for that 700plus goal!

Hey, so I use F62 bios, it has 1100/1500 default clocks. I clocked it at 1085 and 1500 to get constant stable 760 khs

BTW OC is the same as TO - rev 2.1 board, just different bios. You can force flash your OC to TO using atiflash -f command.

bam! thanks man :) just flashed to that new F62 BIOS(http://www.techpowerup.com/vgabios/131592/gigabyte-hd7970-3072-121214.html) which was a TO not really knowing the difference I took a chance seeing the default speeds much higher than a OC bios. I tried 1100/1500 which shot to 760plus!!! then crashed to black :( Do you crash at 1100? For the night I put it back to 910/1375 and running stable at 640 with a 79temp now instead of 83 before at 1000/1375 OC bios. Going to mess with it more tomorrow so thank you for the confirmation that I am on the right track with going to TO. More trials to come..thanks again!

With the F62 bios already on my cards, my GPU/Memclocks are 1100/1500 and that's what I mine with. Any more or less on either GPU or Memclock and my hashrate drops significantly, like ~100kh/s drop! Currently they're both hovering a little over 770kh/s and temps are 70C/62C respectively as I type this. Rock solid for days now no issues with screen freeze or anything. Open rig was the key for me to keep the temps down.. well that and risers to get more air flowing around them both. Very pleased with the outcome considering the top card (when they were in a pc case on it's side and case open) was hitting above 100C easily while the bottom card was climbing slowly above 90C. These temps were unacceptable and I did not mine untill I had them in their current setup. Even when they hit 80C on a hot day (it's rather chilly outside atm so room is a few deg above that) I still cringe and worry about them while I'm at work. But I remote monitor their progress and so far so good... fingers crossed ;)

Thanks Joori! Right now I am running at a 700 stable but with a 83-85 temp on 925/1275 speeds with TC 8192. For somereason anything above a 1000 on the engine speeds seems to cause a black screen crash so working on that problem but at least right now I am stable at 700k. Truly wont be happy until that 730k is stable though..lol. Right now it runs for about 5 mins on a 1100/1500 speeds of TC 8192 getting 750kplus but then crashes for some reason reaching a temp of 85/86 still in comp case with side panel off. Next step will be to get some risers and pull them out of the case. Would love to see a pic of your unit if you ever get a moment. Seems to be though right now any GPU engine speed below 1000 seems to be my best friend without crashing.

Anyone have any other Cgminer configs working with a GPUengine of 1000 or less and getting 700plus khs? Btw is 85 too high of a temp to run on?  thanks guys!

im getting 700khash on my gigabyte 7950 (50 yes) on clocks of 1100/1250, you should try that :)

edit: f43 bios

Well with F62 if you set the engine at 1000 and memory at 1475, the voltage will drop to 1.2V - so will run significantly cooler and then the khs should be 700ish.

looks like i am running on a voltage locked card which has made things a bit tricky. Does anyone have success of flashing a Saphire BIOS onto a Gigabyte r797OC-3gd? Actually flashed it to the r9770TC-3gd the other night for that 1100/1500 default clock. Although everytime I go above a 1020/1040 gpu engine I go into a black screen crash so maybe I should flash back to the original 1000/1375 stock and go from there. At the moment I can run steady on a 925/1275 with TC8192 at 700 kh/s at 83 temp but would love to push it to 730-750 if possible :) Or does anyone have any lower speed ratios that work for a 7970 preferable with a 8-900 GPU engine? you guys are awesome! thank you

Quoting my previous post lol... Check out the first image. You really need to get them out of the case and into the open air. Particularly if the room they are in is not temperature controlled, i.e aircon and ambient temp in room is a little on the warm side... Just get yourself an el-cheapo shelf (mine in the image cost me 15 bux! from a bunnings/home depo type hardware store), some x1 or x16 risers and suspend those puppies above the board. The fan you see in the image is from a decommissioned Xigmatex CPU cooler. It feels like my 50w floor fan/box fan it pumps that much air but not nearly drawing as much power. I used to use the floor fan/box fan to cool these babies down when they were in my case, which was a Sharkoon T9 Value case on it's side with the side off and temps were what you're reporting atm (80ish-90C). The rack they're sitting on is just from an old fridge we have in the garage that does not work anymore, so I salvaged one of the racks from it and use that along with a couple of pieces of dowel to rest them on.

I tried to avoid all this shit to keep temps down but I had to bite the bullet and get enough air flow through them, especially since I wanted a constant 750+kh/s without the risk of cooking the cards. It paid off in the end. The biggest hurdle was attaining the risers... I had them on order already but couldn't wait for stock to arrive so I managed to get some sent locally aswell and was back up and running in a couple of days.

Then that is exactly what I am going to do especially with wanting to add a second 7970 into the mix here sometime very soon. How come you don't just keep everything else in the tower and just pull the GPU's out on risers like the following mockup with of course throwing a fan somewhere in the mix :

http://s7.postimg.org/n8kflnvyz/miningmockup.jpg

Also what would be the difference between getting x16 or x1 risers btw? sorry pretty noobish when it comes to this part but am a fast learner!! Feeling pretty stoked though on my constant 700 right now but still want that 730-750 to really put a smile on my face =D thanks for dealing with all my questions..really a big help and hopefully to others reading with 7970 issues.

Quite simply, because risers have a fixed length and the cards would only extend a few inches above the mobo anyway and the longer you make them, the less likely the cards will hash properly or even be detected by the mobo. I read somewhere on this forum that 30cm's is the limit to a PCI-E riser cable. Anymore and the resistance is too great and the card underperforms or fails to be detected. Some people have reported success in daisy chaining a couple together, tho personally my powered risers wouldn't allow the PC to boot if I daisy chained them (2 x risers together). My risers are about 18.5cm long each from tip to toe so going by the 30cm rule, it made sense that the cards failed to initialize correctly despite powering up. This and the fact I'd get ALOT more air flow if i had everything out of the constraints of the case with proper spacing.

As for the differences? Well, I'm no expert and without googling the actual answer I'd hazard a guess that it's just transfer rates and shouldn't impact mining speed whatsoever since it's the GPU's themselves that are doing the computations. There is actually a thread or two talking about this since there are a few people wondering how long you can make a riser cable. Maybe someone more knowledgeable in this area could chime in but for the most part, I'd already ordered x16 risers so I chose to stick with them for now. I still have another 2 x4 PCI-E slots available and 2 x1 slots on my mobo for future expansion should I decide to go that route. Having said this, I tried to throw in an old 5770 (flashed to a 6770) in one of the PCI-E x4 slots and both my 7970's hash rate dropped to ~500kh/s. I haven't investigated this any further as of yet but plan to see why this happened eventually.

As a side note, moving air cools and stays cool alot quicker than still air. So as long as you have some kind of air movement along with everything out of the case, then temps will be a non issue for the most part. Infact, take a look at the https://bitcointalk.org/index.php?topic=7216.0 (https://bitcointalk.org/index.php?topic=7216.0) thread. Lots of mining rigs there both open case, rack mounted or full tower setups. I go jelly when I view that thread :D

Very good points! Theoretically though if you had a shelf inches away you might be able to get away with a 12" Riser coming from the case but then again probably not with it already sunk inches in. So yes..here what your saying and pretty sure I am going to have to take apart an older computer to make that happen. Might not be able to put it back in if I ever wanted to ;)


Thanks for that link! huge help in seeing what everyone else is coming up with and pretty sure i am ready to make my home depot and frys trip soon. As for the 1x and 16x it looks like it really doesn't make too much of a difference from my readings due to amount of power/memory?something? not needed but testing will be a whole nother story as nothing is every as easy as it sounds. Luckily I only need 1 or 2 x16 as the 1x seems to come in handy when trying to connect more then 2 GPU's. I could be mistaken though. I have an old 5770 on my Mac Pro but couldnt get it above 50 kh/s no matter what I did. Instead it spits 160 mh/s for BTC which isnt much but can leave it on over night to gain 60 cents..ha!
So pretty happy just rolling with my steady 700 kh/s right now on a 925/1275 & tc8192 with temp 82-84 until I can bring it out of the case and ramp it up higher. On a 1045/1500 it shoots way past 750 kh/s now but temps creeping past 88/89 so I think I can live with 700 being in a metal heat box. Pretty sure if i keep it below 85 no damage will be done right? Thanks again for the advice..feels lovely to be collecting coins now..ahhhh

Haha yes it's a nice feeling when collecting coins considering the price of LTC just went up but so did the difficulty :P If you're planning on running 3 GPU's or more on risers, then you'll probably want to make one of the GPU's use a powered riser. You'll avoid burning out the mobo and possibly the cards in the process from all the power draw. 2 is fine tho, mine are on powered risers but I have not utilized the molex connector on them at this point in time and they seem to be doing great without them. When I do add another GPU I'll definitely be plugging one of the molex's in, the last thing I'd want is to ruin 900+ bucks worth of hardware over a silly power overload :o

700kh/s is a great rate to start off with, you'll be even happier once you get all your gear out into the open and are able to sail past 730kh/s with ease. If you're really keen, repaste the GPU Heatsink and you would probably squeeze a bit more out of the card. ;)

changed ratio to 1022/1244 and bam! running at a stable 725 kh/s with 82temp still in case!!! Going to still take it out as a 2nd GPU will be added soon and then it will be a whole new ball game in temp. but yeah..planning on getting powered and well molex im not even sure how to hook that up but that lesson will have to be learned another day. My brain needs a few days off ;) Thanks for your help and everyone elses! If anyone needs a little help on tuning a GIGABYTE 7970 give me a holla

The molex is connected to the riser, so as well as having your 6 and 8 pin PCI-E power plugs to the cards themselves, you plug another molex power plug from the PSU to the riser's molex connector. Easy peasy japaneasy :P

...I wouldn't worry about utilizing the molex's for 2 GPU's.. you should have more than enough power delivered from the mobo to the cards. Still get the powered risers for future proofing ;)

Glad it's all working out for you in the end man - take some rest and let your baby hash away for a while :)

Hi there!
I do.
Got the Gigabyte 797OC-3GD rev1, and doing only 530Khs with official BIOS, F3.
Would you mind sharing what BIOS did you settle on and what settings?
Thanks!

This is not true, with the F62 BIOS it will go down to 0.95v if you set --gpu-engine 700 in cgminer. At 701 it will be 1.2V and at 1001 it will be 1.25V

Hi,
where did you get the BIOS, and did the card come with a single or double digit BIOS?
I'm trying to get mine up from 530Khs, flashed around ~15 different BIOSes but either doesn't help or won't boot/load drivers/crashes on cgminer.

GV-R797OC-3GD

anyone wants to share a working .bat overclock and undervolt stable settings for claymore 10.0 ?

-cclock
-mclock
-cvddc
-mvddc

Especially, works undervolting ? Thanks.