16x r9 280x mining rig arrived today. big problems. help will get rewarded.

[tagbond]

Yes, I updated to 13.12 today, had problems with the beta before, but with 13.12 no problems. However, I still cannot get past 600 khs on my rig with 2 x 280x cards, 2GB RAM, 8GB USB running BAMT 1.2, on a Gigabyte Z87 mobo...I think it has to be the mobo or OS since exactly the same cards and settings running on another machine with a different mobo and Windows 8...and on that machine I get 750 no problems..

[Jsnow]

2 GPU per MB isn't really good, you can save money doing at least 3xGPU rigs.

However, I'm running 3x Sapphire R9 280x with this simple setup: --thread-concurrency 8192 -g 2 -w 256 -I 13

~720 Kh/s each
~60° each

PCIE risers are a must. With them you can separate the GPUs well and keep all of them at a lower temp.
The reason behind the high temp on one of your GPUs is the lack of risers, the one with the fans pointing to the air has a low temp, the other one with the fans pointing to the other GPU is getting higher temps.

[Sparkzor]

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -o   -u -p --thread-concurrency 8193 --lookup-gap 2 --gpu-engine 1027 --gpu-memclock 1500 --gpu-powertune 10 -w 256 -I 13 -g 2

This I have on my PowerColor R9 280x, I get around 710kH/s with it. 73c max gpu, 80~~ VRM1 @80% fan.
If it clocks down by itself you need to set --temp-target.

It's not always better to have high TC and high clock. Mine actually performs better at 950/1400 that at 1100/1700. A lot better.

You have to set the clock in your .bat file, start out with stock and you'll have around 700 on each card. Maybe more

Download HWInfo and watch your temps there, a lot of people forgets to look at VRM temp. If VRM temp is too high the GPU can throttle and underclock itself.

Oh yeah, and PowerColor is hotter than Sapphire if I remember correctly, so you should be below 70c with good airflow and the correct settings

[pengoau]

I don't know if this has already mentioned but if you have issues with it not exceeding 550khsec you most likely have video bios 15.041. The 15.041 bios interally clocks the card as the vrms run a high temp. The cards with 15.039 bios don't have this problem. Unfortunately sapphire says the temps are fine (100c+ is fine apparently O.O) and won't acknowledge or state they will resolve it. Futhermore flashing the bios to 15.039 results in the card not posting.

Also the latest driver installs app app sdk 2.8 with r9 cards having poor performance with it. After installing the video driver install 2.9 sdk.

[traumschiff]

DONT use autofan imho, spin them at 75-80% depending on the temperature and problem solved.

Edit: also even tho im running 2x 270x but im using --gpu-engine 1100 --gpu-memclock 1500 --thread-concurrency 20000 and -w 512 -I 19 --gpu-fan 80 -g2 and it works at the maximum I can get from the card without overheating.

[pengoau]

Yes, I updated to 13.12 today, had problems with the beta before, but with 13.12 no problems. However, I still cannot get past 600 khs on my rig with 2 x 280x cards, 2GB RAM, 8GB USB running BAMT 1.2, on a Gigabyte Z87 mobo...I think it has to be the mobo or OS since exactly the same cards and settings running on another machine with a different mobo and Windows 8...and on that machine I get 750 no problems..

Get an extra 6gb of ram, to bring your total system ram to 8gb.
You need as much system ram as you have for the gpus according to the scrypt-readme for cgminer if thats what you are using.

[sterob]

give me your teamview, and instant message nick (like steam, line or facebook)

[SpeedDemon13]

Your a big time baller...LOL....Wish I even had 4 to 6 of those GPU's at the moment....I'm mining on a budget with 2x HD 6970's and 2x HD 5870's...I had 2x other HD 5870's, but those died on me...

[6strings]

With my 280x rig (only 2) I am getting 720khash on each card.

1040/1500
-I 13,13 -g 2 --thread-concurrency 8192 --temp-target 75,75 --temp-overheat 82,82 --temp-cutoff 85,85 --gpu-powertune -20,-20


As for sweet spots, thats it ^^^. 2 different 280x. One gigabyte and one msi.
I found they were COOLER with the crossfire bridge attached and crossfire enabled. Otherwise they were both well into the 80s. Don't ask why. I don't get it either.

Now, that being said the card used for the main display will always be a good 15% hotter than the others.
Your temps look fine in the pic you posted. No worries there. Try the settings I listed to see if you can get better hash rates.

[tagbond]

@pengoau - already tried 8GB RAM, made no difference - but the video bios mentioned earlier I will have to look into...still trying to make sense why the same version of video drivers will give different results on windows and on linux...

[wobbzz]

Regarding your vapor-x's, take a look at this:

https://litecointalk.org/index.php?topic=10313.0

There are some known issues surrounding the Vapor-X with latest bios 015.041. Do you know which bios version you have? You can find it with GPU-Z if you're in Windows.

I have 6 of the MSI 280x Gaming OC cards achieving ~730+Kh/s with them using the following settings:

--lookup-gap 2 --thread-concurrency 8192 -g 2 -I 13 -w 256 --gpu-memclock 1500 --gpu-engine 1060 --gpu-powertune 0 --expiry 1 --scan-time 1 --queue 0 --auto-fan --temp-target 80

[Sparkzor]

DONT use autofan imho, spin them at 75-80% depending on the temperature and problem solved.

Edit: also even tho im running 2x 270x but im using --gpu-engine 1100 --gpu-memclock 1500 --thread-concurrency 20000 and -w 512 -I 19 --gpu-fan 80 -g2 and it works at the maximum I can get from the card without overheating.

MSI Afterburner and making your own graph for the fan is the best choice imho!

[Freekje]

setup

stats


and they can prbly push 10-15kh more but I like the low rejection rate ;]

add me on skype and ill gladly explain : freeekje

[pjviitas]

Best thread ever!
Buying 16 cards and have no clue about multi-GPU mining. 

Are you going to run only 2 cards per mainboard? That's a pretty waste.
4 or 5 would be good. But you'll need pcie risers and better psus.

+1 on best thread ever

[pengoau]

Stay away from all sapphires but the toxic editon (maybe), as I too have the bios throttling issue with my vaporx.

I think with the better cooling (heatsinks on the vrm vs just pads with the vapor) of the toxic edition and maybe a different bios it doesn't have the same problem of the vaporx.

[cryptmebro]

I'm no expert myself on 280x' but this guide here looks pretty in-depth and could help you out finding the right settings.

http://rumorscity.com/2013/12/14/radeon-r9-280x-litecoin-mining-and-sweet-spot-for-700khashsec/

If it helped a small tip is appreciated

LKsS2E9mVm3WTuqRK3zLvv6Lsjh9Cp9Hq7

How do I run -g 1 for my 7950 and 6950, and -g 2 for th 280x on the same system?  I though I had it configured with 3 separate .bat's (using -d 0 -d 1 etc...for each bat), but then my 280x kept crashing my computer when cgminer would load up.  I can't only get about 650kh and I've tried tons of different settings so far. 

[yorich]

3x 280x's:

Code:

{
"api-allow" : "W:127.0.0.1,192.168.0.26",
"api-listen" : true,
"api-mcast-port" : "4028",
"api-network" : true,
"api-port" : "4028",
"expiry" : "120",
"kernel-path" : "C:\\Program Files\\BFGMiner\\/share/bfgminer",
"log" : "5",
"no-submit-stale" : true,
"queue" : "3",
"scan-time" : "60",
"scrypt" : true,
"shares" : "0",
"auto-fan" : true,
"device" : "0-2",
"gpu-threads" : "2",
"gpu-dyninterval" : "7",
"gpu-engine" : "1050,1070,1070",
"gpu-fan" : "0-85,0-85,0-85",
"gpu-platform" : "0",
"gpu-memclock" : "1500,1500,1700",
"gpu-memdiff" : "0,0,0",
"gpu-powertune" : "0,0,0",
"gpu-vddc" : "0.000,0.000,0.000",
"intensity" : "13",
"temp-overheat" : "85",
"temp-hysteresis" : "3",
"vectors" : "1",
"worksize" : "256",
"lookup-gap" : "2",
"shaders" : "2048",
"thread-concurrency" : "10240",
"skip-security-checks" : "0",
"expiry-lp" : "3600",
"scan" : "opencl:auto",
"no-pool-disable" : true,
"no-show-processors" : true,
"no-show-procs" : true,
"no-unicode" : true
}

[ar88]

Stay away from all sapphires but the toxic editon (maybe), as I too have the bios throttling issue with my vaporx.

I think with the better cooling (heatsinks on the vrm vs just pads with the vapor) of the toxic edition and maybe a different bios it doesn't have the same problem of the vaporx.

is more of the vapor-x issue.. it's bios holding back, trying to keep temp at 70c..

sapphire 280x dual x is the bomb... 740-750kh/s easy..

[Vizakenjack]

so my 16 gpus arrived. im testing two currently
setup
2x Sapphire Vapor-X Radeon R9 280X
Gigabyte G1.Sniper
AMD A88X AMD A8 Series A8-6600K 4x 3.90GHz
900 Watt Inter-Tech Nitrox Nobility Modular
80+ 64GB SanDisk Solid State Disk 2.5"
win 8.1
amd 3.11 beta driver
amd sdk 2.9

Such setup. Much motherboards, very profit. Powerful CPU, such calculations.