Did you change it in the .conf file rather than trying to add it to the command line?

Hmmm, surely you can set -g1 for one card and -g2 for the other..?

Urrrm.. You can clearly see the versions i'm using in the picture... and MSI is MSI Afterburner...

Yeah i can get 740Kh/s with much lower settings - As i say i'm not sure if it's worth the extra wattage, but i'm just showing it can be done relatively easily, and with decent heat. Once i get the wattage meter i'll work out whether it is in fact worth doing and update.

For anyone interested, i managed to get 800Kh/s stable (so far anyway), made a thread with details here: https://bitcointalk.org/index.php?topic=202909.msg2121006#msg2121006

**EDIT - I do not think these settings are stable, after about ten hours GPU 0 reports as "DEAD" - Thus I wouldn't recommend using them. I will try and sort the problem when i get a chance and update.**

So i managed to get my 7970 up to 800Kh/s, stable so far, and thought i would share.

I'm not sure if the extra Kh/s is worth the extra wattage - i am going to order an electricity meter so i can find out what it draws and i'll update once i have.

If you have a Vapor-x 7970, and haven't yet flashed the BIOS - Check my other thread out first:

https://bitcointalk.org/index.php?topic=200777.msg2095364#msg2095364

GPU Voltage        1187mV
GPU Clock           1135Mhz
Memory Voltage   1600mV
Memory Clock      1840Mhz

Fans Auto

cgminer --scrypt -o yourpool -u username -p password -s 2 --expiry 1 --queue 0 --thread-concurrency 20992 -I 13 -w 256 -g 2

Screenshot:



The reason my other 7970 is running at 720Kh/s is due to the fact its airflow is restricted by the first card and therefore gets too hot for my personal taste. I have a PCI-e riser in the post to fix this.

Hi,

So just to check, when you start cgminer, does it only come up with one device, i.e device zero?

So i managed to get up to 800 Kh/s on the 1st card, although i've only just noticed a few hardware errors, it's been running a fair few hours.

I'm gonna tweak it tomorrow, i'll post the results. Gotta sleep now.

I was wondering if someone may be able to help me.

So my current hashrate on cgminer is stable at 780Kh/s. The average hashrate, which if i'm correct is the one next to it, is much lower and jumps about a bit.. e.g 780K/757Kh/s

It's really bugging me as it makes no sense, surely it should be the other way round?

He should be able to get way over 600 even if it's not a black edition.

What did you manage to get out your vapor-x btw? I got mine to 740, i could push a bit more out of it, but i'm really enjoying these 60C temps, and any memory over volting seems to send my temps rocketing.

If it's crashing it's probably down to thread concurrency - Have a look for the thread concurrency others have been using for your card.


Yeah that low hashrate is a bit strange.

Play around with your GPU clock speeds, set it even lower, then keep going up and hashrate should increase, then suddenly decrease. When it decrease just keep backing up 1Mhz at a time and you should find the sweet spot.

You should also decrease your core voltage, try 1100mV, it will get temps down (i know they are already low, but they will go up when your hashrate increases).

Setting max gpu is needed everytime you restart your PC, but not every time you restart cgminer.

Also make sure the page file thingy has been set correctly on your PC - i was having loads of problems till i realised it was set to 0 - so i changed it to the max permitable of my main HDD and all was good

Edit - also try varying the value of  -s  --expiry  --thread-concurrency, see if that helps. You could also try higher intensities but i don't think that will be the issue. Don't forget though, if you go for a high intesnity, you will probably need to use -g 1 rather than 2

Ah yes, good ol' trollbox

I actually like that thing, met some nice people

Ignore this forgot i already posted

I recommend you use MSI afterburner version 2.2.2 to change settings, catalyst doesn't allow you to adjust voltage AFAIK.

Have a play about with the CGminer settings you use, try the ones i posted in my other thread or a couple replies ago in this one (not the GPU settings, the ones i posted were optimized for scrypt, with SHA you are going to want a higher GPU clock).

Wish i had of saved my settings for BTC mining, had them written down but lost them, so i can't remember what was optimal lol.

It's really easy to begin mining scrypt if that's what you decide to do btw.

Cheers Bud

In my experience you can get pretty much the same hash rate with a thread concurrency of 8192 as you can with a higher one, but then all the other settings need adjusting.

As long as you are careful, i wouldn't worry too much about damaging your card through changing the voltage.

I am finding that many cards have a stock voltage way higher than needed - for example the stock voltage on my vapor-x is 1.256V, and that produces way too much heat.

I think mine were 80+ before i downed the voltages. Now the first card is 60C fans 50% and the second card is 70C fans 70% - I have a pci riser card in the mail though, so that should get both temps down to 60C which is more than optimal imo.

Download MSI afterburner 2.2.2 and have a look at the voltage. If it's 1.2V+ you could definitely lower it a bit which should noticeably reduce heat. It depends on your clock speed and card obviously, but i find a nice 40-60mV gap between clock speed and voltage give nice stability - i.e 1040 GPU speed, 1080mV Voltage.

Let me know how it goes

Well i've been referring to scrypt mining i.e LTC - So if you got 700Mh/s SHA-256, you should get 700Kh/s scrypt, if you get what i mean.

Sorry i read what you said as Kh/s.

As for mining SHA.. hmm well i found SHA got hotter than scrypt, but you should be able to get 700Mh/s with that card and still have lower temps.

I can't remember how i optimized back when i was mining BTC, but i can try and help you.

What are you current settings for GPU/Memory clocks and voltages (the stocks if that's what your using) and cgminer settings for each card?

I reckon the voltage is probably way too high at stock just like with the Sapphire.

What model do you have?

What are the voltages?

The sapphire vapor-x ghx comes at 1.256V which is way way more than you need. With a simple undervoltage temps go right down.

Is your second card directly next to the 1st card? If so, then it will rub hotter due to restricted airflow.

My first card runs 60C @ 50% fans, the second runs 70C at 70% fans, but i have a PCI-e riser in the mail to fix that.

Well you should be able to get at least 700Kh/s with that card.

What voltage are you running? That temp seems a bit high for only 600 Kh/s

I had loads of problems with -I over 13, but when i switched to -I13 and -g2 it sorted everything out.

No worries, let me know what you get with those I and g settings

The voltage is already unlocked on the Sapphire vapor-x ghz 7970's - All you need to do is use MSI afterburner 2.2.2 or Trixx.

I've written a tutorial on how to flash the BIOS / get your speeds up to 700Kh/s+ - https://bitcointalk.org/index.php?topic=200777.0

Hmmm, so your saying the button does not change the BIOS?

I was almost certain that my card has two BIOS, and yeah switching them just increases clock speeds a bit.. but there definitely are two.. i think