7970 Getting extremely low hashrates with scrypt algorithm

[dan7733]

Hi Guys!

So I have a Powercolor 7970 (Non-ghz edition, but custom powercolor cooler) which seems to work great mining BTC, with speeds of 630 MH/s (when OC'd to 1125 MHz core clock) (using GUIminer).
The problem is that if I try to hash a scrypt cryptocoin (LTC, BTB.. etc.), using GUIminer-scrypt alpha, I am stuck at 320 kh/s!
Obviously something is wrong... I've tried changing many settings... but can't get higher than this speed.
My thread-concurrency is 8192, intensity is 13, gpu threads is 2, worksize is 256, and vectors is 1.

Thanks a lot!

-Dan

[coingun]

Which OS are you running? I find the 7970's to be fairly hard to get stable. Try Win7 64bit if you can with the 13.4 ati drivers. This is what finally got me stable. You should be able to push 720 kh/s out of that single card stably. This would be with a TC of around 20480.

[dan7733]

Which OS are you running? I find the 7970's to be fairly hard to get stable. Try Win7 64bit if you can with the 13.4 ati drivers. This is what finally got me stable. You should be able to push 720 kh/s out of that single card stably. This would be with a TC of around 20480.

I'm running Win7 64bit, with 13.1 drivers.
I'll try a TC of 20480.
Should the other values stay the same?
Thanks!

[bobbix]

try this
make a .bat file and put the following in there

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1


cgminer.exe --scrypt -o "xxxurlxxx" -u "user" -p "pass" -I 13 -g 2 -w 256 -shaders 2048

make sure this .bat file is in the same folder as cgminer

run this bat file, you should be in the 650+ range

leave out thread concurrency and vectors

[FiiNALiZE]

Try making your engine clock 1003 and memclock 1609.

Set Powertune to about 5%.

I usually get around 720Kh/s with those settings.

[dan7733]

try this
make a .bat file and put the following in there

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1


cgminer.exe --scrypt -o "xxxurlxxx" -u "user" -p "pass" -I 13 -g 2 -w 256 -shaders 2048

make sure this .bat file is in the same folder as cgminer

run this bat file, you should be in the 650+ range

leave out thread concurrency and vectors

Hi,

I tried that...... and in cgminer I'm getting a consistent 23 kh/s!
Now I'm quite confused...

[dan7733]

Try making your engine clock 1003 and memclock 1609.

Set Powertune to about 5%.

I usually get around 720Kh/s with those settings.

Plot Twist: I changed the settings in afterburner to what you wrote, fired up GUIminer-scrypt alpha with a thread conc of 8192, clicked start mining, and the whole computer instantly shut down.

[coingun]

setx GPU_MAX_ALLOC_PERCENT "100"
setx GPU_USE_SYNC_OBJECTS "1"

C:\Users\miner\Desktop\cgminer\cgminer.exe -o stratum+tcp://stratum.give-me-ltc.com:3334 -u blah -p ltccoins --worksize 256 --lookup-gap 2 --gpu-engine 1100 --gpu-memclock 1500 --gpu-powertune 20 -g 2 --thread-concurrency 20480 --intensity 13

[Kaepora]

Hi Guys!

So I have a Powercolor 7970 (Non-ghz edition, but custom powercolor cooler) which seems to work great mining BTC, with speeds of 630 MH/s (when OC'd to 1125 MHz core clock) (using GUIminer).
The problem is that if I try to hash a scrypt cryptocoin (LTC, BTB.. etc.), using GUIminer-scrypt alpha, I am stuck at 320 kh/s!
Obviously something is wrong... I've tried changing many settings... but can't get higher than this speed.
My thread-concurrency is 8192, intensity is 13, gpu threads is 2, worksize is 256, and vectors is 1.

Thanks a lot!

-Dan

I had the same problem untill I lowered my core clock a bit and raised the memory clock on my 7950.
This is what fixed my problem:
I use shaders instead of thread concurrency on that particular card. Also make sure to watch out for HW errors. It should be HW:0 for zero errors or else you may be getting errors and just wasting electricity.
--shaders 1792 --intensity 13 --worksize 256 -g 2

Another thing to try is lower the core clock and raise the memory clock a bit and test it out I had to find a sweet spot. If I raised my memory clock too high my hash rate would go down so I lowered it until I hit a sweet spot.

[PalmerEdlrich]

setx GPU_MAX_ALLOC_PERCENT "100"
setx GPU_USE_SYNC_OBJECTS "1"

C:\Users\miner\Desktop\cgminer\cgminer.exe -o stratum+tcp://stratum.give-me-ltc.com:3334 -u blah -p ltccoins --worksize 256 --lookup-gap 2 --gpu-engine 1100 --gpu-memclock 1500 --gpu-powertune 20 -g 2 --thread-concurrency 20480 --intensity 13

That except you are better off running your gpu 1050 and don't be afraid to set I to say 17 or 18 .

[coingun]

Those cards like high memory clocks. Mine runs best at 1100 and 1500.

[talexeh]

Have you tried to use v12.8 driver instead?

[AZIZ1977]

Hi Guys!

So I have a Powercolor 7970 (Non-ghz edition, but custom powercolor cooler) which seems to work great mining BTC, with speeds of 630 MH/s (when OC'd to 1125 MHz core clock) (using GUIminer).
The problem is that if I try to hash a scrypt cryptocoin (LTC, BTB.. etc.), using GUIminer-scrypt alpha, I am stuck at 320 kh/s!
Obviously something is wrong... I've tried changing many settings... but can't get higher than this speed.
My thread-concurrency is 8192, intensity is 13, gpu threads is 2, worksize is 256, and vectors is 1.

Thanks a lot!

-Dan

why dont you try intensity 20. just to look what happens and use thread con. 20992.

[Justsumdude]

I get 680-690 with a 7950

[Pisoni]

Try to use a .json config instead use .bat

Then you can launch cgminer with --config filename.json

[smokeyrd]

I had similar issues...turned out to be a bad card after alot of troubleshooting. This is not to say the troubleshooting was worthless...definitely go through all the steps before you assume "its broke". Best of luck to you

[bitBG]

Hello, I have a similar problem. I got one 7970, it is working @ 925/1375 and makes round 500-560Mhps, I use trixx to OC it. I made it work @ 975/1375 and it is getting round 600Mhps.

A friend of mine has the same card, and he is getting it to work @ 1095/1375 and gets 640-666Mhps.

If I try to get my card over 1000 for the GPU and the drivers are crashing. My drivers are: 13.1

and all this @ 60-64C