[Scrypt] Extremely low hashrate on Sapphire 7970 Vapor-X Ghz edition

[rayfloyd]

Hi everyone, I'm trying to mine litecoins with 2 of these cards. Problem is I get extremely low hashrate. I keep seeing threads with people deceived about their 7970 only doing 600 Kh/s. Well hear me out I only get 280 Kh/s per card...

What did I try?
-Flashed the BIOS to a "certified" 700 Kh/s+ BIOS (https://forum.litecoin.net/index.php/topic,2963.0.html)
-Have used many different cgminer configs
Here's my current one:

Code:

#!/bin/sh
export DISPLAY=:0
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
./cgminer --scrypt -o http://coinotron.com:3337 -u *** -p *** -w 256 -g 2 -I 13 --lookup-gap 2  --thread-concurrency 8192 --shaders 2048 --gpu-fan 100 --gpu-engine 1080 --gpu-memclock 1500

Using this instead doesn't work either:

Code:

#!/bin/sh
export DISPLAY=:0
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
./cgminer --scrypt -o http://coinotron.com:3337 -u *** -p *** -w 256 -g 2 -I 13 --lookup-gap 2  --thread-concurrency 8192 --shaders 2048 --gpu-fan 100

I'm running out of ideas and can't seem to find much about the problem. It's probably something in my set up but what?

Hardware:
-Rosewill Lightning 1300W
-Gigabyte F2A85X-UP4
-Some processor
-Corsair Vengeance Blue 8Gb
-Patriot Rage XT 16Gb as hard drive
-2x Sapphire Radeon 7970 Vapor-X Ghz Edition

I'm running Lubuntu. I have a similar rig with the only thing changed being instead of 2x7970 it has 3x5970 that hash at about 350Kh/s per core so each card is 700Kh/s

Any suggestion/advice/solution to this problem will be taken into consideration

[Walt Sobchak]

Try a thread concurrency of 24000 and eliminate the shader count flag.

[rayfloyd]

Try a thread concurrency of 24000 and eliminate the shader count flag.

Code:

[2013-07-31 01:04:04] Error -5: Enqueueing kernel onto command queue. (clEnqueu
eNDRangeKernel)
 [2013-07-31 01:04:04] GPU 1 failure, disabling!
 [2013-07-31 01:04:04] GPU 1 failure, disabling!
 [2013-07-31 01:04:04] Thread 3 being disabled
 [2013-07-31 01:04:04] Thread 2 being disabled
 [2013-07-31 01:04:04] Error -5: Enqueueing kernel onto command queue. (clEnqueu
eNDRangeKernel)
 [2013-07-31 01:04:04] GPU 0 failure, disabling!
 [2013-07-31 01:04:04] Thread 1 being disabled
 [2013-07-31 01:04:04] Thread 1 being re-enabledSegmentation fault (core dumped)

[krusin]

cgminer.exe --scrypt --intensity 13 --thread-concurrency 8192 --gpu-threads 2 --auto-fan --temp-target 75 --gpu-powertune 20 --gpu-engine 1035 --gpu-memclock 1500

^ My config for 710-720 with 3 7970 vapor-x cards, bios flashed with the same as you. Using cgminer 3.1.1.

Remove shaders, thread concurrency overrides it anyways. Keep TC at 8192, mine won't run at anything other than that either.
I started with my powertune setting maxed out, your results may vary. I take no responsibility for what happens...

Set your engine down to 900 or so to start, then boost your memclock by 25 every few minutes until it crashes, then back down by 25-50.

Now start on your engine through cgminer. Bump it up every few minutes by 25...when your hash stops increasing, stop, anything higher won't give you much better gains.

It took me about 2 hours of tweaking before mine were stable and hashing at a level I felt was acceptable, then I lowered them a touch for the summer season.

Read this for more ideas...
http://www.reddit.com/r/litecoinmining/comments/1ejz4w/2_ltc_to_whoever_can_help_me_fix_my_hash_rate/

[rayfloyd]

cgminer.exe --scrypt --intensity 13 --thread-concurrency 8192 --gpu-threads 2 --auto-fan --temp-target 75 --gpu-powertune 20 --gpu-engine 1035 --gpu-memclock 1500

^ My config for 710-720 with 3 7970 vapor-x cards, bios flashed with the same as you. Using cgminer 3.1.1.

Remove shaders, thread concurrency overrides it anyways. Keep TC at 8192, mine won't run at anything other than that either.
I started with my powertune setting maxed out, your results may vary. I take no responsibility for what happens...

Set your engine down to 900 or so to start, then boost your memclock by 25 every few minutes until it crashes, then back down by 25-50.

Now start on your engine through cgminer. Bump it up every few minutes by 25...when your hash stops increasing, stop, anything higher won't give you much better gains.

It took me about 2 hours of tweaking before mine were stable and hashing at a level I felt was acceptable, then I lowered them a touch for the summer season.

Read this for more ideas...
http://www.reddit.com/r/litecoinmining/comments/1ejz4w/2_ltc_to_whoever_can_help_me_fix_my_hash_rate/

With or without overclock the speed stays about the same =( It stays at 280 Kh/s which at this point ain't an overclock problem

[krusin]

Try it bare bones then maybe?
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe -o SERVER:PORT -u WORKER -p WORKERPASSWORD --scrypt --intensity 13

[rayfloyd]

Try it bare bones then maybe?
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe -o SERVER:PORT -u WORKER -p WORKERPASSWORD --scrypt --intensity 13

Ok so weird reaction now:

Code:

 [2013-07-31 02:42:30] Started cgminer 3.3.1
 [2013-07-31 02:42:30] Probing for an alive pool
 [2013-07-31 02:42:31] Pool 0 difficulty changed to 256
 [2013-07-31 02:42:31] Network diff set to 8.68M
 [2013-07-31 02:42:31] Stratum from pool 0 detected new block
 [2013-07-31 02:42:32] Error -5: Enqueueing kernel onto command queue. (clEnqueu
eNDRangeKernel)
 [2013-07-31 02:42:32] GPU 1 failure, disabling!
 [2013-07-31 02:42:32] Thread 1 being disabled

I think

Code:

[2013-07-31 02:42:32] Error -5: Enqueueing kernel onto command queue. (clEnqueu
eNDRangeKernel)

might be causing something somewhere. I'll try looking into that if google turn up anything

Also now GPU 0 mines at around 500Kh/s while GPU 1 is dead

Edit: Most people talking about the error say that there is not enough ram. However I've got 8GB

Here is `less /proc/meminfo` result

Code:

MemTotal:        8139204 kB
MemFree:         7281308 kB

[h2odysee]

I would try windows 8 instead of linux. I couldn't get my 7970s to perform under ubuntu as well as windows, but I don't remember their actual hash rates. I get 730-750 KH/s each in Windows 8.

[rayfloyd]

I would try windows 8 instead of linux. I couldn't get my 7970s to perform under ubuntu as well as windows, but I don't remember their actual hash rates. I get 730-750 KH/s each in Windows 8.

I had some difficulties setting up in windows 8 (usb), but I might have to retry.

[emunebtk]

At times I will have to restart the computer to see the 2nd GPU but that is usually when it crashes. I am using windows 7, with 13.6 catalyst beta 2 to get 770/khs on each 7970. I found that I eventually had to flash the BIOS on both cards to jump past 550. You may also want to try using -g 1  and definitely remove shaders as well as no need for lookup gap. Sometimes a 940/1275 clock ratio works well with 8192 TC. Also try 1040/1475 up to 1070 on the engine and then I finalized at 1100/1500 always using -I 13 to get 770. In the end though you may want to try a BIOS flash with another bios from the same GPU just different default clock speed. Probably one with a default of 1100/1500 would work and ideally a unlocked voltage would be nice.

[Walt Sobchak]

Did you test your power supply to make sure it is putting out the proper amount of power?

[rayfloyd]

Did you test your power supply to make sure it is putting out the proper amount of power?

Kill-A-Watt is displaying about 260W, but how do I test the power supply specifically? It's pretty much new too.

[Walt Sobchak]

Did you test your power supply to make sure it is putting out the proper amount of power?

Kill-A-Watt is displaying about 260W, but how do I test the power supply specifically? It's pretty much new too.

Try running cgminer with the settings above and the entire rig plugged in to the kill a watt. Check what the rig is pulling, and in cgminer see if your GPUs are actually at 100% activity in the GPU settings menu.

[rayfloyd]

Did you test your power supply to make sure it is putting out the proper amount of power?

Kill-A-Watt is displaying about 260W, but how do I test the power supply specifically? It's pretty much new too.

Try running cgminer with the settings above and the entire rig plugged in to the kill a watt. Check what the rig is pulling, and in cgminer see if your GPUs are actually at 100% activity in the GPU settings menu.

260W like I said, I'll have to check the gpu load though, any idea on how to check this under linux?

I'll probably backup my lubuntu install and try windows 8 again

[Thrash]

Do you have two threads running per card or just one? You need two threads with the 8192 concurrency or you will be running at half speed basically.

[rayfloyd]

Do you have two threads running per card or just one? You need two threads with the 8192 concurrency or you will be running at half speed basically.

Yeah I do

[Walt Sobchak]

Did you test your power supply to make sure it is putting out the proper amount of power?

Kill-A-Watt is displaying about 260W, but how do I test the power supply specifically? It's pretty much new too.

Try running cgminer with the settings above and the entire rig plugged in to the kill a watt. Check what the rig is pulling, and in cgminer see if your GPUs are actually at 100% activity in the GPU settings menu.

260W like I said, I'll have to check the gpu load though, any idea on how to check this under linux?

I'll probably backup my lubuntu install and try windows 8 again

If you hit "G" to see gpu settings while in cgminer it should show activity percent of whichever GPU number you select.