problem with my hd7950

[Equate]

first of all, thanks for your help

@darksoft: sadly, nothing change

@st4nl3y: i have 4gb dd2 1066mhz

@Wilhelm:

i tried different value of thread-concurreny. Value greater than 8192 causes hw error, and values lower than 8192 causes hw error

Where can i find my shaders value? i found this link http://www.game-debate.com/gpu/index.php?gid=1588&gid2=890&compare=radeon-hd-7950-sapphire-3gb-boost-edition-vs-geforce-gt-640-144-shaders. 1164.8 is correct? how can i put it in cgminer string?

i knew that if i overclock my video card, i need to overvolt, not to undervolt...are you sure is safe?

if you overclock your card it need more voltage, undervolt will  make the card crash.

[P1tBull]

first of all, thanks for your help

@darksoft: sadly, nothing change

@st4nl3y: i have 4gb dd2 1066mhz

@Wilhelm:

i tried different value of thread-concurreny. Value greater than 8192 causes hw error, and values lower than 8192 causes hw error

Where can i find my shaders value? i found this link http://www.game-debate.com/gpu/index.php?gid=1588&gid2=890&compare=radeon-hd-7950-sapphire-3gb-boost-edition-vs-geforce-gt-640-144-shaders. 1164.8 is correct? how can i put it in cgminer string?

i knew that if i overclock my video card, i need to overvolt, not to undervolt...are you sure is safe?

if you overclock your card it need more voltage, undervolt will  make the card crash.

Actually no, some cards can be overclocked and undervolted. I am running 3x7950 at 1050/1500 MHz , undervolted to 1.05V/1V/1V and getting 650KHS per card.. Depends on the card and ASIC quality really.
But , yes, the card will crash if you undervolt beyond a point.

[asdlolciterquit]

Have you downloaded AMD App SDK ? Which version ?

yes, i downloaded it when i downloaded catalyst 13.9. I don't remeber the version...one of the last, i suppose..

[itf991]

I use bfgminer-3.6.0-win64 and this is my scrypt:

bfgminer --scrypt  -o stratum+tcp://xxxxxxxx -u y -p z --intensity 17 --worksize 256 -g 1

When I am away from keyboard I put intensity up to 20

I=17 550Kh/s
I=20 650-670Kh/s

No HW error.

Try this out. Any other miners are not working as good as this one.

[asdlolciterquit]

Do you have a link for 3.6.0 win 64 version?

i tried 3.9.0 and it didn't recognize my videocard, and 3.2.6 version but i see non difference with cgminer..

[P1tBull]

Have you downloaded AMD App SDK ? Which version ?

yes, i downloaded it when i downloaded catalyst 13.9. I don't remeber the version...one of the last, i suppose..

Make sure you have installed the latest SDK. It is very important for mining. Your SDK version actually affects hashrate more than the drivers. In your Add/Remove Programs, you should see both Catalyst and SDK.
If you want to try a clean install , this link here can help you out with setting up your miner.
This link will help you understand how to overclock and optimize your rig.

I was getting about 575KHS per card with no overclocking at all and I haven't seen HW errors ever.

[itf991]

Do you have a link for 3.6.0 win 64 version?

i tried 3.9.0 and it didn't recognize my videocard, and 3.2.6 version but i see non difference with cgminer..

Unfortunately, there is no link available any longer. I got this from bfgminer.org a while ago

[asdlolciterquit]

Have you downloaded AMD App SDK ? Which version ?

yes, i downloaded it when i downloaded catalyst 13.9. I don't remeber the version...one of the last, i suppose..

Make sure you have installed the latest SDK. It is very important for mining. Your SDK version actually affects hashrate more than the drivers. In your Add/Remove Programs, you should see both Catalyst and SDK.
If you want to try a clean install , this link here can help you out with setting up your miner.
This link will help you understand how to overclock and optimize your rig.

I was getting about 575KHS per card with no overclocking at all and I haven't seen HW errors ever.

i'm sure i have istalled SDK with the driver, but in may Add/Remove Programs i see only AMD catalyst install manager... 

P.S: thx for the links, very interesting!

[st4nl3y]

Like I said before adjust your TC and I to find the best value with no HW errors. Try this for example:

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -o stratum+tcp://global.wemineltc.com:3334 -u xxx -p xxx --thread-concurrency 16000 --lookup-gap 0 --gpu-engine 1120 --gpu-memclock 1500 --gpu-powertune 20 -w 256 -I 18 -g 1

[LiteMine]

first of all, thanks for your help

@darksoft: sadly, nothing change

@st4nl3y: i have 4gb dd2 1066mhz

@Wilhelm:

i tried different value of thread-concurreny. Value greater than 8192 causes hw error, and values lower than 8192 causes hw error

Where can i find my shaders value? i found this link http://www.game-debate.com/gpu/index.php?gid=1588&gid2=890&compare=radeon-hd-7950-sapphire-3gb-boost-edition-vs-geforce-gt-640-144-shaders. 1164.8 is correct? how can i put it in cgminer string?

i knew that if i overclock my video card, i need to overvolt, not to undervolt...are you sure is safe?

You have 1792 shaders - GPU-Z will tell all. Try an even multiple of that, so 7168, 10752, etc. with -g 1 for 7950's. The wrong thread concurrency will throw HW errors nonstop. I recommend 7168 since it looks like you don't have much RAM.

[asdlolciterquit]

first of all, thanks for your help

@darksoft: sadly, nothing change

@st4nl3y: i have 4gb dd2 1066mhz

@Wilhelm:

i tried different value of thread-concurreny. Value greater than 8192 causes hw error, and values lower than 8192 causes hw error

Where can i find my shaders value? i found this link http://www.game-debate.com/gpu/index.php?gid=1588&gid2=890&compare=radeon-hd-7950-sapphire-3gb-boost-edition-vs-geforce-gt-640-144-shaders. 1164.8 is correct? how can i put it in cgminer string?

i knew that if i overclock my video card, i need to overvolt, not to undervolt...are you sure is safe?

You have 1792 shaders - GPU-Z will tell all. Try an even multiple of that, so 7168, 10752, etc. with -g 1 for 7950's. The wrong thread concurrency will throw HW errors nonstop. I recommend 7168 since it looks like you don't have much RAM.

thanks, and thanks @ for the replies

I try different values of TC, and the ones who works better are 7168 and 8192. With -g 1 hashrate get lower, i don't know why. In any case intensity CAN'T get highter than 13.

Here what i tried:
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 8192  -I 13       works fine
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 7168  -I 13       works fine
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 8192  -I 13  -g 1     lower hashrate
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 7168  -I 13  -g 1     lower hashrate
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 10752 -I 13    thread concurrency too high, cgminer error.
Any of this string with I = 14, too many HW error

I will try later with  --lookup-gap 0,  --gpu-powertune 20 and -w 256 adn see what happen

[asdlolciterquit]

first of all, thanks for your help

@darksoft: sadly, nothing change

@st4nl3y: i have 4gb dd2 1066mhz

@Wilhelm:

i tried different value of thread-concurreny. Value greater than 8192 causes hw error, and values lower than 8192 causes hw error

Where can i find my shaders value? i found this link http://www.game-debate.com/gpu/index.php?gid=1588&gid2=890&compare=radeon-hd-7950-sapphire-3gb-boost-edition-vs-geforce-gt-640-144-shaders. 1164.8 is correct? how can i put it in cgminer string?

i knew that if i overclock my video card, i need to overvolt, not to undervolt...are you sure is safe?

You have 1792 shaders - GPU-Z will tell all. Try an even multiple of that, so 7168, 10752, etc. with -g 1 for 7950's. The wrong thread concurrency will throw HW errors nonstop. I recommend 7168 since it looks like you don't have much RAM.

thanks, and thanks @ for the replies

I try different values of TC, and the ones who works better are 7168 and 8192. With -g 1 hashrate get lower, i don't know why. In any case intensity CAN'T get highter than 13.

Here what i tried:
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 8192  -I 13       works fine
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 7168  -I 13       works fine
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 8192  -I 13  -g 1     lower hashrate
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 7168  -I 13  -g 1     lower hashrate
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  --gpu-threads 2 --thread-concurrency 10752 -I 13    thread concurrency too high, cgminer error.
Any of this string with I = 14, too many HW error

I will try later with  --lookup-gap 0,  --gpu-powertune 20 and -w 256 adn see what happen

it seems that nothing change

i don't know what to do

[P1tBull]

IMHO, I personally think something is off with your drivers. You haven't got something correct in the OS/drivers.
If your hardware is working fine at I=13, it should work fine at I=20.

Did you by any chance have an Nvidia card on the system before this ? Are those drivers still on the system?

Edit : Can you do a fresh Windows install ?

[darksoft]

Get rid of this line:

--gpu-threads 2

[asdlolciterquit]

IMHO, I personally think something is off with your drivers. You haven't got something correct in the OS/drivers.
If your hardware is working fine at I=13, it should work fine at I=20.

Did you by any chance have an Nvidia card on the system before this ? Are those drivers still on the system?

Edit : Can you do a fresh Windows install ?

I don't know what to say...before this driver videocard i had an ATI hd4870... and when i have uploaded the driver i removed the old one also whit driver sweeper...

a fresh Windows istall for now it's impossibile


@darksoft: if i remove that line, hashrate decrease...

[darksoft]

IMHO, I personally think something is off with your drivers. You haven't got something correct in the OS/drivers.
If your hardware is working fine at I=13, it should work fine at I=20.

Did you by any chance have an Nvidia card on the system before this ? Are those drivers still on the system?

Edit : Can you do a fresh Windows install ?

I don't know what to say...before this driver videocard i had an ATI hd4870... and when i have uploaded the driver i removed the old one also whit driver sweeper...

a fresh Windows istall for now it's impossibile


@darksoft: if i remove that line, hashrate decrease...

Remove that line and increase your intensity

[asdlolciterquit]

IMHO, I personally think something is off with your drivers. You haven't got something correct in the OS/drivers.
If your hardware is working fine at I=13, it should work fine at I=20.

Did you by any chance have an Nvidia card on the system before this ? Are those drivers still on the system?

Edit : Can you do a fresh Windows install ?

I don't know what to say...before this driver videocard i had an ATI hd4870... and when i have uploaded the driver i removed the old one also whit driver sweeper...

a fresh Windows istall for now it's impossibile


@darksoft: if i remove that line, hashrate decrease...

Remove that line and increase your intensity

i did it...i had hw error, even with 14 of I

[darksoft]

Use this and tell me what you get:

setx GPU_MAX_ALLOC_PERCENT 100
cgminer.exe --scrypt -o stratum+tcp://stratum.coinium.org:3336  -g 1 --thread-concurrency 22400  -I 20 

[compile]

Have you downloaded AMD App SDK ? Which version ?

yes, i downloaded it when i downloaded catalyst 13.9. I don't remeber the version...one of the last, i suppose..

Make sure you have installed the latest SDK. It is very important for mining. Your SDK version actually affects hashrate more than the drivers. In your Add/Remove Programs, you should see both Catalyst and SDK.
If you want to try a clean install , this link here can help you out with setting up your miner.
This link will help you understand how to overclock and optimize your rig.

I was getting about 575KHS per card with no overclocking at all and I haven't seen HW errors ever.

You don't need the SDK as cgminer has opencl built into it.

Running 640khs avg with these settings using the latest CCC drivers.

Thread-concurency 22400
Gpu-core 1079
Gpu-mem 1250
Voltage in Afterburner 1.019
Intensity 19

Really don't need to set anything else in the config.

[efx]

Don't play with the lookup gap, it's not a variable that you're supposed to mess with.

You don't seem to be trying enough variations of thread concurrency.


Only run one GPU thread with your 7950, otherwise you will always have hardware errors above 13 intensity.

cgminer doesn't 'come with opencl', it compiles kernels that speak the language of opencl. OpenCL is part of the standard AMD drivers (APP specifically) and has been for a good while now. You normally only need the SDK for development or kernel analysis.