Two 5970s with Very Different Hash Rates

[WhitePhantom]

Thank you in advance for stopping to look at my post.

I mine using Bitminter's Java client, and up until a few days ago, I used an AMD 5970, which was giving me about 745 MH/s at 825MHz.

Then I swapped it out for an XFX 5970 Black Edition.  The only reason I swapped is because the XFX has an Accelero Xtreme 5970 cooler installed, which is substantially quieter.

When running the XFX at 825MHz I only get about 670 MH/s.  So at the same clock speed as the AMD card, the XFX does about 75 MH/s less.

I'm running Win7 Pro x64 and using Catalyst 11.10 drivers.

Has anybody here seen this sort of hashing speed difference between two video cards of the same model clocked at the same speed?

Thanks,
WP

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[DeathAndTaxes]

make sure load is 99%.  Most AMD cards will kick in thermal throttling by cutting the load.  825MHz at 80% load for example is going to underperform 825 MHz @ 99% load.

[ZodiacDragon84]

how does one keep the load consistent at 99% through just the bitminter Java?

[Eveofwar]

Also would be good to know exactly what SDK version you're using.  I know you posted before that you might have changed the catalyst drivers.

[WhitePhantom]

make sure load is 99%.  Most AMD cards will kick in thermal throttling by cutting the load.  825MHz at 80% load for example is going to underperform 825 MHz @ 99% load.

DAT, thanks for the reply.  The load on both GPUs bounces between 96% and 98% with a temp of about 65C.  Strange that it's not 99% like the old card.  I guess I'd expect about 30 MH/s less than the old card at 96%.

how does one keep the load consistent at 99% through just the bitminter Java?

Good thought, ZD84.  Does anybody know if this is possible with Bitminter, or any miner, for that matter?

Also would be good to know exactly what SDK version you're using.  I know you posted before that you might have changed the catalyst drivers.

Eveofwar, thank you also for the reply.  I was able to verify that I was running 11.10 on my old card.  I am running 11.10 on the new one, as well.  Is that what you're referring to when you say SDK?

Thanks,
WP

[bravetheheat]

Eveofwar, thank you also for the reply.  I was able to verify that I was running 11.10 on my old card.  I am running 11.10 on the new one, as well.  Is that what you're referring to when you say SDK?

Thanks,
WP

I think Eveofwar was referring to the AMD APP (or Stream) SDK, whereas you provided the versions of your AMD Catalyst.

[WhitePhantom]

Also would be good to know exactly what SDK version you're using.  I know you posted before that you might have changed the catalyst drivers.

It looks like I'm using APP SDK 2.5.775.2.  I have no idea which version I was using with the other 5970.  Does anybody here know whether that version number indicates that I should change something?

Thanks,
WP

[WhitePhantom]

Eveofwar and bravetheheat, thank you for pushing me in the right direction.  I found the rest of the answer in a similar thread.

Any help? - 5970 not hitting ~700 mhash/s

I followed ssateneth's instructions in the second post to extract and install "ATIStreamSDK_dev.msi" from "ati-stream-sdk-v2.1-vista-win7-64.exe".  After rebooting, the two new GPUs showed up in BitMinter's list. Using those, I'm getting about 745 MH/s now.

Thanks again!
WP