Hi All,

Information for anyone running a Nvidia 7950GX2:

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The 'new' 93.71 WHQL drivers also have a bug in regards to clock speeds on the GX2 and possibly SLI systems in general...

For example, if I use 'coolbits' to overclock the memory of my GX2 it reports it as follows:

Core Clock 500MHz
Memory Clock 1400MHz

Now, if I check Everest Ultimate Edition's status of my GPU's one card is listed as 500MHz core and 702MHz (1404Mhz Effective) memory whilst the other GPU is reported to be 500MHz core and 600MHz (1200MHz Effective) memory.

I know one card is indeed running the memory slower than the other because if I perform several benchmarks (such as HL2: Lost Coast etc) with one GPU on 1200MHz memory and the other GPU on 1400MHz memory I get about 3-4 frames per second slower performance than with both cards memory set to 1400MHz (using RivaTuner to 'fix' the memory clock speed issue) and then verifying the speeds again in Everest.

However, as soon as I reboot the PC, Cool Bits (since being modded by Rivatuner) and 93.71 have an issue and the memory speed of both GPU's is only 300MHz (600MHz Effective) and performance takes a huge dive

So I have to go back into the Nvidia Control Panel and set the memory clocks back to 1400MHz manually, but of course I'm then back with one card on 1400MHz (Effective) memory speed and the other back on 1200MHz (effective) memory! And no, don't tell me the clocks are correct because if I run several different tests with one card's memory slower (1200MHz) than the other (1400MHz) the performance is consistently slower than with both cards running at 1400MHz.

At the end of the day I simply don't trust the 93.71 drivers and I know that RivaTuner does not work correctly with them, so for me it was back to 91.47 WHQL as at least I know they don't have any problems in regards to clock speeds/tweaking!

I really hope nvidia and/or Unwinder and his fantastric Rivatuner software sort this bug out soon... perhaps we need another driver release?

The good news is that my GX2 runs just fine on the 'old' 91.47 WHQL drivers, and I've kept the updated SLI profiles from 93.71 too.

Regards,

Greggy

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