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Very poor 3DMark06 SM2/SM3 performance with GTX 260 216 SP

Last response: in Graphics & Displays
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January 10, 2009 11:36:29 AM

My problem is very lousy Shader 2.0 and Shader 3.0 performance in 3DMark06 (v1.1.0).

Graphics card is Gainward 260 GTX 216 SP Limited Edition 894 MB.

RIG

E6750 @ 3.2GHz (also tried without OC, only real difference is CPU score, not Shader 2/3 score)
2x 1GB 4-4-4-12 800MHz DDR2 (800MHz without and with OC)
Antec NeoHE 550W

RESULTS

ForceWare 180.84 SM2.0:
4449 (stock clocks)
ForceWare 180.84 SM3.0: 4346 (stock clocks)

Best results I have reached are these.

I have also tried 181.20 drivers, which gave few hundred less points on both shader tests.

I tried 185.20 as well, but with those I couldn't even get to Windows XP login screen, since after "XP loading screen" there weren't any signal coming to my display.

...thing is, I had 4850 1GB OC (factory OC) which performed better.

What on earth is going on? I was expecting to see around 6000 points for shader tests.

Is it possible that GPU isn't getting power through both PCI-E 6-pin connectors or something? What would happen if only one of those was attached (although I have two, but if there's an issue)

Best result this far in overall 3DMark06 score is 10422 with E6750 @ 3.2GHz and GTX 260 (216 SP), which seems like approx 4k less than it should be.
January 10, 2009 12:15:12 PM

I managed to isolate the issue, but I don't know how to fix it! Please help me out! :bounce: 



My motherboard is Asus P5K. There aren't direct controls to PCI Express bus, only possibility is to lock it to 1x or then not. And it sure isn't locked to 1x.

I tried upping PCI Express from 100MHz to 105MHz. No help.

I also tried enabling PCI Express Spread Spectrum, no help.

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January 10, 2009 12:31:08 PM

After a quick search on the board it appears to be a crossfire one, and according to it's specs one of the PCI-E slots maxes out at 4x.

"2 x PCIe x16 (blue @ x16 mode, black @ x4 or x1 mode) supports CrossFire Technology"

try swapping it to the other slot and it should fix the issue
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January 10, 2009 1:12:27 PM

Aye, that did. Was just going to post that. :) 

SM 2.0 Score 6552
SM 3.0 Score 6937

Stock clocks. :) 
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!