SLI performance question

[Rroff]

IIRC monitoring VRAM use on ATI under vista/win7 64bit is somewhat problematic (nvidia too but its easier to work around). I have a little app that _can_ do it but it does so by brute force converting the data type and can only compensate for upto 3gig of VRAM, above that it becomes incorrect again.

 

[chaparral]

I also ran the counter strike source benchmark and the results were the same for 1 card or 2, but the work on each card was only 50% each.

SLI never used to work very well at all with counter strike
(But may of change now as that was with GPU drivers from years ago )

Try the lost coast benchmark

 

[arfur]

I've just spent the last 2 hrs testing various combinations and I cannot figure it out. my avg FPS on the boat demo is between 118 & 123 regardless if its on 1 card or 2, but afterburner shows gpu usage on both cards >59% if both cards are enabled. I disabled 1 card and removed the ribbon, re-run a quicker benchmark and the results came in the same as when I had 2 cards (tessmark). very wierd

however my single card with 1x / 16x 1920x1200 h/h/h/hbo def cpu got 120fps my mate who has same board and cpu @ 3.6ghz OC and a 570GTX only gets avg of 109FPS (ROFLMAO).

so even though its crap its better than his 570gtx

 

[M1k3H]

IIRC monitoring VRAM use on ATI under vista/win7 64bit is somewhat problematic (nvidia too but its easier to work around). I have a little app that _can_ do it but it does so by brute force converting the data type and can only compensate for upto 3gig of VRAM, above that it becomes incorrect again.

so me having only 1gb per card, I can utilise that application and have correct numbers?

 

[setter]

I've just spent the last 2 hrs testing various combinations and I cannot figure it out. my avg FPS on the boat demo is between 118 & 123 regardless if its on 1 card or 2, but afterburner shows gpu usage on both cards >59% if both cards are enabled. I disabled 1 card and removed the ribbon, re-run a quicker benchmark and the results came in the same as when I had 2 cards (tessmark). very wierd

however my single card with 1x / 16x 1920x1200 h/h/h/hbo def cpu got 120fps my mate who has same board and cpu @ 3.6ghz OC and a 570GTX only gets avg of 109FPS (ROFLMAO).

so even though its crap its better than his 570gtx

Try the heaven benchmark program.

http://unigine.com/download/

Run it at 1920x1200, no aa normal tessellation, also run it twice as on the first run your minimum fps are very low. Ill post up my stock sli results to compare.

My stock speed results

 

[arfur]

dx 11 / disabled/high/disabled/1x/off/fs/1920x120 - run 1 =FAIL wont run with/without SLI, is erroring.

 

[setter]

What sort of error are you getting?

 

[arfur]

http://ow.ly/i/7Izs
reinstalled driver and rebooted, also emailed ASUS for advice