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Old 09-01-08, 11:28 PM   #53
gstanford
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

Quote:
Originally Posted by Neospy View Post
I had 7900GTX SLI rig with Asus A8N-SLI deluxe.

At first, the only things that bothered me was lack of Tripple Buffering and poor Vsync performance.

Then, with some driver updates, image in SLI AFR mode become yellow-ish (probably genlock problem, like most significant bit of blue channel occasionally drop 1->0) in 2560x1600 mode.

About the same time Nvidia drivers started to use high-resolution software timer, insted to hardware, to do a flip(). This introduced visible tearing in 2560x1600 in first 10-40 image lines when VSYNC ON.
This driver update aslo improved AFR Vsync performance alot (it was always worse than single card before).

With FW92.91 (1 month before 8800GTX release?) and later drivers SLI support just disappeared, and never came back.
Last working drivers: FW91.47. (I wonder if Asus used hacked Nforce4 Ultra chips instead of nf4sli?) End of story.
the G7x series, even in SLI really are not powerful enough to properly push a resolution like 2560x1600. I have my 7900GTX SLI rig on a 24" LCD (Benq G2400W) which has a max resolution of 1920 x 1200. If you read G71 reviews you will see performance drops off badly after this resolution (can't remember the actual reason, but there is one).

The FW 9x.xx series were just plain troublesome fullstop IMO. I had plenty of profile troubles back then, just about drove me mad. Fortunately the driver situation has improved greatly since then. I have a friend I sold an old 7900GT 512mb card to, he likes oblivion, I'm still quite shocked at how well that runs on his system with the latest few drivers compared to how it used to run for me early 2007 with SLI'd 7900GTX's.
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