Hey, I am just trying to get to the bottom of FPS issues in Skyrim I am suffering from (I have also posted this in the official NVIDIA forums), so any help would be much appreciated.

I get good performance in every game or application other than Skyrim, where I get an average of 10fps all the time - I have tried rebooting my PC, left it running for a few hours to say whether FPS improves and I have tried setting SLI_PREDEFINED_MODE_FORCE_SFR within NVIDIA inspector as suggested on the NVIDIA forums and it hasn't made any difference at all.

For your information, I am running Skyrim on ultra settings at 1920x1200 - 60Hz. V-Sync is currently on, though makes no difference to frame rates in Skyrim whether on or off.

My computer's specs are -

NVIDIA GeForce GTX 580 x2 (SLI enabled) - using Forceware 301.24. I have used the previous versions also without success.
Intel Core i7-2600k @ 4.7GHz stable
ASUS P8Z68 Deluxe M/B
G.Skill RipJaws 32GB RAM
Corsair HX1000W PSU

If you have any ideas as to how I can remedy this situation then please comment!

Cheers

Wish I could give a good answer. I have a very close match to your system. Not sure if this is pertinent or not, but I had the same PSU as you have. Got my second card and was testing Skyrim out and the PSU died. It was nearly five years old. Also I am using the 296.10 drivers, tried the 301.24 betas and had slowdowns with SLI enabled, usually 60 but it dropped down to 35 to 40 fps and was choppy. This was at 1920 by 1200. Now running 2560 by 1600 and still get 60 everywhere. You should be getting 60 also.

Very strange then. It seems to be something that happens to random installs. Perhaps time to wipe Skyrim and start afresh and play around I guess. Pretty sure it is a NVIDIA issue for me though as previously I had 2x Radeon 6870s CrossfireX and had no framerate issues then.

Thanks for your reply anyhow.

I get consistent frame rates between 50-60 fps everywhere. I have the same GTX 580's x2 SLI'd into a 2560x1600 pixel display. I run the latest WHQL driver. 12GB RAM in triple channel. The major difference is my PSU is 1300W. A 1000W PSU is a bit marginal when two 580s may want as much as 550-600W apiece, but that does not account for 10fps everywhere. Yet if that PSU is getting tired (as they do) you may need to try a new one, a higher rated one.

I am thinking that first a roll-back to the WHQL driver might be worth trying before getting too serious about hardware changes.

They are not stuck in 2d mode in the drivers are they?
Monitor them with MSI Afterburner or EVGA precision while in game to see what they are up too.

How does it run with just one card enabled? Might try that, still could be a borked driver install or a weakening PSU, hard to say. I haven't used one for years but you might try a driver cleaner app, might have some left over AMD stuff.