Underperforming GTX 260

Just bought a shiny new XFX GTX 260 XXX edition and in WoW the fps is actually worse than my tired old 1950xt 256mg.

I've tried different drivers,restarting etc , havn't managed to find any aftermarker drivers for vista yet but can anybody explain that complete lack of any increased performance? If i turn the terrain distance above minimum my fps plumets to 20 and my sound craps out.

Could my problem be that its a PCIe 2.0 card but my p5b deluxe only supports PCIe 1.0?

My power supply is a Silverstone 500w with 18A on both 12v rail so the card is getting the 36A it needs, but I am also overclocking and running 3 hard drives could my power supply be holding me back?

could be psu sounds like when you ask the card to do more work it gets more unstable...or maybe you have some leftover ati drivers that are unremoved?

Sorry I thought I'd set up my stats in my sig,

E6400 2.1 @ 2.9GHZ
Asus P5B deluxe
XfX GTX 260 XXX edition
Silverstone ST50 500W power supply


as I said the 12v rails put out 18A but I can't seem to find anywhere whether it needs 36A on each rail or not

Im looking at upgrading this asap as I think u may well be right about it being the bottle neck

Going to check some other games out though

I guess we should look it up.

http://www.newegg.com/Product/Show [...] r%20Supply

This is the pic of the side of the ST50F. There are two 12V rails, each capable of 18A. There is no combined number however, so we have to guess. If the total can not exceed 500W, and the 3.3V and 5V can consume up to ~150w, then that leaves 350W for the 12V rails. This comes out to ~30A on the 12V rails combined. I have no idea how much power a 260 needs, so lets randomly pick one that has those specs listed in its newegg profile.

http://www.newegg.com/Product/Prod [...] 6814143139

As stated, the 260 does require a 500W PSU with 36A on the 12v rail, assuming a fully loaded system. Your overclocked 6400 probably uses less power then a QX9650, so you probably don't need the entire 36A. (although the 3 drives might put you back up there.)

Download speedfan and have it monitor your 12V rail. Load up a game, and play for 5 min. Alt tab out and look at your 12V rail. Does it dip down a lot? Did it hit 11.4V? If so, thats probably your problem.