I just installed the 9800gx2 - here's the problem I'm facing.

I normally run my multiboxers (2-3) in 2-3 separate windowed modes. However with this new card; running in anything but full screen mode is hell. Major lag, the time it takes to alt-tab between is 30sec plus, and lags my entire system to hell (Listening to repeated bits in ventrilo ftl)

I was previously running a 9600gt that worked really well in this regard.

Specs below, any help is appreciated (btw i tried the newest drivers 175.19 and now running beta 175.90 - no difference)

AMD Phenom X4 9850 (2.51ghz)
Corsair ram 4 gigs (although windows is only reporting 2.5gig in properties.. hrm)(800mhz, PC2-6400, thought it was 1066 but i guess i was wrong)
Gigabyte GA-MA770-DS3
GeForce 9800 GX2 1GB 512-bit GDDR3 (Came OC'd at 675mhz/memory clock at 2100mhz)
700w psu

Thanks!