Problems with 8800GT in Oblivion

[horvendile]

Hello. Not sure that this is the right forum, but I'll give it a try.

I just bought a Gigabyte GeForce 8800GT (512 Mb) to replace my Radeon X1900XT (likewise). I’ve only tested it in Oblivion, where it behaves nicely, with a very notable exception.

Whenever I go Chameleon or have an Oblivion gate in sight (which includes being occluded by a hill) the framerate slows to an absolute crawl. We’re talking low single digits, by the look of it. Unplayable.
It occurs both with and without AA.
Is this a known problem, with a known fix?

My system:
Athlon X2 4400+
Asus A8R32-MVP Deluxe Motherboard
3 Gb RAM
Vista 32-bit SP 1

 

[Neb]

Try changing the below setting in the oblivion.ini to 0.

bUseRefractionShader=0

 

[horvendile]

Well, what do you know. It solved the framerate problem, albeit at the cost of some cool looks. But at least the game is playable again until I can find a real fix. Thanks a lot!