HD4850 won't go 3D

Heya,

Upgraded my X1950XT to HD4850, and the card won't switch to 3D clocks when playing GTAIV, and say synthetic benchmarking like 3Dmark06. It works fine in Far Cry 2 - 3D clocks are used.

How can I force 3D clocks on this card?
ATITool don't seend to be working with it.


Thanks,
Alex


P.S.
Vista Ultimate 64bit

 

I'm not familiar with ATI cards but am I right in understanding your video card is running in 2d clock frequencies and you want it to run at 3d clock frequencies?

If so Rivatuner will enable you set your 2d clock frequencies equal to your 3d clock frequencies,a bit of a brute force workaround but better than nothing until you find a software solution I supposed.

Have you checked the games website for known 3d problem.

http://www.majorgeeks.com/download737.html

EDIT Duh! I don't think rivatuner wont work with vista 64 even though it says 'win all' sorry about that

 

Hmmm Guru3D says version 2.21 its compatible with vista 64 so may be worth a shot.