can't get ultra shader setting in dirt

[delsinboy]

just wondering if anyone has got the same problem; i've got a geforce 8800gt that can run colin mcrae dirt (patched) at max resolution (1680 x 1050) and with all the settings at their highest, except the shader. when i put the shader to "ultra" it defaults itself back down to "high".
even if i turn the resolution and the other settings right down it still wont let me have the highest shader setting.
any thoughts?

[Sl4x0r]

Is it an ATi only, DX10.1 thing?

Also - just been reading about certain options needing a 512MB card - your 8800GT isn't 256MB is it?

[delsinboy]

no its 512mb

[marsey99]

not sure, i do have this game but it was on vista i installed it and i think it all maxxed out fine.

might be dx10 only?

[delsinboy]

no i got vista 32-bit

[delsinboy]

i've added my specs now in my signature!