righty.
Installed the 4.1 CATs... looking good... here's the important bit of the conf.ini file:
HardwareShaders=1
Shadows=2
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3
Sky=2
Forest=0
LandShading=3
LandDetails=1
LandGeom=2
TexLarge=1
TexLandQual=3
TexLandLarge=1
VideoSetupId=8
Water=0
ForceShaders1x=0
PolygonOffsetFactor=-0.0625
PolygonOffsetUnits=-1.0
Effects=1
with the added line as suggested above and AA x4, no AF - through flak from 4 cruisers and a carrier - nice n stable... and still v.pretty in perfect mode as you can see nice.
That's on a 9800pro with an XP2100+ & 1GB memory