New 6800 Problems :(

[MoLt3h]

I just bought myself a new ASUS N6800/TD/512M Geforce 6800 512MB 128-bit GDDR2 AGP 4X/8X TVO DVI VGA to replace my 4200 256mb RAM AGP because I believed the 4200 had borked...however I'm still getting the same problems to some degree...

AoE3 although runs hell of a lot smoother still occasionaly flashs and leaves streaks of textures...

However the biggest problem is in CS:S...on the 4200 the game would load and then freeze with white blocks everywhere...the 4800 has shown some improvement, I can play a round before this happens:

I have the 91.31 Forceware drivers installed, no overclocking. System specs are as follows:

AMD Athlon 64 Processor 3200+ 2.01 Ghz
1.00 GB of RAM
Windows XP Service Pack 2

I have read the sticky on 4800s but I'm afriad to flash the bios incase I bork it completley...need some reassurance and clarification before I do that...

I'm tempted to believe that the AoE3 problem is due to my screen...however I don't think the CS:S one can be!?

Thanks in advance!

Edit: Extra info on card

 

[MoLt3h]

It's running at 66C on desktop and reaching a peak of 77C when running CS:S

Intresting though, was playing a different map to dust and I had no problems, yet when I changed to dust2 the graphic problem above reapperared...wondering if the new lighting thing they put in HL2 is causing problems...gonna go try turning it off now.

 

[MoLt3h]

Ok so i've just played a full game of dust 2 with the bloom and lighting effects turned off without a problem...leading me to conclude that bloom effects etc. are causing my graphics problems...

why is this? Can this be due to a dodgy moniter?