GeForce 6800 XT failure

[Dieselbrad]

Also, 2D may never see issues (desktop) while your 3D functions will.
This is normal for hardware failures as well.

First thing is first: Do you have issues in other 3D games?

If yes it may be hardware.. if no it is likely software, Half-Life 2 was developed mainly for the ATI hardware so, don't expect the Nvidia drivers to play nicely. As Joe suggessted a driver Rollback is often needed for Nvidia & ATI alike.

Valve likely has a recommended driver version, I would stick with that and also remember that the Loast Coast isn't a fully function game, but just a showcase of the features of "Source". So I wouldn't worry to much about it

I beat the Loast Coast in about 6min.. Episode One in about 3.5 hours.

You aren't missing too much.

[kosmiq]

Even if HL2 was mainly developed for ATI hardware it won't work on nVidia. I've been playing all HL games on my 7800GT without any problems ever.

If a developer would make sure the game only worked on one brand they would loose too much money you know...

Recommendation:
Test other games, see if problem exist there too
Roll back to driver version 84.xx or similar.

[IvanDowesa]

Sorry for @!

It's my failt, my motherboard is hybrid (agp + pci-e) and the pci-e runs 16x cards, but in pci-e 4x mode!

I changed my card for a with AGP interface, and it's working nice! ^^

Thanks, and sorry again! XD