4870 wierd graphics in-game?

I recently recieved my Sapphire HD 4870 1gb card for my new build.
I thought I would just give it a try in my old pc. Specs:

motherboard: 775Dual-VSTA
CPU: Intel Pentium 4 3ghz.
2gb ram
gpu: ati radeon 4870 1gb.
PSU: 400W'

I installed all the drivers that came with the card, and launched Warhammer Online (which ran fine with my old 8600GT)
For my big surprise I met alot of wierd graphics in the game, which of course concerned me.
here is some pics of how it looked:


By alexanderzig92

By alexanderzig92

I hope anyone could tell me why this is happening!

Alenxader.

Uninstall everything related to nvidia (ie drivers, control panels, etc) and reinstall the ati drivers

I'm gonna try uninstalling all Nvidia related software and reinstall ATi drivers as you said. Will write the result

the 400W isn't enough, you need at least 550W, it's also a P4 so the PSU is probably crappy.

Your GPU is being bottlenecked. Get a better CPU and have a blast.

His problem is not a CPU bottleneck - it's a driver issue most likely...he is playing Warhammer Online, not Crysis on very high.

Try turning anti aliasing off and changing the graphical settings