New video card keeps on jerking in mcm2

I just bought a Geforce fx 5700 256mb and when I play Mcm2 the frames keep on jerking. I used to have a Ati radeon 9000 128mb and it wasn't doing that. Can anyboby tell me why it does that and what I can do to fix it.

Thanks.
 
make sure your drivers are up to date. and check your video settings, if they are similar to your radeon settings were
 
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