im gettin low fps on my ati 9700 pro card!!!

[mrwolves]

I dunno why im get 30 fps on raven shield, and around that on mohaa too?? its weird on both games they jump from 70 fps to 30 , and it slows down very much when other players are the screen goes down to 8 fps !!! , my pc is good so i dunno why this is happening???

I have

Amd Althlon Xp processor 2600+ running at 2.1 ghz
ati 9700 pro 128mb card
512 DDR ram
120gb hd
win 98 sec i think

Please help me out im confussed!!!