I tell u...8800Gt won't works well with pentiumD.....Change ur Processor First!!!!!! FIRST!!I mean it~~~~ 

PSU CM450W Real Power Enough for u...Even u OC also enough....

WHY PentiumD sark? This is my story...before i used E6850...i used PentiumD3.4GHZ....3Dmark06 result with my 2 8800GTS 320mb(OLD) SLI  Now u know what is the result with PentiumD3.4ghz>>Oc to 4GHZ is 7985  WTF...2 8800 320mb SLI resut only 7985.....SHIT man...then i change E6850....it aC2D 3ghz >>OC to3.4ghz result is 12453(8800GTS 320mb SLI)!!!!! U see the c2d and PentiumD diffrent????????Now i using 8800gts 512mb SLI result is 14945.......SO..1 Word PentiumD sark with Nvidia 8Series!!!!!

ya lu...Even i play World n Conflict in very high setting also cannot(That time is PentiumD with 2 8800GTS 320MB) Super lag~~~...Now i play World in Conflict in Very High Setting with DX10 Multiplayer 16 player also smooth smooth~~~~~