it's not the CPU that you have to be concered about...........it's the GPU interface which I'm betting is AGP........... and therefor is not compatable with your P4 MotherBoard.... can't put a PCI-e card in a AGP slot
go here to see all the graphics cards http://www.techarp.com/article/Deskt...idia_4_big.png
I have a P4 with an AGP also at 3.06..I put an ATI HD3850 AGP card in....the best one available.......the next card down from that is the HD1950 and then the HD1650 and then X800.........
With the HD 3850 and 3g RAM, I can play BF2142, (on full) Fallout3 (on full) Crysis (on high, I have DX10 with this but lags on Ultra)...you get the picture
Win8.1/HAF X/CM 1000W/Z77X-UD5H/3770k/32g G Skill/GTX780/Vertex3 120g/WD 500 Blk/WD 1T Blk
Win7/CM Centurion/650W/Z77X-UD3H/2500k/16g Kingston/HD6870/Vertex2 90g/WD 500 Black
Win7/modded mid-case/725W/UP45-UD3R/Q6600/8g Kingston/HD6870/WD 1T Blk/WD 500 Blk
doesn't keep me up nights, no siree