I 4 box shamans.. wanna pvp arenas.
ok im looking at the 2 different CPU's which are hardly different, but by looking at them, dell has the i7 set higher up than the others.. So these are the 2 that I am looking at.

As far as RAM. I have 4GB that are DDR2.. thats all my computer can handle. What about upgrading to a 64 bit version of windows xp? i know that this would alow my computer to handle the full 4GB or RAM (instead of the 3GB). But ive heard upgrading slows ur computer down, so it outways it. As far as video cards go.. I have a couple that i could use. I have a Nvidia Geforce 7900 GS, and a Gforce 6 series. Also i have a Radeon ATI X800.
which one of these is better, and but how do i know if they are compatible with everything that i have? like my DDR2? will that need to be upgraded to DDR3? because of these new CPU's? or is that ok, and the motherboard?

I cant really upgrade my RAM or my motherboard, because i just did RAM, and motherboard is to much money for me ATM. Thanks for the help!

Intel® Core™ I7-920 Processor (2.66 GHz) Faster GHz= better preformance?

Core™ 2 Quad processor Q9550 (2.84 GHz)- With four processing cores, up to 12MB of shared L2 cache¹.. I am not sure what that means..

Thanks so much for the help!

Other specs-
Dell Dimension 8400
Intel(R) Pentium(R) 4 CPU 3.4 GHz
4GB of DRR3 gaming RAM
XP professional