i know both these are older cpus.. well a couple weeks ago i bought a little system with an athlon 64 2.1 gig processor then today, a buddy gave me a system with a tyan s5350 motherboard, which has dual intel xeon 2.8 gig processors which should i use for my main system? it seems that the dual cpu motherboard with 2 2.8 gig processors would be like having a nearly 5 gig processor? clearly eclipsing the athlon 64 2.0 gig processor? or does it not exactly work that way and im thinking of it in the wrong way? thoughts are appreciated, i need to get a system built, so this will help me with my decision thanks!