If you go with an RDRam board, like the ASUS P4PE, or P4T533 boards, and RDRam for the Intel, it will be slightly higher in price, but its to close to call performance wise.
If you go with a DDR board, like the Gigabyte GA-8PE667 Ultra, and DDRam for the Intel, then the Intel may actually be slightly less expensive than the Athlon system. However, the Athlon setup will have a slight edge, performance wise.
I would thus agree, that its a matter of what programs you would run on this system. If you're a hardcore gamer...the Athlon system...but if you do a lotta web surfing, with multitasking, then the Intel may suit you better.
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