At one time both were the same price. I guess not anymore.
However I still think that if someone had a lot of sdram that they did not want to get rid of and wanted to upgrade to a better processor, they should just get a P3 motherboard since a P4 can not be fully used with Sdram.
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Pentium 4 2.6, 2 Gig Corsair Dual Channel DDR400, Intel 875PBZ, Sapphire Radeon 9800 Pro, Soundblaster Audigy2, 200 GB Seagate 8 MB buffer
Pelxtor PX-755SA DVD-R/RW, Aluminum-Black Raidmax Scorpio ATX PC Case
w/ 420 Watt P4/AMD Dual FanPower Supply, Samsung SyncMaster 957MB
Win Vista SP 1