www.crucial.com

select your board, they'll tell you if it's compatible. check out the speeds and stuff, adapt to your budget.
sweet huh?

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ASUS A7N8X-E Deluxe
AMD BARTON 2500+
GEIL 1GB DUAL-DDR400 PC3200
ATI RADEON X1600 PRO 256MB
WD 74GB RAPTOR 10,000RPM SATA150 HDD
MAXTOR 60GB ATA133 HDD
WINDOWS XP PRO