Built this sorta sleeper pc with a dell dimension 2400 case and a dell optiplex 990 sff motherboard with a core i3 2100 and 12 gigs of ddr 3 : r/sleeperbattlestations
Auctions International - Auction: North Greenbush PD ITEM: (7) Dell Dimension computers without hard drives,(7) PS/2 computer mouse, and(7) PS/2 Dell keyboards
Dimension 2400, maximum ram - Dell Community
Amazon.com: Crucial 1GB Upgrade for a Dell Dimension 2400 Series System (DDR PC3200, Non-ECC,) : Electronics
1Gb (2X512Mb) Dimm Memory RAM Compatible with Dell Dimension 2400, 2400C, 240... By CMS C74 - Computer Memory Solutions
512MB Memory RAM Upgrade for The Dell Dimension 2350, 2400, 4550 (DDR-266, PC2100) at Amazon.com
My Dell Dimension by MichaelWayve - Intel Core i7-8700, Radeon R9 390 - PCPartPicker
Dell Dimension 2400 PCSTATS Review - Monitor and Accessories
Amazon.com: Crucial 1GB Upgrade for a Dell Dimension 2400 Series System (DDR PC3200, Non-ECC,) : Electronics