I did a search for my answer and sofar zilch. I finally have all my parts to build but all I need is the memory. I tried looking everywhare but I can't seem to find the type I need. I have a P4 3.0 (800fsb) and an Intel D865Perl(k) mobo supports -4gb Specs on the mobo: The Desktop Board D865PERL has four DIMM sockets and supports the following memory features: * 2.5 V (only) 184-pin DDR SDRAM DIMMs with gold-plated contacts * Unbuffered, single-sided or double-sided DIMMs with the following restriction: Double-sided DIMMs with x16 organization are not supported * 4 GB maximum total system memory * Minimum total system memory: 64 MB * Non-ECC DIMMs * Serial Presence Detect * DDR400, DDR333, and DDR266 SDRAM DIMMs So for 2 Double Sided Ram, I guess I need? 512 MB DS 256 Mbit 32 M x 8/32 M x 8 16 Where can I get 1gb or 512mb of DDR400 what follows my mobo documentation?