4GB KIT (4 x 1GB) For Asus P4 Motherboard Series P4C800 (Non-ECC) P4C800 Deluxe (Non-ECC) P4C800-E P4C800-E Deluxe (Non-ECC) P4G800-V P4G8X (Non-ECC) P4G8X Deluxe (Non-ECC) P4GD1 P4P800 P4P800 Deluxe P4P800 GD P4P800 SE P4P800-E Deluxe P4P800-MX P4P800-VM P4P800-X P4P8X P4R800-V P4R800-V Deluxe P4R800-VM P4S800D P4S800D-Deluxe P4S800D-E Deluxe P4S800D-X P4SD-LA P4SDX P4V800D-X. DIMM DDR NON-ECC PC3200 400MHz RAM Memory. Genuine A-Tech Brand. 4GB KIT (4 x 1GB) DIMM DDR NON-ECC PC3200 400MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Asus P4 Motherboard Series. (See Compatibility List Below)