4GB KIT (4 x 1GB) For Biostar TForce Series 4 U 6100-939 TForce4 TForce4 SLI TForce4 U TForce4 U SE. 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 Biostar TForce Series. (See Compatibility List Below)