8GB KIT (2 x 4GB) For IBM-Lenovo BladeCenter Series LS22 LS42 QS22. DIMM DDR2 ECC Registered PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 8GB KIT (2 x 4GB) DIMM DDR2 ECC Registered PC2-6400 800MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For IBM-Lenovo BladeCenter Series. (See Compatibility List Below)