32GB (8X4GB) Memory kit for APPLE MAC PRO 2006 1st Gen 1,1 DDR2 667MHz ECC FB-DIMM) 100% Compatibility Guaranteed. 32GB (4GB X8) DDR2 PC2-5300F 667MHz CL5 ECC REGISTERED 240 PIN DIMMS BRAND: HYNIX OR SAMSUNG--- the same manufacturers Apple uses in their Macbook Pros, Mac Pros, and iMacs HEATSINK:compatible for apple 1 YEAR WARRANTY FROM RETAIL-IT-BAYAREA