CMS 4GB (2X2GB) DDR2 5300 667MHZ ECC Fully BUFFERED DIMM Memory Ram Upgrade Compatible with Apple® Mac Pro Eight Core 3.0 (2,1) Tower Ddr2 for Server Only - B55

2pcs of 2GB PC2-5300, DDR2-667 ECC Fully Buffered DIMM. Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS Apple Mac Pro "Eight Core" 3.0 (2,1) Maximum Memory64GB with two memory cards (16GB per memory card) Memory Slots8 Slots (4 (2 banks of 2) per memory card) Install in pairs