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Amazon.com: parts-quick 2GB 2 X 1GB PC2-5300F 667MHz 240 pin DDR2 SDRAM ECC Fully Buffered FB DIMM Server Memory Brand for Dell PowerEdge 1950 : Electronics
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2GB FULLY BUFFERED DDR2 PC2-5300 667MHz ECC (FB-DIMM) Memory Not for MacPro at Amazon.com
ATP's DDR4-3200 Industrial DIMMs: Up to 128GB @ 1.2V for AMD & Intel
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16GB Kit (4x4GB) DDR2 Fully Buffered PC2-6400 800MHz FBDIMM Memory RAM for 2008 Apple Mac Pro at Amazon.com
Understanding Fully Buffered DIMMs - Apple's Mac Pro: A Discussion of Specifications