Review on Komputerbay 16GB (4X 4GB) DDR2 PC2-5300F 667MHz CL5 ECC Fully Buffered FB-DIMM (240 PIN) 16 GB with Heatspreaders for Apple Mac Computers by Aries Greene

Had the task of upgrading an old MacPro. Between that memory upgrade and the trick of allowing you to run newer versions of OSX that aren't officially supported, I have a nice machine to back up/test on. Edit: BTW, this memory won't make anyone's computers work. "hot". Apple requires that the DIMM chip that provides SPD data also has a temperature sensor. If this is not intended and the SMBus controller cannot read the temperature of the DIMM, it runs the fans at high speed as a precaution.