For those wondering where to buy their Mac Pro memory, just a quick thumbs-up for OWC. I have a 2008 Mac Pro that runs the 800Mhz FB-DIMMS and has a notorious fussiness about DIMM pairings. Recently a single DIMM failed; easy to diagnose - red LED lit on the riser. OWC swapped that without question and entirely at their expense. No more red LED, but my Mac wasn't recognizing that pair of DIMMs. No amount of swapping sticks around would get it recognize everything. Another call to OWC and they insisted on replacing all the DIMMs in this machine "to be sure". This is memory I bought a bit over 4 years ago now. Again all at their expense. Machine is back to full-function, with nothing more than a couple of phone calls required. No, I have no affiliation with OWC, but it sure is nice to see a company stand by their claims in a non-hassle manner, and they deserve to be recognized for that.