When I first got my mac pro quad I got ram from crucial and it was full of ecc erros so I returned it and bough kingston dimms from newegg and they ran without error. Now I upgraded to a 8 core and bought some ram from TransIntl. Got 4gb worth. When they got here there were no ecc errors except my mac would not restart. Just hung there and the dvd drive clicked. I sent those back and got 8gb from them. Rational is that A. its cheap, B. if I have a problem I have a better chance of getting some good ones and C. I was going to get more anyway. Well ram arrived after I had to pay to ship back. NOT COOL. 4gb out of the 8gb is bad. JEEZ. Now this ram makes my fans spin up to 4000rpm when returning from sleep. The other 4gb is fine but guess what. Heatsinks were different than the first 4gb. I looked on newegg and sure enough, its Wintech ram. Hmmm. So moral of this story is that A. Ram can be bad without showing errors or death screen. B. Transintl ships all different brands of memory. C. Restart issues are a major problem with bad ram. Going to order crucial this time since now they have official apple heatsinks and see how that plays out. If they ever get in freakin stock though. I wish there was a better vendor for this stuff.