Originally Posted by Kakaze
AV; right now there's some debate about MacPro RAM and whether or not it's safe to use 3rd party FB RAM in it.
The RAM is directly behind the air path of the processors so it's being "cooled" with already hot/warm air. Apple has special heatsinks on the RAM that're much larger than those that are available for other FB RAM. People have reported buffer correction errors appearing on third party ram with skimpier heat sinks.
Yep, I'm aware of all that... Buyers need to be aware of what RAM they're getting. Good quality FB-DIMMs aren't all that hard to come by for decent prices (newegg has some from Kingston), but without the proper heatsinks, they will indeed run too hot. Right now, Crucial is the only major memory brand I'm aware of that has Apple spec heatsinks on their FB-DIMM Mac Pro kits. Additionally, OTW, Memorytogo and Memory Express are all selling FB-DIMMs with "Apple compliant heat sinks". I don't have any experience personally, but all the complaints i have seen have been with Kingston, and Patriot RAM that is the proper FB memory, but with generic heat spreaders. Crucial originally offered Mac Pro memory kits and then they pulled them and actually recalled their FB-DIMMs if people bought them for the Mac Pro. They have now been shipping Mac Pro approved heatsinks on their FB-DIMM kits for about 2 weeks.
I personally don't plan on buying a Mac Pro until my G5 quads start to feel outdated. So I'm guessing I'll buy one sometime next year after the quad-core CPUs have arrived and the bugs worked out. If I had to buy now, I would probably buy the Crucial DIMMs. I wouldn't order from them direct - higher prices than from a mail-order vendor and I have to pay tax since they have facilities local to me. If I couldn't find a decent price, I may try the Memorytogo.com RAM. OTW's RAM is getting good reviews and has those kool red heatsinks, but I may as well order the RAM from Apple... OTW's price is only about 5% cheaper, if that.