I figured I would put this into one new thread to discuss the problems with mac pro ram. Looks like many places are starting to sell the ram but with differences. Take a look. My experience has been with a Mac Pro 2.66ghz and a Mac Pro 3ghz 8 core. I have purchased Transintl, Crucial, Kingston and ofcourse I have apple ram. Please share your experiences with your Mac Pro ram purchase so we can see a record of who has what types of modules, their return policy, how you were treated and what you paid. Thanks. OWC RAM: They Sell netlist brand and their own OWC brand. The netlist costs more. They say its because its certified vs their cheaper brand which is qualified. I say does it work or not. This difference in ram is confusing and doesn't make alot of sense. Are they saying its better to get netlist because it will work vs their cheaper brand that won't? Return Policy: Sure its all lifetime warranty but do they pay for return shippping? I have heard no. Transintl They have their own brand of Dimms. I have tested the 4gb kits, 3 of them and here are my findings. RAM: Non of the ram worked properly. They all showed up but caused numerous problems. First set caused computer to not reboot. Second set caused fans to ramp up to 4000rpm from sleep, third set seemed ok, fans did go up to 1400rpm though but here is the problem... none of the ram had heat sensors on the chips. I used a program called "iStat Pro". This program monitors the temp sensors in the ram. The transintl ram had no such sensor. Return Policy: Transintl will not pay for return shipping. As you can see I am out almost $45 in shipping charges in returns and original shipping. I have heard from others they did not receive their return shipping refund either. Newegg RAM: Newegg sells many brands of ram. The ram tested from them was the Kingston 2gb modules. These modules did not come with apple brand heatsinks. I did however purchase some ram heatsinks from them at the same time and applied them and the ram functions perfectly. Return Policy: Newegg will refund your shipping, but you must ask them to do so. Apple RAM: All the apple ram in my mac pros have temp sensors. This is needed to communicate with the mac pro for fan control. My apple ram has been flawless so far. Tested are 2 x 512mb sticks. I have not purchases ram seperately from Apple. Their ram is very expensive. That all said. My apple ram has Micron stickers on them which is Crucial ram. Crucial RAM: Their ram has been perfect. No problems with the 8gb of ram in 2gb sticks I have received. It runs cool, and has temp sensors. Return Policy: They pay for return shipping. I found this out 2yrs ago. Has this changed, or is it still the same. Please post your experiences with your ram.