Pros: 4gb, runs at 1066, works with windows vista 64, with a P5Q Pro

Cons: Have to manually set it up on my motherboard, and little to no manual or directions, but that's why it was cheap, and that's why you use the internet.

Overall Review: Be sure to set the timing to 7-7-7-20 and have it run at 1066, and 2.0v in the BIOS. This is very easy and on most motherboards takes all of two seconds.