CORSAIR XMS2 4GB (2 x 2GB) DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model TWIN2X4096-6400C5

Pros: The Corsair memory goes on sale quite a bit, and sometimes the deals are so good you want to reach for your wallet. If you're someone who sticks to known memory brands like Crucial, yes, you can be safe with this memory. I've been using it for years in about four different computers, and so far no issues. But, just the same, I am not a gamer.

Cons: There's a bit more to memory than meets the eye. If you are a serious gamer you probably already know about memory timings. If not read about it on Wikipedia if you would like to know more. This RAM isn't state of the art in high speed. If you're in that ten percent who needs high end performance, you can find faster timings. If you're in the other 90 percent this memory is more than fine.

Overall Review: Break out the old mobo manual and check out a few things. First, how much memory can your MOBO hold? If it has the slots for this RAM, and yet only recognize 2GB, then 2 is all you'll get. The other thing is to be certain that your MOBO will appreciate duel channel DDR2 PC6400 memory. If you have a MOBO that specs a slower speed, you most likely can still use this memory, as it will step down.
The last thing is that I am a memory purist. I don't trust that the memory I buy six months from now will match this memory even if they are from the same manufacture. Therefore, when I buy memory, I fill up the board with memory bought at the same time. Thus, if you buy this memory and you ultimately want 8GB on your board, buy it all at once. Buy a second set of this memory.

Pros: Price was good but...

Cons: One of the two units I received did not work.

Overall Review: A dead unit of RAM causes a lot of aggrevation on a new build. Now my new Quad Core sets Idle waiting on the RMA process to run its course.