Had to return - I ordered two pieces and they were not identical
I was buying these for a Dell server, and it had a very picky BIOS that refused to boot with this RAM when I put both in. There were visible, and apparently electrical differences between the two part I got.Return was easy, and I ended up ordering a matched pair direct from Crucial. That cost more, but it worked...
Crucial Technology CRUCIAL 4GB 240-pin Memory Upgrade review by J. Murphy can be read at Amazon.Com