This is a 1GB Stick, it was a part of a 2gb kit. The model number is PDC22G8500ELK and the timmings are 5-5-5-9. This stuff is ultra fast, I have had it at 1100 before with ease. I am selling it because I have a line on 2 gigs of mushkin. First $90 in my paypal account and it's yours, shipped priority to your door.