I had one stick that died in 3 hours. Big deal I sent it off for RMA right...Nope I have to send in the hole kit, both sticks. This is going to put me without a machine. I emailed them about it and they said they have to do this to stop miss-matches. I mean how hard is it to read the serial number and send the same one back? For this one reason I will never buy from them again.