Suprising as it seems, after adding 2 OWC 512mb ram modules I've had three instances of OS X crashing. First one was a kernel panic where I got a "please turn off your computer" while moving around about 30gigs worth of data, a second happened after I tried to wake my computer from sleep, only to find that I had to do a cold start, and I got a message box reporting that OS X had crashed again. Today, while playing Diablo II I had a full on OS X crash, followed by a Diablo II app crash after I rebooted and started playing again. I'm worried that the OWC Memory is the culprit, because it is the only component I have changed, and all of this behaivor has occurred after installing the new ram. Sound logical? I hate to think that my ram is the culprit, because it's going to be a pain having to wait for a replacement. If I get another kernel panic or OS X crash in the next 48 hours, that's it, ram is going back.