I've had my i7 iMac for months now, and it's acted perfectly with no hassles or quirks at all-- until the past couple weeks after I installed 4gb of kingston ram. The problem occurs whenever I enter fullscreen mode with flash programs-- rather it be fullscreening a youtube video or a livestream. It's more of a 2-3 second freeze, rather than a full-scale freeze. After the freeze, the computer acts normal again, but iStat menus shows one of the lynnfield's processing cores to have a sudden spike in usage for that small period of time (a spike that reaches to the top of that specific core's capacity) It's not an everytime type of deal, and I only get it maybe once every other day, but it seems to be happening after installing the additional ram. System Profiler has the ram as running fine, and repairing disk permissions doesn't do any help either. I highly doubt it has anything to do with the SMC or PRAM either.