Over at Gizmodo they have a post on how you can check if you have the new heatsink in your Xbox 360 with out opening it. You just take your camera and put the lens on the vent on the power side. Turn on your flash and take a few pictures. If you end up with a picture like the one below from my new system then you don’t have the new heatsink and might be a getting the Red Rings sooner then you think.