yeah I remember seeing one of these, but was a manufactured pc and had a chassis fan taking the air out thanks to the help of a plastic tube and had a heatsink like 2 or 3 times larger than normal slot1 CPUs, the slot1 Pentium 3 at the stores came with a proper integrated fan and a heatsink much more smaller, and for the record, you can achieve passive cooling on modern PCs, but you need efficient heatsinks and at least one fan directing the hot air out. one mistake the xbox 360 has was have a not very efficient heatsink for the fan extracting the hot air, and the fact that CPUs have more room than consoles.
I had no outtake fan on that one other then the one from the PSU ;p
And yes, it was a massive heatsink.
The 360's cooling design isn't all that bad.
It just needs an intake fan.
Something MS forgot.
I meself modded a 40mm fan on the 2nd heatsink of me Falcon.
Cut a hole in the side right over it.
It's been idling at 45 ish and 50 ish under load c: