..but then again, it's Sony we're talking about here. Testing could have been skipped, because it would cost too much in the short term, or something like that..
..I can imagine there are different revisions of the boards. And that some of them run hotter than the others. But that some of them are designed to idle more often than the rest, or the firmware would make the disc spin faster than it's supposed to, or something like that.. Doesn't seem like a good idea unless you /want/ the consoles to break.