I own a non-Apple PowerPC 970 machine; It runs (on average) at 41C with a heatsink that's very small. That's much cooler than a Pentium 4 of the equivalent era, and the PowerPC is more advanced than NetBurst. The Pentium 4s typically had a TDP of 95 watts, whereas I would estimate the TDP of the one running in my system at something like 50-60 watts.
While the PowerPC 970 was by no means the coolest CPU around, it's not at all hot by any standards. If you take a look at some of Intel's CPUs they'll put the PPC 970 to shame reaching between 105 through 135 watts! Take a look at the QX6800:http://ark.intel.com/products/30720/Int ... 66-MHz-FSB
That thing was starting to become thermonuclear after Windows 7 was trying to run updates in the background
. I didn't find it to be very good performance upgrade either... it literally just ran hotter
. They're still pricey CPUs to this day since they were never all that common.
The heat issues are typically found in the fan-less or compact all-in-one systems (I forget the model of the famous early fanless Macintosh, but 3rd party fan add-ons were released to keep them cool). The G4 cube is another good example, those need
to be ran in a cool environment. The core duo intel Macs had a firmware release to make the fans spin faster because the CPU would run too hot--BUT I had an intel core duo laptop that reached critical temperatures and fried itself-- and that laptop had very good cooling. So really, Intel needed to work on the Core Duo some more before they released it. Heck, they "forgot" to add 64-bit capabilities in the first release, AND WHEN THEY FINALLY GOT TO IT, they made the 64-bit capable chips *even hotter*.
You're right, Rossmann can be a bit like that / but I DO wish OEMs would make modding and repairs more community friendly. Modding UEFI for instance has become more difficult than traditional BIOS mods due to the security checks--meaning if the image is modified it won't flash. SO, you have to physically flash a chip and solder it in. This is not an Apple-specific problem.