OK I am fully aware that title is covering the absolute basics of what we have all known for years but I have a more specific question I can't seem to find the answer to. Is the YLOD just an inevitability in normal operation with the phat PS3 due to the poor solder used or is it only a result of overheating due to poor cooling/thermal paste? I have a beautiful condition 60GB CECHC03 (UK launch model) with the lovely chrome and obviously PS2 compatibility, that's never suffered a YLOD. I've already delidded both the CPU and GPU and added high quality thermal paste as well as a fan speed mod (50% faster than what the system sets it to). It's pretty loud but I think that's just inevitable with the early ones? All the air flowing out of it is really hot which tells me the thermal paste is working effectively. I'd like to start using it as my main PS3 but if it's still a ticking time bomb I'll mothball it and stick with my Slim. Guess there's always reballing but I'd rather it just didn't go wrong in the first place.