Presume you have the "fat" ps3?
Upgraded my ps3 to 320 2 years ago, took a risk and bought a 7200, which runs quite a bit hotter than the standard 60gb 5900 (i think the speed was).
It has frozen 3x, it's high up in the room and if the missus has the fire and heating on you can here the fan kick in.
Be very very careful with the bolts holding the cage in, I ended up using pliars to remove one as the metal is very very soft and easy to round.
The actual swop out takes 2-3 minutes inc the pesky bolts – make the back up shorter by deleting as much stuff as you can beforehand (d/led demos etc).
I had looked at getting linux onto it – but tbh I'm not that fussed on that side of things and with the slim other OS support it'll slowly die out over the next few years anyways (not that it was massive).