Just wanted to let everyone know that may not know how hardware and software work there is no way a game can "Melt" your GPU. This issue has been discussed to death on the SC2 tech support forums (to the point of needing to close it), by people who know what there talking about.
datth a technical support employee at Blizzard posted this -http://us.battle.net/sc2/en/forum/topic/248296509?page=3#54 "As other users have said, the upkeep of your hardware is your responsibility. There isn't a bug in programming code that would cause your hardware to overheat or die unless it was already on its way out. Nothing can help a ticking time bomb. We've offered two variables to cap the rate at which you render the game for less than optimal cooling conditions (for example, my media center box in a Mozart Sx HTPC case, where my 8800 is on a riser card and it's barely hovering over the entire motherboard) but what you do with the rest is up to you.
There's a hard cap on your GPU and memory frequency set by your manufacturer and that serves as a protection mechanism. That and their cooling solution they use keeps the card in working condition when it's clean and has good air flow. StarCraft II (or World of Warcraft since we had a few people say the same thing about it) does not change your GPU/memory clock speeds so it can only go up until the video card's upper bounds when it is not bottlenecked by your CPU. You're supposed to plateau out heat-wise as you can't push instructions thru the chip and memory at a higher rate.
If your hardware is damaged, you need to go talk to the damaged part's manufacturer and see if you can get help there."