Bliizard has officially acknowledged that a StarCraft 2 bug might be frying graphics cards.
The official battle.net support page explains that “screens that are light on detail may make your system overheat if cooling is overall insufficient. This is because the game has nothing to do so it is primarily just working on drawing the screen very quickly.”
This is caused by Starcraft 2 not having any frame rate limits. Fortunately, there is a fix for this! open “Documents\StarCraft II\variables.txt” and add the following lines: