Integrated GPU problems

Hi, Few days ago, I overclocked my integrated gpu. Then the next day, I played few minutes of games and it started to give me BSOD. After that, I DID reset it to default settings. I still have a few more months till I can get a MSI HD6670. I still have my HD4650... When I use it, it makes white screen and then gives BSOD if I turn my computer on more then few minutes. It's probably that I max overclocked it and fried it. Any suggestion what I should do to keep it stable for about 1month? Do I get a few bucks for recycling or selling my fried gpu on ebay?