Long history: I knew the MBP radeon failure rate but not usually repair that such of thing. I not and expert.
Last week a went to visit my brother where he lives with his sons. He has a Mac mini 5.2 with 6630m. It has random shutdown frezzen problems but It was so random.
My first and wrong idea it was that gpu it was dead, as I said i was wrong. And After about 6 hours and with the only help of a polimeter I found the problem was the PSU. I order one and in tree days the MM was fixed.
But looking into the gpu problem I found this forum I the doubt came to me about if it posible apply the MBP FIX to mac mini 5.2