I manually increased the speed of all three fans by a little over 50% and managed to get the temperature down to the mid-40s - even while gaming. I was a bit surprised that the iMac's firmware did not ramp up the fans substantially to bring that number down a bit. I checked the GPU temperature after about 30 minutes and saw that it had reached 80-something degrees. I rarely game, but came across a title last night that I interested me. Over the past few days the weather has been in the mid 30s to low 40s celsius, and the GPU temperature has stayed in the 60s (as shown in the screenshot). Most of my work involves word processing and research. Keep your fingers crossed but don't get paranoid over it. The machine wasn't under any kind of stress at the time but it was the beginning of summer.
Try to clean your vents and keep an eye on the temps. When prices come down I will get one and bring it back from the dead or get it reflowed if I can find someone reputable locally. I have seen new parts for sale online in Canada but at over $300. My machine will only boot into safe mode and I cannot source a new part from Apple where I live. They block very easily and moreso if your heat is humid as the dust becomes sticky. I spoke to several authorized repair shops who confirmed that they slow cooked themselves over time. I looked into this when my graphics card failed (late 2009 i7 27inch) and found lots of RadeonHD cases. If you live in a hot climate without air conditioning the risk of failure is high IMO.
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