Hmm... How are you testing GPU load temps? I like to use the monitor built into Riva Tuner, as it allows me to watch the peak temps while I load test using ATI Tool's 3D view. My 6600LE is around the same temp for load and idle thanks to my fan control. It runs around 68C idle and 73C load, with temps going down to 48C when I run the fan at full speed.
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