That is an ok cooler i guess...according to this link that heatsink would keep a 9650 cpu around 55 load so it may just be the heatsink isn't good enough for a 9850 since the 9650 is only a 95Watt and 9850 is 125Watt. I would suggest better case flow. Get a couple more fans in there, that will help at least a little.
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