Not 100% sure - maybe thermalright HR-05 series NB heatsink ? but QX9650 runs cooler than E6850 and here's my E6850 on the DFI LT X38-T2R with Thermalright Ultra 120 Extreme + 120x38mm Panaflo 103cfm fan positioned the way pictured below
Room temp = 28.8C

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