One other thing you may be able to do is underclock the CPU so it runs cooler, or run without hyperthreading. You either increase cooling
or reduce heat generation.
I removed hyperthreading by making it disabled in Bios,could not find where to underclock the processor,the situation is still the same though,temperature is just 2-3 degree Celsius less at 83-84 but the hash rate dropped significantly once I disabled the hyperthreading.
I am quitting mining for the moment until I got like 1-2 Pcs of E5 2640 V1 processors and I got them in stock here at home,once I have them,I am running 100% full power this processor until it fails,I would not care much once I am stoked up with a couple of other CPU-S.