I've got the Z77 version of this board and while the fan control works well, I'm having trouble with the PCH(?) heating up to 52+C which is by no means hot but enough to cause the rear case fan to spin a bit too fast... it also takes ages to get the temp back to low 40s. I wonder if there are any suitable passive PCH heatsinks available for it?It looks like a standard push-pin type of deal
. I've had success using Zalman heatsinks, such as http://zalman.com/global/product/Product_Read.php?Idx=133
. They also used to sell the pincushion type, but I found the flower to work better because it's slightly slimmer (although taller). The improvement won't be much since it's just a chunk of aluminium with pushpin retention, but at least it catches more air than a flat chunk.
If you have to get serious, there's the Thermalright HR-55: http://www.thermalright.com/html/products/chipset_heatsink/hr-55.html