From the top one can see the asymmetrical shape of the fins and the heatpipes. Xigmatek claims that putting the heatpipes off the same line increases the cooling power. I guess we'll have to take their word for it as this can't be tested, but to me it seems like the airflow will be more restricted by the larger area the heatpipes take.
One can also see four screws on top of the fan shroud. Via removing these one can also take off the shroud, which makes installing the cooler easier. Xigmatek's installation manual tells to mount the fan after installing the heatsink, but I found it easier to screw these four screws than to mess around with the rubber pins in the confined space of the case. The screws are self-tapping and directly screwed to the aluminum fins, so I don't suggest one to use this method too much or over-tighten the screws as the screws will eventually lose their grip.
The base of the XP-S964 is slightly polished, but isn't quite mirror-finish. Small marks can be seen, but they are too shallow to have any real effect on the cooling performance. In this image one can see four screw holes on the top and bottom that are used to mount the S775-brackets.
XP-S964 in action. The S964 isn't really that large, it doesn't overlap the motherboard and there was no issues whatsoever of it hitting the heatsinks around the socket.
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