FrostyTech has put up a review on the Thermal Integration TI-V77N Heatsink

Remember how much fun the original Thermal Integration TI-V77L was? Double that and then add in a 25mm thick 5000RPM fan and you have the TI-V77N - which draws so much current TI have set it up to connect via a Molex pass thru. If you look at the picture below of this nifty little unlabeled fan you will also notice it is upside down. The impeller supports are on top, making it look as though the fan is exhausting air up and away from the heatsink. Well, that is not what it is doing. Rather, the blades on the impeller are backwards and the fan is actually sucking in air and blowing it out the bottom.... where it would seem to normally intake air.

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