it is covering 2/3rd's of the fan so how can it direct airflow around psu better if it's just being directed out the back vent? well one things for sure, my psu fan doesn't spin up anymore. even at full load the fan don't move. so i blocked the vent just to see if i could getting the temps to rise enough for the fan to kick in and it did. but the heat coming from the top of the psu before the fan turns on is somewhat warm. the temp of the componants must be quite hot?
Annihilator V2.0Processor: Intel Core i5 3570k @ 4.5Ghz @ 1.3v With Zalman LQ315Memory: 8Gb Corsair Vengeance Pro 1800Mhz 9-9-9-21-1THard Drive: SanDisk X110 128Gb Toshiba DT01ACA100 1Tb Video Card: Asus GTX 780 DirectCU II 1162Mhz Core 6600Mhz MemoryMonitor: LG 24" 1080pOperating System: Windows 7 64 bit ProfessionalMotherboard: ASRock Extreme 6 Z77Case: Coolermaster HAF 932 with Corsair HX1050 PSU