I recently just built a new SFF gaming PC using the Cooler Master Elite 120 case. I have a Zalman CNPS8000b cooler. The fan from the CPU cooler (on bottom of image) will suck air DOWN, the PSU above it will be sucking air UP. They are about an inch apart. I can flip the PSU upside down and it can draw air through top of the case, but then I don't really have anything drawing air out of the case. I guess the PSU still would, but since top of case is perforated it would suck mostly external air.
Is this a concern or nothing to be worried about? Thanks.
In my SFF(SilverStone SG05, much more of a media center then a gaming system), I have the cpu fan flipped(Globe[slightly filed down, yes it is that tight] 1200rmp fan on CoolerMaster Gemini S) for the power supply to eat the air(I know it is not something that can be done with the cooler you have). I know its not perfect, but sure helps overall system temps.