Some of these power supplies had double role : the cpu socket and the heatsink fins were directly in continuation of the power supply, so in some builds the power supply cooler would also suck air from the cpu cooler and eject it outside the case. Older AT and ATX cases had 80mm fans on the side with the power connector but even those were pulling air out of the power supply. The hot GPU exhaust never makes it to the CPU cooler to warm it up, and is exhausted out the front of the case. If the fan blows in the case, you'll just warm up the insides making the graphics cards fans spin harder to cool graphics cards. What good will reverse airflow do By reversing all the fans in the case (including the CPU cooler fans to match the airflow direction) the rear fan will bring fresh air to the CPU cooler directly. basically you'd need even higher static pressure fans. If the fan blows down on the bottom of the case, the warm air will warm up the desk and there's also gonna be some amount of air that will basically be stuck under the case, making the fan work harder to move air. diagram, if available, to determine which pin matches up to which at the. Unless the power supply is mounted at the top of the case, which again is rare these days. Keep all liquids well away from the motherboard, because water can. If you make the fan flow the other way, cold air comes from outside the case and then one of two things would happen : either fan would blow the hot air down into the bottom of the case or the hot air will go inside the case. There's still heat transfer because the warm-ish air inside the case is still colder than the heatsinks inside the power supply and as long as there's temperature differential, cooling will happen. This is also convenient if the cooler is on the insides of the case - the cooler takes warm-ish air from inside the case (warmed up by the graphics card), moves it over the heatsinks inside the power supply and then pushes it out. The power supplies are designed to push air inside the power supply case using the big fan because the trend these days is to put the power supply on the bottom of the case where the air is colder (hot air goes up), make it flow over heatsinks and then go out through the vent.
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