Thats were I put the 80mm fan
But it touches the heatsink so I can't close up the case. And yeah the PSU thing got me as well.. It don't think it exhausts into the case, just the heat from the PSU itself makes it down to the core contact. And that heats up the cpu, haven't OC yet. Gonna run prime for a while tonight just to make sure my heatsink is finally on right.
Case mod would be a good idea, something I'd do for sure instead of buying a new one. Place the PSU upside down and add a 250mm exhaust fan on top? Only thing is cutting, I'm sure I could find somewhere or someone but it depends on how much it costs.
Those fans are 38mm thick though... I have this case Newegg.ca - COOLER MASTER Centurion 534 RC-534-KKN2-GP Black Aluminum & Mesh bezel / SECC Chassis ATX Mid Tower Computer Case - Computer Cases
and there isn't much room to slide in a fan to the HDD fan place without removing the bay themselves. Just measured and there's about 4cm of room so it would work, just a little tight.
edit: I feel incredibly dumb asking this but where is the CPU multiplier located in the BIOS? I've looked through every option and can't seem to find it. I'm using the biostar TA790GX.