I would recommend you to remount your cooler. It shouldn't be idling at that temperature at all since its at stock speeds.
Already checked it, it's mounted properly. Could it be that I've used too much paste? It's a long story, but I decided to go with someones advice that went against everything I've ever read/heard about thermal paste --to use a very small dot and press with heatsink to evenly spread-- instead I used a thick layer and scraped off the remainder that squeezed out when I mounted the cooler. However there is a problem with that idea, it was running very cool even after multiple hours of heavy gaming. The problems started when I lost power a few days ago, powered up my computer again after lights shut off and came back on and it was running very hot, reached 90C in under a minute of idling in BIOS. I updated the bios the other day and the temps got knocked down to 70C after 5 minutes of idling in bios and didn't go higher. Could it be that something is fried on the motherboard? I have a surge protector, so it shouldn't be fried.