I've recently upgraded from A10-7800 to A10-7870k, but the heatsink that came with the CPU didn't fit my motherboard so I had to use my old one, after applying the thermal paste the CPU was running around 50°C - 60°C, I tried to use my old A10-7800 to see if it was just the heatsink, but for some reason I got the same results, if not worse. I've tried cleaning and reapplying the paste several times, but still get the same results. Any ideas?