AMD Athlon x4 760k reading 70C from BIOS
- Is 70C normal for an AMD Athlon x4 760k?
- Do I need to reapply thermal paste? (It was pre-applied... i think - also i just have the stock cooler)
- Do I need to buy a better cpu fan?
- Is the BIOS reading the temp wrong?
- Have I not installed the heatsink and fan correctly? (Which way should the fan be 'pushing' the air? Towards the cpu, or away?)
I don't think 70°C is dangerously hot for the chip, but considering it's in your BIOS (and therefore idle) it's alarming. Your load temperatures would be much, much higher than what your CPU is getting to when it's sitting idle, certainly more than is safe.
It sounds like the heatsink may not be properly seated against the chip. I'd get some decent thermal compound such as that suggested above and try re-seating it. And I don't mean to condescend, but if you think there's a chance you're doing something incorrectly you can probably find installation videos for your cooler on Youtube.
Edit: Dust on the heatsink acts an insulator. If there's enough, it can obstruct the transfer of heat from the heatsink into the air being pushed through it. Dust on fan blades is less of an issue, because the fan still basically does it's job.
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