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Use the stock fan (if it has one). If not, it's ok to have it post, but be sure to shut if off when it does.

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33 minutes ago, JarJar69 said:

I wouldn't let it just to make sure it post that's it 

It really isn't a good idea and if you do it, know that YOU are assuming the risk of completely ruining your cpu

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Best to put a heatsink on -- you don't want to damage your brand-new CPU on a brand-new motherboard.

Your CPU might not make it past POST. CPUs gets hot faster than your think -- especially without any heatsink at all.

Plus, some motherboards won't even work without a fan connected to the CPU_fan header.

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