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CPU Fan pulses after reapplying thermal paste.

Last response: in CPUs
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December 8, 2012 3:40:01 PM

First off, specs of said PC: PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-2600K 3.4GHz Quad-Core Processor ($289.99 @ NCIX US)
Motherboard: Gigabyte GA-Z77M-D3H Micro ATX LGA1155 Motherboard ($120.48 @ Mwave)
Memory: Crucial 8GB (2 x 4GB) DDR3-1600 Memory ($38.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($64.99 @ NCIX US)
Storage: OCZ Vertex 3 128GB 2.5" Solid State Disk ($111.98 @ Newegg)
Video Card: EVGA GeForce GTX 660 Ti 2GB Video Card ($314.98 @ Newegg)
Case: Antec Eleven Hundred ATX Full Tower Case ($69.99 @ Newegg)
Power Supply: PC Power & Cooling Silencer Mk II 950W 80 PLUS Silver Certified ATX12V / EPS12V Power Supply ($110.43 @ NCIX US)
Optical Drive: Asus BW-14D1XT Blu-Ray/DVD/CD Writer ($99.99 @ Amazon)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Total: $1311.80
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-08 12:30 EST-0500)

I had to reapply thermal paste because I had to pull my heat sink off since it was a tad loose. I put it back together, started it up, and it all worked fine, except for my pulsating CPU fan. Now, at first I dismissed it because I thought it might be working hard, or something to that extent. It has been about 3.75 hrs since I finished the project, and it has been pulsating non-stop. The CPU load percentages go from 10-30% to 100, then fall, and repeat the cycle. The temps stay around 25C-30C while pulsating, so not terrible. This is a relatively new build at around 2.5 months, with virtually no hardware problems until now.
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December 8, 2012 4:05:27 PM

The fan 'pulses' when it doesn't have enough power to spin the blades, try giving it a boost with your hand, it might start spinning but it will spin slowly.

It is being given a low voltage or frequency depending on what control the fan uses (voltage or PWM) because of the temp, the lower the temps the slower the fans.
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December 8, 2012 4:14:15 PM

jay_nar2012 said:
The fan 'pulses' when it doesn't have enough power to spin the blades, try giving it a boost with your hand, it might start spinning but it will spin slowly.

It is being given a low voltage or frequency depending on what control the fan uses (voltage or PWM) because of the temp, the lower the temps the slower the fans.

I tried that, and it just goes back to pulsing.
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