i5 3570K stock HSF "stutter" starts

[MasterShakeJD]

I am using the stock hsf with the ASRock Z77 Pro3 board. The fan struggles to spin up after pressing the power button; it does like two intermittent quarter turns, then runs very fast before slowing down to a steady speed. The computer does seem ok though as I installed Windows alright.

However, when plugging the fan into a 3 pin header (instead of the CPU 4 pin header) the fan still acts the same way. I tried a stock intel fan from an old Core2Duo and it starts immediately when connected to either the 3 or 4 pin headers once the power is switched on.

After reasearching online I thought the first stock hsf was bad so I returned the processor. However, the new one acts the same way. Any ideas? Did I get two bad fans? I'd like to just use the stock one instead of buying another one but am not sure this is normal behavior.

Oh, I know the old Core2Duo fan could be used instead but I need that for another system.

 

[JJ White]

Could be a fan detection setting, some boards have different fan detection options, did you check your BIOS?

 

[MasterShakeJD]

Could be a fan detection setting, some boards have different fan detection options, did you check your BIOS?

Yes, but it didn't act any differently. I actually tried the fan on a different older motherboard (only 3 pins) and had the same issue. So, it is the fan itself. Can't understand the luck of getting two bad ones but it looks like I did.

 

[JJ White]

Could be something built into the fan, it doesn't cause any problems, so why worry?

 

[MasterShakeJD]

Could be something built into the fan, it doesn't cause any problems, so why worry?

Yeah, I know it would probably be just fine but I rather have it working 100% normally as it is a system for somebody else. I'll probably just use a different HSF instead if for no other reason than piece of mind.

 

[JJ White]

Your rig, your choice.

 

[MOG_Hammer]

never use the stock heatsink with those cpus anyway. The one that Intel sells with its cpus is not even good for stock clock @ full load. I do not think that the Intel heatsink you got have any defect. Those act like that by design, I strongly believe. Do not compare two very different design in cpu coolers, even from intel. They might not work the same. Everyone of them is "calibrated" (that's a big word actually) to work with the CPU it came with. Usually for normal computing you would have no issues. But for anything more than browsing, e-mail checking, or word processing, you should definetely get a better aftermarket HSF kit.

Any good aftermarket air cooling solution, depending on the use and on space inside the case, will do a better job.

a good heatsink doesn't have to be pricey. Anything between 60-80$ will do a great job. But the guys here on overclockers.com forum might give more info on what to buy according to your pc case and actual build.