Mwave has the Arctic Cooling ARCTIC F12 Case Fan 5x5 (120mm) for $6 with free shipping. Features low noise impeller and a fluid dynamic bearing to extend service life.
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4 pin connector - can't be controlled by the BIOS
Ah #1, Alot of boards will have CPU_1 4-pin, and lot's of newer ones will have another 4-pin.
This would be decent fan to pick-up as a replacement for an old CPU cooler that didn't come a PWM fan, but your mobo has the fan header.
I assumed it was a Molex connector, but when I looked it up on Google, I see that it is a PWM fan. So it can be controlled by the newer Bioses. And who knows, maybe a voltage control will work with it also.
This is not a PWM that is Mwave part no. AA77209 [I have one of the PWM versions], do not buy expecting anything but a full-on four pin power molex fan.
I'll build a desk fan for workplace.
#4's right there's the "F12 PWM" version and this one I would have thought they wouldn't do two different models? Oh wel the PWM is $6 also but $2 ground shipping.
There are bios which can control fan RPM without the PWM, 4th pin. However, their scale for the % and ramping level may not be the curve implied so some experimentation is needed to achieve the best fan response in any particular implementation.
Considering the above, use of a 3 pin female to 4 pin molex adapter cable has a reasonable chance of success in allowing these fans to be RPM controlled by your bios. Such adapters can typically be bought for under $2, especially if bought more than one at a time, from ebay, SVC.com, meritline et al merchants.
Of course, the other option as someone mentioned is voltage controlled RPM throttling, or current controlled throttling, or of course a proper ready made fan controller.
This being a 1350 RPM fan, you might get a reasonable RPM reduction to a constant speed by merely soldering in a 1W, 68Ohm resistor in series with the fan's positive power lead. It wouldn't respond to temperature changes, BUT it is not as though your system really needs to stay at a constant temperature, only to be kept from overheating... or if overclocking, just kept below the temperature threshold for instability and significant lifespan reduction.