how to limit max fan RPM

adamjensen · Aug 9, 2014

Hello,

I recently changed form factors for my main build to M-ATX, I have been having some issues with my CPU fan, when I play a game and my CPU starts warming up, as soon as it touches 50 C... ALL HELL BREAKS LOOSE, my CPU fan goes from a very reasonable 2500-3000 rpm to over 6000 RPM!!!

What I want to do is make a max RPM that my fan could run so it doesn't sound like an air conditioner next to me. i have looked through speed fan but it doesn't work for me, ive looked in the bios but there is nowhere to change any fan speeds, I've used easy tune 6 to set a custom fan profile but it doesn't listen to that once it reaches 50 C

build
mobo: gigabyte 78LMT-USB3 (am3+)
CPU: amd 8320 stock cooler
case: bitfenix prodigy M
GPU: gigabyte gtx 770 4gb
psu 600 watt
windows 7 home premium

Eduello · Aug 9, 2014

The AMD stock cooler is horrible, get a better cooler to reduce the noise. I'd get the Hyper 212 Plus/Evo/X (whichever is the cheapest).

adamjensen · Aug 9, 2014

Eduello :

I'm going to get a new cooler either Monday or Friday but I'm looking for something to just keep down the rpm temporarily so my ears don't bleed for the next few days.

Eduello · Aug 9, 2014

There's not much you can do, the CPU will overheat if you turn down the RPM

adamjensen · Aug 9, 2014

the fan doesn't need to run at 6000 rpm for 50C though, on my old build the cpu was steady at 70C with the cpu fan at 4700 Rpm so i know it wont overheat

InvalidError · Aug 9, 2014

Check your motherboard's manual or BIOS to see if you can tweak the CPU fan's thermal profile.

adamjensen · Aug 9, 2014

i was in the system bios for an hour yesterday looking but only thing i could find is a setting the basically 100% all the time if diasabled, i have it enabled so i can use easytune for the (not working) fan profile.

Eduello · Aug 9, 2014

That CPU is not supposed to go over 65C.

InvalidError · Aug 9, 2014

Eduello :

65C package temperature.

What CPU temperature monitoring tools report is the core/die temperature and that can go up to 92C for most AMD chips, 100C for Haswell and 105C for Ivy Bridge.

mamasan2000 · Aug 9, 2014

70c is the thermal limit for AMD CPUs, it's throttling/too hot/can break any moment.
Yeah, that BIOS seems to be 5 years old, most (if not all) modern BIOSes allow you to set CPU fan speed by voltage/PWM or manual mode.

Have you tried Speedfan? http://www.almico.com/speedfan.php

62 C for die, 70 C for package or the other way around, can't remember.

95 C for AMDs graphics cards.

adamjensen · Aug 9, 2014

mamasan2000 :

i mentioned in the question i used speedfan

InvalidError · Aug 9, 2014

mamasan2000 :

The maximum junction temperature is always higher than package since the package sits between the CPU die and the heatsink/air.

There has not been CPUs rated for low maximum temperatures like 70C in about 15 years... pretty much everything from both Intel and AMD produced in this millennium has been rated for 90+C TJmax.

The junction temperatures are in the manufacturers' respective thermal design specifications.

adamjensen · Aug 9, 2014

I just ran a quick 5 minute prime 95 test, and the cpu only got to a max of 53C but the fan was at nearly 7000 rpm and as soon as the cpu was under 50 C the rpm dropped to under 3500. in case you were curious

so does anyone know how i can max the cpu fan max rpm, because this is still a question and not a disscussion.

InvalidError · Aug 9, 2014

Well, if your BIOS has no (working) option to adjust it, you will either have to live with it as-is, add an aftermarket fan controller to override whatever the motherboard is doing or hack it by cutting wires and adding resistors or whatever other method you might want to use to change the fan's RPM.

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