Speedfan: oscillating fan speed

[gpcola]

I just downloaded Speedfan 4.49 for the first time in years, hoping to be able to control 3 new GentleTyphoon AP14 radiator fans based on BOTH my cpu and gpu temp - entirely possible using the latest version of Speedfan.

At the moment my loop is in pieces on the floor here so as a test I tried controlling my standard Intel CPU heatsink fan using a Speedfan 'Advanced Fan Control':

I thought this was working as intended because any increase in the load on CPU or GPU results in the fan speed increasing as I wanted, however there is a problem...

Over the course of around half an hour, at idle, I produced this fan speed chart:

These are the associated temps for the same period:

As you can see, there is a badly oscillating fan speed being produced by Speedfan at idle. I don't get this with the Gigabyte Smart Fan application that came with my motherboard, but then I don't get the ability to control fan speed based on two temps with it either

Does anyone here have experience with resolving this kind of problem in Speedfan?

My complete setup (or will be once the loop is back together):

• PSU: Antec HCG620
• Mobo: Gigabyte Z87X-UD4H
• CPU: Intel 4770K
• GPU: Sapphire 7970 Ghz Edition
• Storage: Samsung 840 SSD + 3 x HDDs
• Case Fans: 2 x Scythe SlipStream 800s
• Radiator Fans: 3 x GentleTyphoon AP14s
• Radiator: Thermochill PA120.3
• Pump / Res: Laing D5 with XSPC reservoir top
• Blocks: YBris Cooling 'Black Sun' on both GPU & CPU

 

[Hepokatti]

I had the same kind of a problem. The CPU fan went constantly up and slowly down. I just uninstalled it, restarted PC and then reinstalled it. Work perfectly fine now.^_^

 

[gpcola]

Yeah I eventually managed to resolve the problem in, I think, the same manner. Not sure why it was doing this to start with, but all is now fine