- Nov 1, 2013
- 18
- 0
- 10,510
So, don't where to start with this. I have 8 PWM fans connected to a Swiftech 8 way PWM splitter. The splitter is connected to the 4pin chassis fan header on my motherboard (AsRock z77 Extreme4). I also have a PWM D5 pump from EK which is connected on it's own to the 4pin CPU fan header on the mobo.
I can control the fans and the pump separately through BIOS. I have it set to automatic mode so that the fans run at around 850rpm unless the CPU goes over 65°C, which it does not. It's overclocked to 4.8ghz at 1.303v and earlier, four hours of Prime resulted in temps of high 50's to early 60's. Everything stays cool and quiet.
So far, so good.
The problem starts when I start using the GPUs, (two Asus R9 290 DCII). Running either Furmark, Heaven or just gaming, all BIOS settings seem to be forgotten and the fans slowly start to ramp up to 100%, ~ 1500rpm. Or at least I presume it's up to 1500rpm as the HWMonitor or HWInfo stop reporting the rpms once I'm full screen in a programme, ie, they continue to report ~ 850 rpm even though the fans are spinning up full speed.
The cards do produce a lot of heat, even at stock clocks, but the loop is able to keep their temps in the 50's. However the extra heat gets the CPU up to ~70°C.
Now I have tried SpeedFan and everything works well as above until I start using the GPU's and the problem is the same. To test it I have set the CPU target temps to 80°C and fixed the fan speed at 1100 rpm in BOIS. Again, as soon as I enter full screen mode and both GPUs kick in, that fans start to do their own thing regardless of what I set.
I've updated to the 15.3 beta drivers. I've been messing around with SpeedFan all afternoon as well as playing with the settings in BIOS, and even swapping the PWM headers that pump and fans are connected to.
Any ideas?
I can control the fans and the pump separately through BIOS. I have it set to automatic mode so that the fans run at around 850rpm unless the CPU goes over 65°C, which it does not. It's overclocked to 4.8ghz at 1.303v and earlier, four hours of Prime resulted in temps of high 50's to early 60's. Everything stays cool and quiet.
So far, so good.
The problem starts when I start using the GPUs, (two Asus R9 290 DCII). Running either Furmark, Heaven or just gaming, all BIOS settings seem to be forgotten and the fans slowly start to ramp up to 100%, ~ 1500rpm. Or at least I presume it's up to 1500rpm as the HWMonitor or HWInfo stop reporting the rpms once I'm full screen in a programme, ie, they continue to report ~ 850 rpm even though the fans are spinning up full speed.
The cards do produce a lot of heat, even at stock clocks, but the loop is able to keep their temps in the 50's. However the extra heat gets the CPU up to ~70°C.
Now I have tried SpeedFan and everything works well as above until I start using the GPU's and the problem is the same. To test it I have set the CPU target temps to 80°C and fixed the fan speed at 1100 rpm in BOIS. Again, as soon as I enter full screen mode and both GPUs kick in, that fans start to do their own thing regardless of what I set.
I've updated to the 15.3 beta drivers. I've been messing around with SpeedFan all afternoon as well as playing with the settings in BIOS, and even swapping the PWM headers that pump and fans are connected to.
Any ideas?
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