Originally Posted by Rainmaker91
80mm fans are not exaclt needed to get decent VRM temps, two 40mm fans might be more managable in some cases. That said, my limited testing on the subject shows that VRM temps even with large heatsinks is heavily dependent on the air flow put over them. It's obvious I know, but the temperature differences of just case flow can impact the VRM temps of about 5*c alone. It's all dependent on the heatsinks in use though so the bigger the surface area you have the less air flow you can get away with (but subsecuently higher air flow will have an even bigger impact on temps).
Generally speaking it's best to go for as big of a fan as you can place close to the heatsinks. So if you can then a 140mm fan would be best for both performance and noise, but it would be useless if you have to place it far away from the heatsink to get the space. So for a lot of people a 92mm fan seems to be the sweetspot as it's roughly the width of the PCB and can thus often be placed very close to it as well.
Personally I'm currently using 80mm fans since It was the best option I had available for the current fitting I have, but 92mm fans or even 120m fans would perform better at a lower noise level.
I agree the bigger the fan the better, that is why I said at least..
An 80x15 30cfm is the smallest I would recommend, 92x15 is probably the best balance. Not that smaller wouldn't work in some scenarios or rejecting bigger as not better. The real point as you state is sufficient airflow arranged for good flow over the cards sinks.....
Any red mod requires it.....
To be real honest I think his problem might be MB throttling the pump based upon CPU temps. The motherboard is never going to give a full power application to the pump. Put on a CPU as it was designed, it may if the CPU gets hot enough, but it is never going to do that for the GPU.
Another thing is to get a mini GPU fan header adapter for the radiator fan, so the card can control the cooling fan, when the GPU gets hotter, the fan pushes more air.
one fan- 3/4-Pin Fan Connector (Male) to 4-Pin GPU Mini Fan Connector (Female)
two fans push-pull- Mini 4-Pin GPU to 2 x 4-Pin PWM Fan Adapter
Three fans- Mini 4-Pin GPU to 3 x 4-Pin PWM Fan Adapter
two card fans and a radiator fan or one card fan and two radiator fans controlled by the card temp sensor.
Hooked up this way the radiator fans are responsive to the heat from the GPU heat sensor and the bearingless pump is running 100% when connected to the power supply for full cooling fluid flow. That eliminates any issues with inadequate cooling.
Those adapters can also be used to control the VRM fans also.Edited by Egilman - 7/13/16 at 4:34pm