H100i v2 + AM4 on my X370 Taichi

Haaviko wrote: Hello All, Just want some help with my X370 Taichi BIOS setup and what header on the mobo do I plugin my h100i v2. Do I set all fans to full speed PWM or leave all default + monitor M/B. Kind Regards, Haaviko.

Have you ever used an H100i v2 in the past? I assume you are using the stock fans?

I doubt you would like the fans running at full speed all the time, they are known to be loud at full speed. No need for the fans to be at full speed all the time.

You can configure the pump and fan connections two ways.

One is to connect the fans to the H100i pump and use the Corsair fan speed control, with the pump connected to the CPU_OPT/W_PUMP header. In the UEFI/BIOS, you set the CPU_OPT/W_PUMP header to PWM mode, and use the Full Speed built in fan speed profile. Then connect the Corsair Link cable to a USB header and install the Corsair software for fan speed control. With this configuration the mother board will not show the fan speeds, that will be done with the Corsair Link software, since only the pump is connected to the board.

The other way is to use the mother board's fan speed control for the fans. Connect the pump to the CHA_FAN3/W_PUMP header, set to PWM mode in the UEFI, with the Full Speed fan speed profile. Then connect one fan to the CPU_FAN1 header, and the other fan to the CPU_OPT/W_PUMP header, selecting PWM mode for this header, and select CPU Temperature monitoring for this header. You can then select any of the built in fan speed profiles for each header, or create a custom fan speed curve for the fans using the FAN_Tastic Tuning feature in the UEFI. You can still connect the Corsair Link cable and use the Corsair Link software for temperature monitoring, but the fan speed control and fan speed monitoring is done by the mother board.

Haaviko wrote: I'm pretty much doing the first method you listed, except using the CPU Fan header rather than CPU_OPT I noticed no difference?

Haaviko wrote: I'm pretty much doing the first method you listed, except using the CPU Fan header rather than CPU_OPT I noticed no difference?

I suggested the CPU_OPT header only because it has a higher maximum power capacity than the CPU_FAN1 header. CPU_OPT is 18W, CPU_FAN1 is 12W. Otherwise there is no difference between them.

The pump does not use that much power, and I'm not sure what the fans use. But since the pump and two fans are drawing power from one fan header, why not use the one that has a higher power capacity? Can you read the label on the fans and see their power rating? For example, it will be something like: 12V DC 0.300A.

Haaviko wrote: So what you're saying is If I plug the pump into CPU_Opt instead of CPU_Fan the pump runs at full speed rather than the fans?

No I don't think that is what he means, because that is not what automatically happens.

He said he can hear pump noise with the pump connected to a fan header set to full speed/power all the time, when the PC is idle and the fan's speed are low and they are quieter. So he connected the pump to a different header so he can control its speed separately from the fans, without using the Corsair Link software.

nangu, I did a similar thing with the original H100. I had the pump connected directly to the PSU with a molex to three pin adapter, the idea to keep it at full speed all the time. But it made too much noise that way, so I put a simple, single manual fan speed controller between the PSU and the pump. I could reduce the voltage to the pump a little bit, and it was much quieter without loosing much speed. I'm sure you do the same thing with the fan speed control in the UEFI.

Well I've got it set on the CPU_Opt header now and Corsair said to use PWM even though its only a 3 Pin.. for the h100i v2.

I can control to pump speed using Corsair link, so why do I need to use DC?