MSI B350 MORTAR + Master luiquid RPO 240

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hamdikhouaja

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Dec 1, 2017
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Hello, i have a problem installing My AIO luiquid cooling into the mother board
The aio cooler has two fans connectors and waterpump connector
But the motherboard has only CPU_FAN connector and does not have a water_pump connector !
i have an adaptator that comes with the aio cooler that connects the two fans to CPU_FAN
So i have no place to connect the water pump connector to the mother board
Should i replace the motherboard, or just plug the waterpump connector to the SYS_Fan connector!

Motherboard : MSI B350 Mortar
AIO liquid cooler : Cooler Master Master luiquid PRO 240
 
Solution
Barty1884
If you can get by without extra headers, then I'd connect the pump to the CPU_Fan header, and the fans (via the splitter) the SYS_Fan.
You want the pump to always be running (as a "CPU Fan" would)..... the SYS_Fan header would still allow you to control the fans for the AIO - but the pump is the priority IMO.
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Barty1884

Barty1884

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Apr 16, 2015
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If you can get by without extra headers, then I'd connect the pump to the CPU_Fan header, and the fans (via the splitter) the SYS_Fan.
You want the pump to always be running (as a "CPU Fan" would)..... the SYS_Fan header would still allow you to control the fans for the AIO - but the pump is the priority IMO.
 
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Solution
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hamdikhouaja

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Dec 1, 2017
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Looks like that's the only solution i have, but pumping water won't be perfect, fans will turn at low rpm ! I think i'will send back the mortar and order MSI carbone to have best cooling for my 1800x
 
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drea.drechsler

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Oct 16, 2017
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I have a B350M Mortar motherboard and a Master Liquid 240 AIO cooler (not the pro, but very similar). Including the CPU fan header there are 4 fan headers total on the Mortar so it should work, if I understand what you're asking.

Just like Barty posted: using the 'Y' adapter provided with the AIO cooler I connected the two radiator fans to one SYSTEM FAN header and then the PUMP to the CPU-FAN header. I had to set the CPU fan header to run in 'voltage controlled' mode so the pump speed would follow CPU temperature otherwise it runs at 100% all the time; I use a profile where it's at like 70-80% then pops up to 100% when CPU temp goes above 60C or so.

After that, I still have two other fan headers to attach two case fans (another 'Y' adapter) and a fan to cool the VRM.

You have to set a fan profile in BIOS (or using the MSI utility, whatever it is) for each fan header so the fans attached run at desired speeds for a given temperature. Also, remember that both fans attached using a 'Y' adapter will operate at the same speed; it's best if both are identical so they work correctly. If your ML- Pro fans have switches to set fan speed be careful how those are adjusted since the Mortar also controls fan speed. I'd probably just set them to full speed.

Be sure to use PWM control mode only for actual PWM fans or the fan will always run at 100% (maybe also 0% if the duty cycle is set too low...can't remember).

Oh, and DO NOT attach a fan and the pump to the same header using a 'Y' adapter! Performance will be weird and unpredictable!

 
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hamdikhouaja

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Dec 1, 2017
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Very detailed solution and its the only possible way to do it ! Am planning to oc my 1800x to 4g, so, I want a perfect cooling method, connecting aio fans to system_fan resultes to asynchronised cooling efforts, since system_fan does not detect CPU temperature, pump does, am thinking about double splitter, like the one used for aio fans, so both fans and pump will be connected to one connector (CPU fan connector) but only one connector for the hole system would enough, I do not know ! Finally I contact my provider to send me another mobo (x370 carbon that has both water pump connector and CPU fan, this should be perfect) and I should send back the b350! I have a daily heavy rendering job, I want to focus on my job and feel confident about my system!
 
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drea.drechsler

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Oct 16, 2017
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It's not true that the System_Fan headers don't adjust speed based on CPU temperature as they do. Mine certainly are.

Also, do not be concerned that it says CPU_FAN instead of WATER_PUMP. The MasterLiquid coolers' pump isn't high current (like a custom loop's pump might be) and the CPU_FAN header is perfectly adequate for powering it. Put the pump on the CPU_FAN header and the radiator fans on a System_Fan header. You're doing it wrong if you're doing it different!

Have you worked with the BIOS FAN Profile screens? If you do you'll see that you can make each of the four headers to work with either PWM or Voltage controlled fans and set a temperature curve/profile for each header that works off of CPU Temperature. Set them up correctly and it will work correctly!

That said: you'll probably have difficulty getting a stable 4.0Ghz out of an 8 core on a Mortar, or any other mATX AM4 motherboard for that matter. No mfr puts a VRM section on an mATX that can deliver stable enough voltage at load to make it pass stress tests without the VRM temp's going through the roof. And at voltage higher than I'm comfortable with, at least. I'm good at 3.95Ghz but prefer 3.9Ghz for margin on my Mortar and a 1700. So if 4.0Ghz, with the reliability you're wanting, is a determined goal for you it might be better to get an ATX board with a strong 6 or 8 phase VRM anyway.

Also, depending on how long your rendering jobs run you might find a custom closed-loop liquid cooler is needed; or at least a 360mm AIO. You need a lot of cooling capacity to carry that load. Many people report 240mm's will only go about 2 hours before they thermally saturate and then your CPU temperature starts climbing again. Just something to think about since you stated that reliable operation is critical.
 
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