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post #1 of 38 (permalink) Old 01-11-2020, 06:37 PM - Thread Starter
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VRM Fan replacement

Did a search, but since VRM and fan aren't long enough it really doesn't let you do much. Anyway, looking to replace my vrm fan with something a bit larger that moves a bit more air. Was thinking 60-70mm and of course pwm.
Specs:

i9-9900k

Asus z390-e MB
Nothing is over-clocked...yet. But eventually it will be.



Liquid cooled and that 40mm fan that came with the board doesn't seem to move much air. So fabricated a new bracket and ready to pick a fan to mount to it. Open to suggestions, since honestly I haven't found one yet that has actually met the specifications they are listed with.

Appreciate the help and sorry if this is beating a dead topic. Spent hours today reading reviews and searching to see what is out there. So some good solid suggestions that people have used would be great.

SP
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post #2 of 38 (permalink) Old 01-11-2020, 07:07 PM
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fix your case airflow, you don't need a dedicated fan for your VRM.

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post #3 of 38 (permalink) Old 01-11-2020, 07:55 PM
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Pook is right.

I'm guessing since you have a fan that came with the board you truly believe you need a fan. You really don't unless you are doing extreme overclocking with consistent stress. Like stated just use your little fan be sure there is an exhaust fan and you board will be more than happy.

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post #4 of 38 (permalink) Old 01-11-2020, 09:21 PM
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What the ppl above me said. Properly configured case+fans+cooler to play together, goes a long way.....compared to single targeting solutions.....
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post #5 of 38 (permalink) Old 01-11-2020, 11:04 PM - Thread Starter
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Well, I did mention that it is all liquid cooled. The rad and 3 120mm fans are up top. There are 3 more 120's drawing air out of the case toward the front, but other than that there isn't much high volume air movement. I just built this system and haven't gotten around to overclocking it yet, but plan to. So the idea was that since everything else has a fair amount of cooling (liquid) to it, I wanted to target the one thing that really doesn't have much option. There is no air cooled cpu unit, so the diversity of airflow in that area is limited. Hence changing the 40mm fan out to something a bit more substantial. It doesn't need to be 10x the air volume, just more than what is provide with the fan that comes with it. No worries, I'll just keep researching and see what pops up for 60mm with a high static pressure so that it's focused on that area. If you look at the board design, there are two heat sinks. One across the top of the cpu and one along the left side. So I'd like to cover a little more surface area than what is given. Right now there is no extra air flow other than the 40mm and that is directed at a very finite position.
Oh, I'm using the lian li 011 dynamic. So if you look at fan/rad placement you'll see that there is little airflow over that portion of the board when liquid cooling.

Last edited by Soulpatch; 01-11-2020 at 11:08 PM.
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post #6 of 38 (permalink) Old 01-12-2020, 05:45 AM
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Quote: Originally Posted by Soulpatch View Post
Well, I did mention that it is all liquid cooled. The rad and 3 120mm fans are up top. There are 3 more 120's drawing air out of the case toward the front, but other than that there isn't much high volume air movement. I just built this system and haven't gotten around to overclocking it yet, but plan to. So the idea was that since everything else has a fair amount of cooling (liquid) to it, I wanted to target the one thing that really doesn't have much option. There is no air cooled cpu unit, so the diversity of airflow in that area is limited. Hence changing the 40mm fan out to something a bit more substantial. It doesn't need to be 10x the air volume, just more than what is provide with the fan that comes with it. No worries, I'll just keep researching and see what pops up for 60mm with a high static pressure so that it's focused on that area. If you look at the board design, there are two heat sinks. One across the top of the cpu and one along the left side. So I'd like to cover a little more surface area than what is given. Right now there is no extra air flow other than the 40mm and that is directed at a very finite position.
Oh, I'm using the lian li 011 dynamic. So if you look at fan/rad placement you'll see that there is little airflow over that portion of the board when liquid cooling.
You have rad with 3x 120mm fans in top as intake. Maybe put a deflector from radiator about 1/3 of the way from motherboard side angled to within about 1" of motherboard. this should channel the air coming though rad toward mobo and then over VRMs. Hope that makes sense.

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post #7 of 38 (permalink) Old 01-12-2020, 06:00 AM
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I ran my 9700k @ 5.0 on a z390-A (cheapest of the line up I believe) with zero issues, so as pooky said. just get your general airflow up.

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post #8 of 38 (permalink) Old 01-12-2020, 07:59 AM
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Quote: Originally Posted by Soulpatch View Post
Did a search, but since VRM and fan aren't long enough it really doesn't let you do much. Anyway, looking to replace my vrm fan with something a bit larger that moves a bit more air. Was thinking 60-70mm and of course pwm.
Specs:

i9-9900k

Asus z390-e MB
Nothing is over-clocked...yet. But eventually it will be.



Liquid cooled and that 40mm fan that came with the board doesn't seem to move much air. So fabricated a new bracket and ready to pick a fan to mount to it. Open to suggestions, since honestly I haven't found one yet that has actually met the specifications they are listed with.

Appreciate the help and sorry if this is beating a dead topic. Spent hours today reading reviews and searching to see what is out there. So some good solid suggestions that people have used would be great.

SP
Ok, what you haven't stated is if you are actually having any temp issues, or if you are just making a change for the sake of making a change.

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post #9 of 38 (permalink) Old 01-12-2020, 08:48 AM - Thread Starter
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Quote: Originally Posted by ciarlatano View Post
Ok, what you haven't stated is if you are actually having any temp issues, or if you are just making a change for the sake of making a change.

Yes, it's running a bit warmer than I'm comfortable with at the moment. Due to the poor bracket design the fan blows mostly on the shroud that covers the upper left side of the board. So eventually if I go into and over-clock it'll definitely start throttling the system. To give you some background I've been building custom pc's (and cases) since my first tandy3200, liquid cooling started about two years after that and we used to machine blocks and everything from scratch. After about 5 years of stainless parker fittings and bending 1/2" stainless tube I got tired of it and the tech got better for air cooling. We used to hack everything the hard way in order to over-clock and ultimately cool the systems. I even built one into an old a/c window unit once. Went to school for mechanical engineering and spent 25+ years developing prototype power train for everything from Harley Davidson, Ferrari, Big 3 (Ford, Chrysler, GM)...all the way to Caterpillar. I'm also a licensed machinist, 10 certs in welding and program fanuk, motoman robotic welders. Top it off with 25+ years of modding starting with cutting windows, carving glass and cold cathode lighting. So I understand the dynamics of thermal properties in air/fluids. But what I was asking was for a quality fan because even though the website may say 35cfu and 25db the fan may actually run at 30cfu with 40db and have crap bearings. So I was asking about quality/tech on them for a reason. Here's a pic of my current build because for some reason I got a hair up my proverbial backside and decided after 20 years to do another liquid cooled rig. Mostly because after reading the specs on the intel's i9 I knew that it ran hot as hell anyway and overclocking to get the 5ghz out of each core was going to ramp it up. Plus using the lian li case may offer some quality aspects like aesthetics when it comes to cable routing, etc. it takes away from depth and putting in an air cooled cpu system wouldn't leave enough viable space to even put the side cover back on. Which is why the GPU card is mounted vertically instead of the standard horizontal. I know most of the time you guys are dealing with nubes who know nothing about case airflow, setup principals, etc. so I don't take it personally. So taking me at face value and answering the question I had was on myself as well. I should have posted a pic to show exactly what I meant as far as air dispersion and pressure drop over the VRM because that little fan is pretty much worthless. Anyway, here's the pic so you can see what kind of airflow I've really got to work with. I could rig up some channels/deflectors to focus it across the motherboard more, but it'd be much easier to just swap out the fan to something a little more viable. I've already made a new bracket to offset it about an inch more to the right so that it actually covers the heatsinks, etc. The rad fans are pushing air out and the 3 on the right are pulling air that way as well. The corsairs are pwm and i've set the controls and coolant pump to the TC mounted in the coolant loop. Not running a second tc because the loop is so small there isn't enough change in the deltaT to worry about. So those fans only crank up to about 35-40% at max thermal load. The ones on the right are 3 pin and run about 1200rpm but don't move much air (going to be replaced soon with 3 more corsair. The coolant lines take up a fair amount of room as well, so channeling effectively would be tricky. And to answer your question...no, I don't make changes just to make changes. Aesthetics are okay, but I'm more about how the system performs. Besides, why waste the money just because something is the latest "trend"? I read about performance and base purchases off of that. Although I will admit that the new liquid cooling tech is far better than we ever had as far as looks go. Our blocks were all copper and lines all stainless. Parker fittings were $20 a piece and stainless tubing was big money as well. Ran a 50/50 mix of glycol coolant and salvaged parts wherever we could lol Which is why those purple fans are in there. Left-overs from a build long ago lol But ya, the tech has come an amazing way since I first got into it. Let's just say that I've probably been modding pcs since about the time many of the people on here were born, or maybe even before that LOL Oh, the purple is because it's my wife's favorite color and she loves the joker. So I was toying with the idea of a themed rig and doing some airbrushing/artwork throughout the case.

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Last edited by Soulpatch; 01-12-2020 at 09:01 AM.
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post #10 of 38 (permalink) Old 01-12-2020, 09:07 AM
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Reverse your side fans, you basically made an air trap inside the corners.

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