VRMS, Suck hot air away, or blow cool air down ?

ThrashZone · Sep 18, 2018

Hi,
I would not worry about top being a exhaust at all
Front intake and also top works well
All air will find it's way out the back of the case where it's supposed to go
Computer case manufactures wouldn't put filters where they thought an exhaust would be

Indeed just try to point the top intake more towards the vrm/ memory/..

jclafi · Sep 19, 2018

My GA990FXA UD5 shutdown at 85ºc, but this is the socket temperature.

The Pook said:
No VRM shuts down at 84c. Either you're looking at the wrong probe or it's not reading correctly.

JackCY · Sep 19, 2018

Well you're running negative pressure for sure if you have 3 exhaust fans and your only intake is the restricted radiator.
Why worrying about VRMs if you have at least some airflow over them? If you need it better then make the top an intake if the VRMs are right under it.
Having radiator as intake is a bad idea to begin with.

ENTERPRISE · Sep 19, 2018

JackCY said:
Well you're running negative pressure for sure if you have 3 exhaust fans and your only intake is the restricted radiator.
Why worrying about VRMs if you have at least some airflow over them? If you need it better then make the top an intake if the VRMs are right under it.
Having radiator as intake is a bad idea to begin with.

So far my temps are just fine with the configuration I have with the Rad fans as intake. I also have additional fans on the otherside of the RAD in a push pull config, so any warmer air bought into the case from the RAD is quickly dispersed. Even at full load, if I put my hand behind the radiator, there is not a billowing amount of heat coming from the RAD to cause particular concern. I do get the logic of not having the RAD as an intake, however as it is at the moment, the top fans do kick out heat from the case/VRM's.

If I were to switch the top fans around, I would be kicking that heat back ito the case making oveall temps worse in my opinion.

ThrashZone · Sep 19, 2018

Hi,
Yep top fans intake help push whatever heat from the front rad down and then out the back
Only component that might suffer is gpu and they already run hot if on water it makes no difference again at all
Both rigs my gpu's run full blast at 40c-45c tops.

ENTERPRISE · Sep 19, 2018

ThrashZone said:
Hi,
Yep top fans intake help push whatever heat from the front rad down and then out the back
Only component that might suffer is gpu and they already run hot if on water it makes no difference again at all
Both rigs my gpu's run full blast at 40c-45c tops.

This was my concern as well to be honest. Once my GPU's are in place which will remain on Air cooling (For simplicity sake due to my lack of time to sit down and mess around lol), I did not want to make the case any warmer affecting the load temps of the GPU's

ThrashZone · Sep 19, 2018

Hi,
I've never even considered front rad as exhaust simply because it would be blowing nearer to me

But if you really are gpu sensitive you might put the rad on top and exhaust it.

I'll have to look back but did you ever post an image of the build ?

ENTERPRISE · Sep 19, 2018

ThrashZone said:
Hi,
I've never even considered front rad as exhaust simply because it would be blowing nearer to me
But if you really are gpu sensitive you might put the rad on top and exhaust it.

I'll have to look back but did you ever post an image of the build ?

That is something I may consider if GPU temps are super poor. I will post up an image of the build soon

ThrashZone · Sep 19, 2018

Hi,
I just recently "first of this year" went full loops and gpu's were always air cooled cpu was always aio's on front and as intake as I've stated
GPU's weren't noticeably effected I do live in Texas

Moparman · Sep 19, 2018

I would blow air across them. The 2990wx is a monster and having that extra air going over the vrm is a must.

gamefoo21 · Sep 20, 2018

Something to remember, is that VRM's are more efficient the cooler you can keep them. Heat makes them use more power, which is a vicious cycle of more heat = more power needed = more heat generated. Another aspect to consider is that VRM's that are kept at a more stable temperature, will last longer.

Most VRM's are rated at 105'C at the minimum now a days, though that temp seems to be the capacitors.

I'm not a fan of monoblocks but that's another topic for another day.

Edit: Super cooling the mosfets is probably not a good idea, the ones I've looked at don't like to go below -20'C, though if you get industrial rated ones they can operate down to -40'C. Just like you don't want too much resistance, you don't want too little as well.

ENTERPRISE · Sep 21, 2018

gamefoo21 said:
Something to remember, is that VRM's are more efficient the cooler you can keep them. Heat makes them use more power, which is a vicious cycle of more heat = more power needed = more heat generated. Another aspect to consider is that VRM's that are kept at a more stable temperature, will last longer.

Most VRM's are rated at 105'C at the minimum now a days, though that temp seems to be the capacitors.

I'm not a fan of monoblocks but that's another topic for another day.

Edit: Super cooling the mosfets is probably not a good idea, the ones I've looked at don't like to go below -20'C, though if you get industrial rated ones they can operate down to -40'C. Just like you don't want too much resistance, you don't want too little as well.

Efficiency was more my concern as well. While I know VRM's are ''Ok'' to be on the toastier side compared to to other computer components, I did not want to needlessly abuse them. It seems popping the fan to blow cooler air on them has done the world of good fortunately.

I did not want to go as far as getting a monoblock for them (not that they exist for this motherbaord right now anyway)

TwilightRavens · Sep 21, 2018

Personally in my use case at least I have a 240mm rad with 4 x push/pull fans as the intake on the front, at the top, but towards the front of the case I have an intake, and a rear 120mm with 2 fans in push/pull as an exhaust and everything seems to be a bit cooler if I do it that way (including the VRM's). But that could be because the 290X rad I have isn't dumping even hotter air than the 240mm rad for my CPU into the case. I don't know though I think as long as you have an exhaust fan in the back or the top and they aren't sucking air from the other it would be fine. Anyway to really answer it, I think both are needed as you need cool air to cool it, but you also need a fan to remove the heat too.

ENTERPRISE · Sep 21, 2018

TwilightRavens said:
Personally in my use case at least I have a 240mm rad with 4 x push/pull fans as the intake on the front, at the top, but towards the front of the case I have an intake, and a rear 120mm with 2 fans in push/pull as an exhaust and everything seems to be a bit cooler if I do it that way (including the VRM's). But that could be because the 290X rad I have isn't dumping even hotter air than the 240mm rad for my CPU into the case. I don't know though I think as long as you have an exhaust fan in the back or the top and they aren't sucking air from the other it would be fine. Anyway to really answer it, I think both are needed as you need cool air to cool it, but you also need a fan to remove the heat too.

Thanks for the insight,

I have my front RAD with 5x 140mm fans in a push pull config as an intake to the case, I have 2x 140 to the top as exhausts and 1x 140mm fan to the back as exhaust. I do also have a 140mm fan angled blowing up air through the VRM heatsink into the top 140mm exhasut Fans to immediately exhaust the hot air out of the case. This generally seems to be working well, especially when I am benching for OC stability as I can feel a good amount of warm air coming out the top of the case which I will attribute to the VRM's mainly.

VRMS, Suck hot air away, or blow cool air down ?

ThrashZone

jclafi

JackCY

ENTERPRISE

ThrashZone

ENTERPRISE

ThrashZone

ENTERPRISE

ThrashZone

Moparman

gamefoo21

ENTERPRISE

TwilightRavens

ENTERPRISE

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