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Building a fanless PC: Northbridge temp problem. Which MoBo should I get? - Page 2

post #11 of 12
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Quote:
Originally Posted by Artikbot View Post

I would dare say the Zotac will run hotter because the NB heatsink and the VRM one are connected, so both are dissipating the heat emitted by the MOSFETs.

The ASRock would definitely have a cooler running chipset, no doubt.

I still don't like the idea of not running one single fan. You should at least run a 500RPM one. Even more on an ITX build.

I have some questions:

I understand the Zotac's heat transmiting the heat of the VRM to the NB and the other way round because they are connected with a heatpipe. Still, regardless of the pipe, the coolers seem bigger. Is that heatpipe a mistake? if it was not there, would the cooling be better?

When you say the ASRock would have a cooler running chipset, you mean this because there is no heatpipe connecting the NB to the VRM or because ASRock chipset builds do it in a cooler way?

There is a silent fan installed, just in case. It's just turned off but I can switch it on easily with a potentiometer. However, for idle use (mostly what I'll use this PC for, I have another rig for video editing and the like) it just doesn't heat over 55ºC (apart from the northbridge) fanlessly.

When the fan is at its maximum and the PC is idle, CPU, GPU and other temps are room temperature (25-30ºC) except for the NB, that never goes below 55ºC way too hot IMO for a nicely air cooled idle rig that has a nice northbridge cooler installed (reason: no proper contact).

Is there anything that makes a Mini-ITX run hotter than a Micro ATX, as in, does the fact that the Mini-ITX is smaller make it hotter?

Thanks a lot.
Edited by xxryux - 5/6/13 at 5:21am
post #12 of 12
Quote:
Originally Posted by xxryux View Post

I have some questions:

I understand the Zotac's heat transmiting the heat of the VRM to the NB and the other way round because they are connected with a heatpipe. Still, regardless of the pipe, the coolers seem bigger. Is that heatpipe a mistake? if it was not there, would the cooling be better?

Most certainly it is there to aid to the VRM cooling by using the chipset cooler. The ASRock uses high quality PowerPAK, ridiculously low RdsON MOSFETs (IIRC, around the boundaries of 4mOhm) and chokes with exposed windings (having the winding exposed helps dissipate heat in them, thus having a lower operating resistance). The heat output by them is really minimal due to the efficiency of the setup, and thanks to the package used in the MOSFETs, a large portion of the heat they generate is being dissipated by the motherboard PCB itself.
Quote:
When you say the ASRock would have a cooler running chipset, you mean this because there is no heatpipe connecting the NB to the VRM or because ASRock chipset builds do it in a cooler way?

Because of it having a separate heatsink. The MOSFET area dump lots of heat!
Quote:
There is a silent fan installed, just in case. It's just turned off but I can switch it on easily with a potentiometer. However, for idle use (mostly what I'll use this PC for, I have another rig for video editing and the like) it just doesn't heat over 55ºC (apart from the northbridge) fanlessly.

When the fan is at its maximum and the PC is idle, CPU, GPU and other temps are room temperature (25-30ºC) except for the NB, that never goes below 55ºC way too hot IMO for a nicely air cooled idle rig that has a nice northbridge cooler installed (reason: no proper contact).

Most certainly it is that, a bad contact. Perhaps adding a couple of washers and replacing thermal paste? That way you'll have higher clamping pressure and a better thermal interface. It sounds like way too high for an H77. Those chipsets aren't particularly hot at all. Even less wtih a fan!
Quote:

Is there anything that makes a Mini-ITX run hotter than a Micro ATX, as in, does the fact that the Mini-ITX is smaller make it hotter?

Thanks a lot.

Besides the much higher component density hindering airflow, there really isn't a reason why they run hotter.

You're welcome smile.gif
   
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Ryzen R7 1700 Gigabyte GA-AX370-Gaming 5 Sapphire HD 6950 2GiB 2x8GB KFA2 HOF DDR4-3600 
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Crucial MX100 256GB Seagate 600 Series 240GB Seagate 7200.14 2TB Samsung F3 1TB 
CoolingCoolingCoolingCooling
EKWB Supreme HF XSPC Rasa GPU EK XT360 EK 4.0 
OSMonitorMonitorKeyboard
W10 Pro LG IPS235 LG E2250V KUL ES-87 
PowerCaseMouseAudio
SF Leadex II 650W Lian Li PC-A05NB Logitech G9 Xonar DX 
AudioAudio
SMSL SA-S3+Technics CB-250 Sennheiser HD555 
CPUMotherboardRAMHard Drive
AMD A10-5700 Gigabyte F2A75M-HD2 G.SKILL Ares 2133 CL9 Hitachi 5K750 
Hard DriveCoolingOSMonitor
Momentus .7 200GB Noctua NH-L9a Server 2012 R2 Standard AUO B156HW01 
PowerCaseOther
PicoPSU-80-WI-25V AIO Aluminium Handmade TP-Link Archer Something Something Wi-Fi AC 
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A dumpload of ancient AGP cards Kingston Value DDR2-667 CL4 2T @CL3 1T Seagate 160GB 7200.10 LG IDE DVD-ROM 
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