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VRM on the new AM4 motherboards

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post #3591 of 3621 (permalink) Old 10-07-2019, 12:03 PM
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Quote: Originally Posted by AlphaC View Post
I assume you are highly pleased with MSI X570 MEG Unify motherboard to be released in about 2 weeks. It has been reported on Hardware Unboxed youtube channel as having the 3rd best thermals of all X570 motherboards with its revised heatsink design. It is a slightly cutdown X570 MEG ACE board with no RGB and no Intel lan port, just 2.5 Gb Realtek lan. Otherwise identical to the ACE but has a much larger vrm heatsink not covered by plastic. Only costs $300 US.

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Last edited by os2wiz; 10-22-2019 at 07:13 PM.
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post #3592 of 3621 (permalink) Old 10-07-2019, 12:38 PM
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Anyone see any reported VRM failures for AM4 boards out there ?
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post #3593 of 3621 (permalink) Old 10-08-2019, 11:53 AM - Thread Starter
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Quote: Originally Posted by cssorkinman View Post
Anyone see any reported VRM failures for AM4 boards out there ?
Just the cheaper ones with discrete mosfets. Just rare occurrences thus far.

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post #3594 of 3621 (permalink) Old 10-23-2019, 12:00 PM
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Hot off the presses (figuratively)



http://blog.livedoor.jp/wisteriear/a...4597.html#more
Quote:
A stress test is performed on the CPU to load the VRM power supply that supplies power to the CPU, but the verification method is based on the FF14 benchmark video (playback time 8 minutes, WQHD resolution, 60FPS, capacity 4.7GB) In Aviutl + x264, we performed two parallel encodings and continued to load over 30 minutes. At the end of this stress test, we will check the VRM power supply temperature using the FLIR ONE Pro thermography camera (review) that can be used on smartphones.
...
The basic results are as shown in the table above, and any B450 motherboard can be used as long as it is a Ryzen 7 3700X or Ryzen 3 3600, which has a CPU power consumption of about 90W with a core clock of TDP65W, PB2 & XFR2. I can do it.
The problem is when using Ryzen 9 3900X with TDP105W, ASUS TUF B450-PRO GAMING, MSI B450 TOMAHAWK MAX, and narrowly GIGABYTE B450 AORUS ELITE, ASRock B450 Steel Legend, the cooling condition of the VRM power supply is excellent It became evaluation.

First, about the ASUS TUF B450-PRO GAMING, even in a simple water-cooled CPU cooler environment where the VRM power circuit is not directly exposed to the wind, the core clock by PB2 & XFR2 will be used in the Ryzen 9 3900X, which has a CPU power consumption of about 150W in actual operation. Even when a load is applied, the VRM power supply temperature is 80 degrees or less. It was amazing performance that I couldn't think of as a 10,000-yen motherboard.


The next runner is MSI B450 TOMAHAWK. Compared to ASUS TUF B450-PRO GAMING, VRM power supply temperature is over 90 degrees with simple water cooling & Ryzen 9 3900X, but I think that VRM power supply is in the range where it can be operated just by passive air cooling.

ASRock B450 Steel Legend and GIGABYTE B450 AORUS ELITE were inferior to the above two.
As for the ASRock B450 Steel Legend, the VRM power supply temperature did not exceed 100 degrees within the range that can be confirmed by thermography, but if the load is continuously applied in an environment where the VRM power supply circuit is passively air-cooled, the VRM will take about several minutes. The phenomenon that the core clock is forcibly lowered due to overheating of the power supply, the so-called “phantom throttling”, was confirmed.
Even if a top-flow type air-cooled CPU cooler is used, the VRM power supply temperature cannot be lowered below 90 degrees unless the fan speed is increased.
Measured with a infrared camera , Ryzen 9 3900X VRM temps with Wraith Prism 1900RPM:
MSI B450 Tomahawk Max = 82.1°C
Gigabyte B450 Aorus Elite = 92.1°C
Asrock B450 Steel Legend = 96.0°C


Ryzen 9 3900X VRM temps with Corsair H150i AIO @ 1200RPM:
ASUS TUF B450-PRO GAMING = 79.2°C
MSI B450 Tomahawk Max = 94.2°C
Asrock B450 Steel Legend = 98.8°C
Gigabyte B450 Aorus Elite = 110.2°C


Surprising result to be honest , may have to do with measuring at front of the board (Tomahawk should be cooler than the TUF based on older testing)

edit: a refresher on the topology of the TUF Pro , it's Onsemi 4C10N x8 + 4C06N x8 (4 PWM phase) https://ru.gecid.com/mboard/asus_tuf..._gaming/?s=all

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Last edited by AlphaC; 10-23-2019 at 12:05 PM.
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post #3595 of 3621 (permalink) Old 10-23-2019, 12:18 PM
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Quote: Originally Posted by AlphaC View Post
Hot off the presses (figuratively)



http://blog.livedoor.jp/wisteriear/a...4597.html#more
Measured with a infrared camera , Ryzen 9 3900X VRM temps with Wraith Prism 1900RPM:
MSI B450 Tomahawk Max = 82.1°C
Gigabyte B450 Aorus Elite = 92.1°C
Asrock B450 Steel Legend = 96.0°C


Ryzen 9 3900X VRM temps with Corsair H150i AIO @ 1200RPM:
ASUS TUF B450-PRO GAMING = 79.2°C
MSI B450 Tomahawk Max = 94.2°C
Asrock B450 Steel Legend = 98.8°C
Gigabyte B450 Aorus Elite = 110.2°C


Surprising result to be honest , may have to do with measuring at front of the board (Tomahawk should be cooler than the TUF based on older testing)

edit: a refresher on the topology of the TUF Pro , it's Onsemi 4C10N x8 + 4C06N x8 (4 PWM phase) https://ru.gecid.com/mboard/asus_tuf..._gaming/?s=all
Pretty much how I've seen things play out on my AM3+ Asus vs MSI boards - poor airflow over the vrm, Asus shows an advantage - given equal ( ram cooler attached to cpu vrm heatsink) airflow - I've even seen an MSI 970 gaming run cooler than my CHV-Z.
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post #3596 of 3621 (permalink) Old 10-23-2019, 02:20 PM
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Forgot this test as well:
Click image for larger version

Name:	165W open air.PNG
Views:	153
Size:	604.3 KB
ID:	302086
Click image for larger version

Name:	225W open bench.PNG
Views:	157
Size:	753.8 KB
ID:	302090
Click image for larger version

Name:	225W in O11  case.PNG
Views:	133
Size:	665.9 KB
ID:	302092

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post #3597 of 3621 (permalink) Old 11-06-2019, 07:58 AM
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post #3598 of 3621 (permalink) Old 11-07-2019, 11:40 AM
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post #3599 of 3621 (permalink) Old 11-07-2019, 06:39 PM
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[Igor'sLAB] Asus TUF X570-Plus vs Gigabyte X570 Aorus Elite vs MSI MPG X570 Gaming Edge WiFi

Voltage Regulators and infrared measuring
https://www.igorslab.media/en/big-re...board-sound/3/


TUF X570-Plus vs X570 Aorus Elite vs MPG X570 Gaming Edge (German Video with CC and auto-translate)


Igor'sLAB preview on upcoming CPU + GPU + Motherboard Testing Method

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post #3600 of 3621 (permalink) Old 11-12-2019, 10:16 AM
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Quote: Originally Posted by TELVM View Post
https://www.youtube.com/watch?v=71TtWwbWP-g

As far as thermal performance is concerned (relevant for high-core-count, high-wattage 3900X & 3950X CPUs) the Gigabyte Aorus Gaming 7, with 5x2 Vcore phases and massively overkill VRM heatsinks, might be the best of the X470 lot:

https://www.youtube.com/watch?v=VTCFVoHncXk
Where does it place in the Aorus X570 lineup, VRM+cooling combined?

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