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VRM on the new AM4 motherboards - Page 113

post #1121 of 1994
Quote:
Originally Posted by AlphaC View Post

Gigabyte X370 K3 and K5 are basically B350 VRM


----

Main reason why the IR3553 is pushing these temperatures besides the heatsink is the 1.1X power loss @ 1.4V compared to 1.2V.

Tbh i think software is wrong.

Got some black tape to block reflective metal issue with flir or ir guns..

Those trained to use them properly are told to use electrical tape.

But anyway 50c + im sure of...74c?

Not sure yet.
post #1122 of 1994
The 20-25A it is pushing (per phase) suggests it should put out about 3-4W of heat at each mosfet if all 6 phases are used.

Thermal resistance to top of package is 23.2 °C/W ; 22.2 °C/W to ambient. (lower resistance to ambient than 50°C/W of TI NexFETs)

http://www.irf.com/technical-info/appnotes/an-994.pdf
Quote:
ΔT = RTH X PD
where:
ΔT = Temperature difference (C) between junction temperature and reference temperature (TJ - TRef); TRef is the ambient, package case or package lead temperature
RTH = Thermal resistance (C/W) between junction and reference point (package case or package lead)
PD = Power dissipated (W)

(So it's possible to have it hit 115°C , which is less than the 150°C limit, if the heatsinks are garbage and/or nonexistent.)
Edited by AlphaC - 4/26/17 at 2:38pm
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post #1123 of 1994
Quote:
Originally Posted by NightAntilli View Post

Apparently Ryzen 7 uses around ~125A at most after overclocking... There really is no VRM on any X370 that can't cope with that.

 

The problem isn't the ability of the switching stage to cope with the current, but with the heat.

 

On a side note, I wonder what temperature limit did Gigabyte use?

 

E: as per their datasheet, if it is heatsunk and with direct airflow, there's no derating needed to account for up until ~60C ambient, which is quite encouraging I must say.

 

But yeah, the derating with output voltage is a downfall of the solution chosen. It shouldn't be huge in most cases, as under air or water nobody will ever reach the 1.2x factor... but still to be taken into account.


Edited by Artikbot - 4/26/17 at 3:44pm
   
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post #1124 of 1994
Quote:
Originally Posted by Artikbot View Post

The problem isn't the ability of the switching stage to cope with the current, but with the heat.

On a side note, I wonder what temperature limit did Gigabyte use?

E: as per their datasheet, if it is heatsunk and with direct airflow, there's no derating needed to account for up until ~60C ambient, which is quite encouraging I must say.

But yeah, the derating with output voltage is a downfall of the solution chosen. It shouldn't be huge in most cases, as under air or water nobody will ever reach the 1.2x factor... but still to be taken into account.
Well yeah. Of course. But the higher the current the more heat, obviously. And well, if your VRMs are made for 300+A and you're using 125A, well, the heat should be more than manageable. At least, to reasonable clock speeds of up to 4.1 GHz. After that things ramp up quickly, but Ryzen isn't that stable anymore anyway at that point.
post #1125 of 1994
No speculation no thrills. Just facts and data..K7

https://youtu.be/aN124-DNpQA
post #1126 of 1994
Seems voltages are pretty much dead on, that's good

60-69°C seems pretty decent for that high voltage , so Gigabyte could have used a higher amperage PowIRStage

Swapping to a 60 IR3550 / IR3555 would be ~ 1.6W power loss per phase at 20A (less than the ~2.5W loss of the IR3553) and also less thermal resistance to the top of the mosfet (larger surface area).
Edited by AlphaC - 4/26/17 at 5:35pm
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post #1127 of 1994
Quote:
Originally Posted by Artikbot View Post

I got the Gaming 5 because I saw zero reason to get the K7 (other than a BCLK clockgen that is well... hardly worth it if you ask me, I'd rather keep the extra 35 EUR in my pocket).
I had the Asrock Fatal1ty Pro and ended up returning it for the K7. I got the K7 for free using my perks at work credit that I had. Figured I'd use it on a board that performs decently and looked great. Asrock Pro was a nice board though. Just wish the color scheme was neutral. Taichi was also an option but it looks ugly and not enough RGB's. thumb.gif
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post #1128 of 1994
Quote:
Originally Posted by chew* View Post

No speculation no thrills. Just facts and data..K7

https://youtu.be/aN124-DNpQA

Great video. I've been thinking of putting my mobo on a spit....
I'd rather not leant it on the side to get to the back. Maybe if I gut an old case or drop some.money on mountain mods. My knees are also getting old.
Edited by yendor - 4/26/17 at 6:23pm
post #1129 of 1994
Quote:
Originally Posted by yendor View Post

Great video. I've been thinking of putting my mobo on a spit....
I'd rather not leant it on the side to get to the back. Maybe if I gut an old case or drop some.money on mountain mods. My knees are also getting old.

Plan on cooking the motherboard or cooking hotdogs with the vrm?

tongue.gif

All jokes aside on ln2 i dont have to worry about freezing vrm..

To cold clocks start to degrade when pwm freezes. The switching actually slows down a bit.
Edited by chew* - 4/26/17 at 6:53pm
post #1130 of 1994
Quote:
Originally Posted by chew* View Post

Plan on cooking the motherboard or cooking hotdogs with the vrm?

tongue.gif

All jokes aside on ln2 i dont have to worry about freezing vrm..

To cold clocks start to degrade when pwm freezes. The switching actually slows down a bit.

I've been using the matx asus b350. the little hooker with out heatsinks.
Think they have some oem only versions of the same board .
Would not sell this as iit stands in any premade configuration with unlocked oc available.
They've been up around 70-75 under prime if software is right.. and for that matter if the sensors are even for vrms. this I do not know. Only temps in hwinfo showing up under board section.
I've got a spare case fan parked on top of them so I'm pretty damn sure this board has little hope of magically being cooler in a typical case...

On the other hand there's that bios for the hp ryzen flavor someone is getting to play with. Lucky guy .. .
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