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VRM on the new AM4 motherboards - Page 112

post #1111 of 2036
Quote:
Originally Posted by Artikbot View Post

One thing is at stock voltage, the other is when running at or near the chip limits.

The thermal solution could be better, obviously. The SoC heatsink can take well over its rated capacity, while the core VRM heatsink is a bit on the lean side.

A heatpipe (which the heatsink has room for) would've definitely helped even things out. But the biggest culprit by far is the plastic shroud thing over it.
I believe those VRM's have an operating limit of 125c. So unless you are running p95 all day and every day, I don't see an issue. Wish temps were better but the board should be fine for most folks.
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post #1112 of 2036

It's not the MOSFET temperature only what is a problem - all that heat gets to the capacitors and inductors, reducing lifespan, and it also creeps to the peripheral ICs potentially causing failure points.

 

That they can operate at 125C doesn't mean they should at all times.

   
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post #1113 of 2036
Quote:
Originally Posted by Artikbot View Post

It's not the MOSFET temperature only what is a problem - all that heat gets to the capacitors and inductors, reducing lifespan, and it also creeps to the peripheral ICs potentially causing failure points.

That they can operate at 125C doesn't mean they should at all times.
Guess we'll have to see how the board performs over the next few years before we come to any conclusions.
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post #1114 of 2036

Fine.

 

Only a very very small amount of users will ever push the board far enough for the thermals to become a problem. And most will hit a processor temperature limit before the board will run out of room to breathe.

 

 

And out of those, most would've gotten a higher end board (X370 Taichi, Crosshair VI) but couldn't or didn't want to afford it so they (myself included) settled for a less expensive unit.

 

But in fairness - at 4GHz Ryzen is far beyond its peak efficiency point and the increased heat output, cooling requirements and power consumption hardly justify the extra 150 or so MHz you get out of it.

 

I measured a 4% performance increase at 4GHz over my current clock speed (3.82GHz), while recording a power consumption increase of 69W -+11W.

 

Really not worth it at all.


Edited by Artikbot - 4/26/17 at 1:09pm
   
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post #1115 of 2036
Taichi and K7 cost more or less the same here (245€ vs 252€), I bought the K7 because I had an Asrock Killer and wanted to try another brand. I'm also catalan @Artikbotbiggrin.gif
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post #1116 of 2036

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).

   
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post #1117 of 2036
Apparently Ryzen 7 uses around ~125A at most after overclocking... There really is no VRM on any X370 that can't cope with that.
post #1118 of 2036
Quote:
Originally Posted by DADDYDC650 View Post

Board is just fine. According to tweaktown, "Anything under 60C is great, 60-80C is acceptable, and anything above 80C is a bit worrisome (if at stock)."

We seem to disagree what stock is. Pretty sure chew's not using 'stock' by most definitions there.

I would not be happy with vrm's in excess of 80 when pushing beyond "stock" no matter what definition we use. 'reasons'.
post #1119 of 2036
Quote:
Originally Posted by yendor View Post

We seem to disagree what stock is. Pretty sure chew's not using 'stock' by most definitions there.

I would not be happy with vrm's in excess of 80 when pushing beyond "stock" no matter what definition we use. 'reasons'.

pfttt im at stock with 15 min setup time.

biggrin.gif

14 of those min was reading manual to find power button.
post #1120 of 2036
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.

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.
Edited by AlphaC - 4/26/17 at 1:54pm
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