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VRM on the new AM4 motherboards - Page 157

post #1561 of 1989
If it's like AM3 + my MSI 990 GD - 80 was better than my CHV-Z on limited cooling and for " light benches" or validations, but for protracted stress testing the CHV-Z and UD -5 ( though I hated the bios) had the edge.
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Ryzen Shine!
(14 items)
 
  
CPUMotherboardGraphicsRAM
Ryzen 1800X @ 4125mhz 1.432 Volts MSI X370 Titanium   Fury  G.SKILL TridentZ Series 32GB (4 x 8GB) 288-Pin... 
Hard DriveOptical DriveCoolingOS
Samsung 850 pro Hp 1260 I liquid unobtanium Koolance 480mm radiator, 39... Win 7 HP/Winspy 10 64bit 
MonitorKeyboardPowerCase
24" hp @ 1900x1200 Logitech G19 PC power and cooling 910 watt silencer Thermaltake P5 
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Logitech MX 518 fUnc industries 
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post #1562 of 1989
Quote:
Originally Posted by PsyM4n View Post

Maybe it overshadowed the ROG in such a config and they opted not to do it... I will not be surprised if that was actually the case and they've chosen to ditch the dual ti and good coil setup.

We are talking inductors in the nH range. With 4 to 6 turns of AWG 16 wire around a good iron powder core will put you at 250-300nH with good current capability, reasonable rdc and small package.
Even if ASUS managed to get really cheapo inductors there we are still not talking about Nikos efficiency range.

Also phases are phases only. You don't increase current capability with more phases, you do that by increasing the fets count or by having good efficient fets that enable you to meet the current x temp needs without the need of paying that much airflow over the VRM.
Edited by virpz - 5/5/17 at 8:42am
post #1563 of 1989
Quote:
Originally Posted by virpz View Post

We are talking inductors in the nH range. With 4 to 6 turns of AWG 16 wire around a good iron powder core will put you at 250-300nH with good current capability, reasonable rdc and small package.
Even if ASUS managed to get really cheapo inductors there we are still not talking about Nikos efficiency range.

Also phases are phases only. You don't increase current capability with more phases, you do that by increasing the fets count or by having good efficient fets that enable you to meet the current x temp needs without the need of paying that much airflow over the VRM.

The problem here is that "missing" just a couple of turns is enough to increase resistance slightly... and making the coil increase its temperature exponentially as a result.

All is OK if your coil is already speced for 500-600khz or so. However, if you put the fets into a relatively low load scenario and you already reach into the 70c range at 300khz, you essentially kill any potential they have.
post #1564 of 1989
Quote:
Originally Posted by PsyM4n View Post

The problem here is that "missing" just a couple of turns is enough to increase resistance slightly... and making the coil increase its temperature exponentially as a result.

All is OK if your coil is already speced for 500-600khz or so. However, if you put the fets into a relatively low load scenario and you already reach into the 70c range at 300khz, you essentially kill any potential they have.

So, you are telling me that less wire wounds are going to increase the coils resistance ?
post #1565 of 1989
If you make it thin enough. tongue.gif
post #1566 of 1989
Quote:
Originally Posted by PsyM4n View Post

The problem here is that "missing" just a couple of turns is enough to increase resistance slightly... and making the coil increase its temperature exponentially as a result.

.... How less turns are going to increase resistance ?
Edited by virpz - 5/5/17 at 10:11am
post #1567 of 1989
Quote:
Originally Posted by virpz View Post


.... How less turns are going to increase resistance ?

The more you keep bugging me, the more I will be messing with you. Just in case you haven't noticed yet. tongue.gif
post #1568 of 1989
Quote:
Originally Posted by PsyM4n View Post

The more you keep bugging me, the more I will be messing with you. Just in case you haven't noticed yet. tongue.gif

The most intriguing question is:
Why would you keep on trying to discuss things that you had proven ( over and over, and over ) to have absolute zero clues about ?
post #1569 of 1989
Quote:
Originally Posted by virpz View Post

The most intriguing question is:
Why would you keep on trying to discuss things that you had proven ( over and over, and over ) to have absolute zero clues about ?

one word - Troll.
post #1570 of 1989
Ok enough of that....here is something to discuss.

I wonder what the dip switch box was that was removed on release. To the right of the top of the vcore vrm

Also hi c caps on soc pwm...cleaning something up?
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