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VRM on the new AM4 motherboards - Page 99

post #981 of 2005
I think one of the boards you guys are overlooking is biostar gt7.

Bios support is ehhh but seriously with ref clock not in the equasion. Pwm quality and just normal functionality.....

@ $179.99....you could certainly do worse....

There top board is competing price wise with x370 pro,carbon,gaming 5, killer and fatality k4.

Of all the above boards listed? This one probably offers the most solid pwm...IR 3555 confirmed vs giga IR 3553.
post #982 of 2005
Quote:
Originally Posted by chew* View Post

I think one of the boards you guys are overlooking is biostar gt7.

Bios support is ehhh but seriously with ref clock not in the equasion. Pwm quality and just normal functionality.....

@ $179.99....you could certainly do worse....

There top board is competing price wise with x370 pro,carbon,gaming 5, killer and fatality k4.

Of all the above boards listed? This one probably offers the most solid pwm...IR 3555 confirmed vs giga IR 3553.

Are you saying that the Biostar GT7 has better VRM than Asus CH6 and Asrock Taichi?
    
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post #983 of 2005
Nope just saying in its price range its vrm is certainly not lacking.
post #984 of 2005
Quote:
Originally Posted by br0da View Post

They've had problems with DDOS in the past so some IP regions might still be banned. Sorry for that.
I wouldn't expect them to be interleaved.
The IR3598 parts are used as dual drivers so each is fet with two PWM channels from the controller so each puts out a UGATE, a LGATE and a BOOT signal twice which are interleaved.
So what you get are signals for four interleaved phases since there are two IR3598 for the CPU VCC.
ASRock has to control eight phases with these signals so they need to use each output of the drivers twice so it's the same as for the MSI board.

The IR3598 does list interleaving with 180° out of phase so it would just be Asrock's fault if they did not use the feature. It's unfortunate but understandable if they use PK618.
Quote:
Originally Posted by Medusa666 View Post

Are you saying that the Biostar GT7 has better VRM than Asus CH6 and Asrock Taichi?
Arguably the only Biostar board worth buying on Am4 at this point.
Edited by AlphaC - 4/19/17 at 10:12am
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post #985 of 2005
Quote:
Originally Posted by AlphaC View Post


Arguably the only Biostar board worth buying on Am4 at this point.

No argument from me I took a close look at the GT5 and ran away in fear lol........
post #986 of 2005
Quote:
Originally Posted by AlphaC View Post

Arguably the only Biostar board worth buying on Am4 at this point.

 

More than most vendors there is a pretty wide gulf between their (usually select few) higher-end boards versus the rest of their lineup. Those few higher-end boards also receive the lion's share of BIOS support and active improvement. On Intel platforms it's not a big deal because running a SL/KL i3 on a H- or B- series board from them isn't going to hurt anything, but on more demanding sockets (in terms of power-delivery) and more widely unlocked platforms like AM3+, it was buy their best or avoid them. That uneven stack is what has hurt their reputation more than anything, as you'll find vastly different consumer experiences in terms of board quality, BIOS support, and reliability between people who bought their most expensive board versus those who bought budget from them with an unlocked chip.

 
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post #987 of 2005
Quote:
Originally Posted by AlphaC View Post

The IR3598 does list interleaving with 180° out of phase so it would just be Asrock's fault if they did not use the feature.

What you've basically got is this:

The picture is stolen from the IR3598 datasheet.

As you can see with those 4 PWM signals from the controller and those two IR3598 in double driver mode you can only drive four phases interleaved.
The only way to control eight hardware phases with this setup without using more active components is to use the same LGATE und UGATE signals for two pairs of MOSFETs each.
post #988 of 2005
Other than the gt7 the whole product stack has this:

ISL95712 (4 + 3) sm4377 and 2x SM4364A ..

The other vendors use their own preferred components in the same configurations on lower tiers, but not exclusively. For example


IS95712 (4+3) 4C10N and 2x 4C06N


ISL95712 (3 + 3) PZ0903BK and PK618BA


..
It makes it difficult, for me at least, to point out vrm as a feature considered in pricing. Which thankfully I will rarely have to do. If asked about the less expensive boards though.

I'll feel like a car salesman. "lets forget about gas mileage for a moment, all these will get about the same"....
post #989 of 2005
Quote:
Originally Posted by br0da View Post

What you've basically got is this:

The picture is stolen from the IR3598 datasheet.

As you can see with those 4 PWM signals from the controller and those two IR3598 in double driver mode you can only drive four phases interleaved.
The only way to control eight hardware phases with this setup without using more active components is to use the same LGATE und UGATE signals for two pairs of MOSFETs each.

As I said before it makes sense they would use it in that mode rather than interleaved due to the current limit on the PK618.

The IR3598 does have an alternate application as seen on page 5.



Either way, we know for sure the random mosfet + PK618 on asrock's X370 K4 implementation is an inferior mosfet yet it performs as well as the PK616+ PK632 on the Krait Gaming

The Richtek one only accepts one PWM Input:

http://www.richtek.com/Products/MOSFET%20Driver/RT9624F
Edited by AlphaC - 4/19/17 at 6:09pm
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post #990 of 2005
Is it just me or is the VRM on all the Micro ATX boards a bit on the meh side of things? MSI seems to be using NIKOs across the board for B350 and X370 regardless of ATX or mATX, ASRock appears to be using Nikos as well on thier Micro ATX offerings

Gigabyte is using ON Semiconductor, anyone know anything about them? I haven't really seen them mentioned before

ASRock, Gigabyte, and Biostar are all using the ISL95712 controller

I can't seem to find anything as far as a Datasheet on the Asus offerings in the mATX format on the controller or the mosfets.

With the mATX is a pretty much pick what features you like and the VRMs are all just meh?
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