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VRM on the new AM4 motherboards - Page 32

post #311 of 2899
is it 4+3 doubled to make 8+6 for gigabyte?

really noob on VRM, you can tell.

Also when i looked at the mobo, it seems like it has like 16 phases, but some of the phases is smaller and in weirder places, like next to the PCIE slot, or next to the OC/CMOS button for example.

Just curious what each phase is for.

oh wait, i meant my gaming 5.

apparently there's less phases on the k5?
Edited by ChronoBodi - 3/18/17 at 2:08am
     
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post #312 of 2899
Quote:
Originally Posted by ChronoBodi View Post

is it 4+3 doubled to make 8+6 for gigabyte?[

No afaik there is not a single Gigabyte design for AM4 that is using doublers for the CPU VCC.
AB350M-Gaming 3, AB350-Gaming 3 and AB350-Gaming have got four true phases, AX370-Gaming 5 and AX370-Gaming K7 are using six true phases for CPU VCC.
K3 and K5 do look like using four true phases either.
The only doublers Gigabyte is using are on the Gaming 5 and Gaming K7 since the controller is able to handle two phases for SoC VCC and there are four phases instead.
Quote:
Originally Posted by ChronoBodi View Post

Also when i looked at the mobo, it seems like it has like 16 phases, but some of the phases is smaller and in weirder places, like next to the PCIE slot, or next to the OC/CMOS button for example.

Not every choke on the board is a VRM phase for the CPU.
Keep an eye on the stuff around the CPU socket.
post #313 of 2899
Quote:
Originally Posted by ChronoBodi View Post

is it 4+3 doubled to make 8+6 for gigabyte?

really noob on VRM, you can tell.

Also when i looked at the mobo, it seems like it has like 16 phases, but some of the phases is smaller and in weirder places, like next to the PCIE slot, or next to the OC/CMOS button for example.

Just curious what each phase is for.

oh wait, i meant my gaming 5.

apparently there's less phases on the k5?

No, just plain 4+3 phases (VDDCR_CPU : VDDCR_SoC).

The phase count doesn't really matter for Ryzen (quality does, as usual).
I'd be happy to take a board equipped with a 4+1 phase ultra-high quality VRM, over a MSI X370 Titanium for example.
post #314 of 2899
Quote:
Originally Posted by The Stilt View Post

No, just plain 4+3 phases (VDDCR_CPU : VDDCR_SoC).

The phase count doesn't really matter for Ryzen (quality does, as usual).
I'd be happy to take a board equipped with a 4+1 phase ultra-high quality VRM, over a MSI X370 Titanium for example.

Yea, just saw that the gaming 5 is 6+4, and the k5 is cheaper 4+3 but still good VRM.

Although, how craptastic is the VRM on MSI Titan mobo? I mean.... $300 can get you a good x99 board, but relatively speaking, $300 is a LOT for an AM4 platform mobo.

for $300, it should be Asrock Taichi VRMs.

What the heck is a Nikos mosfet and all that for MSI?
     
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post #315 of 2899
Quote:
Originally Posted by ChronoBodi View Post

Yea, just saw that the gaming 5 is 6+4, and the k5 is cheaper 4+3 but still good VRM.

Although, how craptastic is the VRM on MSI Titan mobo? I mean.... $300 can get you a good x99 board, but relatively speaking, $300 is a LOT for an AM4 platform mobo.

for $300, it should be Asrock Taichi VRMs.

What the heck is a Nikos mosfet and all that for MSI?

NIKO Semiconductor is one of the more known companies that make mosfets. Their fets are relatively cheap and reliable when used within specs, and are widely used by many known companies on various applications.

The problem is that some companies, in order to save costs, sometimes implement nikos fets of specific characteristics in applications that they shouldn't. The most common way they do this, is by using high resistance fets for the regulation of high voltage range, high-power range, enthusiast oriented hardware (ie: overclockable cpus and gpus). The end result is mosfets smoking, hardware failing.

In the particular case of MSI Titan, the nikos fets used are fine. They should be able to handle any overclock of existing ryzen processors. They should also be able to handle future processors with higher tdp, although additional air flow should be used around the vrm for extreme scenarios.
post #316 of 2899
Thread Starter 
Quote:
Originally Posted by br0da View Post

Looks like the VRMs on K3 and K5 are the same, I'd expect an ISL95721 in 4+3 configuration paired with two 4C06N as the lowside and one 4C10N as the highside for CPU VCC.
SoC VCC will use the same FETs but with just one FET as lowside.

That would be the same as on the AB350-Gaming 3.

Not entirely. while the Gmaing K3 and K5 might have 8 X 4C06N on the lowside the Gaming 3 only has 6 as far I can tell from pictures. Some odd layout with 2 of the four phases have two and the other 2 have one 4C06N

Some Cinebench results:



Need lots and lots of volts the be able to run even Cinebench with 4000Mhz.

This isn't stable though. Just enough to run Cinebench at all without lockup or blackscreen right away.

Went down on voltage and clock to see what I can get with max ~1.450 Vcore


+0.270 voltage offset.

still not stable can't do Prime95 Blend. Down to testing 3925Mhz with +0.270 voltage offset now.

3925Mhz seems stable, Blend hasn't locked up yet. VRM is Hitting 90C with core at 62C. Will need to run longer. but has gotten the farthest yet.
Edited by Nighthog - 3/18/17 at 4:47am
    
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post #317 of 2899
Still trying to pick a good Mobo, my micro center has MSI X370 XPower Gaming Titanium AM4 and MSI X370 Gaming Pro Carbon but no ASUS ROG CROSSHAIR VI HERO X370 AM4. do you think its worth picking one of the MSI mobo's up with the 1700 or should i just wait around for the ASUS mobo?


price being

MSI titanium $260
MSI gaming pro $180
ASUS $245
post #318 of 2899
Is Prime X370 available?
post #319 of 2899
Here in UK, yes. An owner in Ryzen owners thread posted photo of VRM, it has same Ti NexFET as C6H.
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post #320 of 2899
Quote:
Originally Posted by Shawn Shutt jr View Post

Still trying to pick a good Mobo, my micro center has MSI X370 XPower Gaming Titanium AM4 and MSI X370 Gaming Pro Carbon but no ASUS ROG CROSSHAIR VI HERO X370 AM4. do you think its worth picking one of the MSI mobo's up with the 1700 or should i just wait around for the ASUS mobo?


price being

MSI titanium $260
MSI gaming pro $180
ASUS $245

Wait for the ASUS. No question here. The Ti is overpriced. If the Ti was at the price of the pro, then it would be a viable choice.
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