The CPU list is just listing TDP. Of course it's 105W=142W.
But that's what the motherboards tend to assume they're actually running - instead of it being a time limited boost, they just run that boost at all times by default.
Uh oh! I wouldn't trust that power configuration on anything more than a Ryzen 5!
Doublers aren't neccesarily bad, it's really about the VRM's themselves.
Some can provide their full power under 25c and less than half at 80c, while some provide their full power until 120c
I'd trust those ones that work at 120c over any other, even if i did my best to keep them a lot colder than that.
I wanted to know how you managed to get down to 4 watts of SOC power at 1.0V lol
The RAM itself matters - more ranks/sticks uses more power. Figured that out when my SoC wattage dropped when i removed my dummy LED sticks.
VENGEANCE RGB PRO Light Enhancement Kit — Black
But then I found this review which took away my worries. They actually have quite a lot in depht video's which might be useful.
They did indeed learn and fixed this board, then went back to their budget crap shenanigans right after with some bad B550 and intel boards.
Throwing my interpretations on top and pasting his details here for those just reading.
He covers it at the 10 minute mark, in detail like always.
He seperates the VRMs into CPU and SoC and explains it's an 'old 12 phase design'
The power controller is an
IR35201 an 8 phase or 6+2 controller according to it's datasheet "(8+0/7+1/ 6+2)"
The doublerd are 6
IR3599-3599ADS-1.8 "able to drive up to four independent power stages from one PWM input" on the back of the PCB
6 phases doubled to 12 on the CPU fits that description, with the remaining 2 for the SoC.
Because it's got an active doubler it's aware of what it's doing and avoids the problems that caused users to be come aware of doublers in the first place - where they were used as dumb devices and resulted in a lot of inefficient heat waste and voltage spikes/droops.
He calls it a 6+2 x2 - I like that description
"It's still a full 12 phases, just with a slower transient response time"
The doublers are on the back of the board, not the front.
They're basically used as timers to choose which phase the power gets sent to, fairly dumb devices overall.
This isn't bad like the designs that made users aware of VRM doublers because the PWM controller itself is *aware* it has doublers and can send a signal to control which of the phases the power goes to - it can send to group A or group B as it wishes.
The downside is a small delay in power being received, so LLC can be slower to catch up.
This is why boards send slightly more voltage than needed to a CPU by design, to cover up that delay safely - or just bigger capacitors.
Something new I just learned - I love him for this stuff - is that this socket is missing a bunch of capacitors on the back and he calls that out for being part of the reason the transient responses were slow on the board. Lower wattages/LLC levels simply don't need them all - but it's an interesting fact to look for on boards.
Apparently, Gigabyte fill them all out while MSI use around half of them -
heres an Asus Tuf board (a budget one) for comparison
These can smooth out voltage overshoot spikes, but buildzoid does claim it may only be 5 millivolts or so and overall not that important. Just one of many small details that get overlooked.
skipping on, the power stages are the
power stages, which are IR3555's with a 60A max rating
These are multiple components in one, which is why theres less parts here than some boards.
"IR3555 powIRstage (has high side MOSFET, lowside MOSFET and driver inside"
He mentions a datasheet that I can't find, which is unfortunate. He mentions the 3575 is the same thing with a metal tab integrated for better cooling and that they were the best of the best of their era.
Googling the 3575 takes you to a spec sheet and the name of that spec sheet is... the IR3550. Derp?
IR3550 (infineon.com)
Heres the power loss at various Amperage outputs so you can figure out the heat levels you're dealing with
Any given amperage can be at various CPU voltages, so the wattage value can vary here at the same amps!
Amperage tends to scale up with more cores.
Any value up there can be divided by 12 for the phases in use, so at 100A from the CPU divided by 12 you're at 8.33A per phase - under 1.5W per phase which is easy to passively cool without needing a heatsink.
Going to buildzoid who must have zoomed in further to give more accurate values:
At 100A, he mentions you're looking at just 11W of heat out of the VRMs - nothing.
at 150A, from something like a 3900x or 5800x and above - about 15W. Spread over all those FET's, you barely even need a heatsink.
The biggest danger would be if those FET's were running at 100C which is within their specs, nearby capacitors are the devices in danger from the heat
At 200A the board finally hits it's inefficiencies, peaking at 19W.
This has room for the 5950x overclocked that peaked at 215A last page - and you'd finally need a heatsink at ~20W output.
After this isn't worth mentioning because nothing on AM4 goes that high.
He really liked the polymer capacitors on the SoC VRMs and got uspet the board has no graphics outputs as that alone made him want to try APU RAM overclocking. (The three devices in the bottom right)
Summary: Oh no doublers! But actually, a board better than AM4 can even use with decent overhead on the CPU and overkill on the DRAM.
Why am i suddenly posting a lot of motherboard stuff? You'll figure it out soon.
That darn x470 Master SLI/ac was such a good stable board too it's a shame I made such a stupid error and destroyed it.
