This is a better motherboard than the ASRock B650M Riptide(which seems to get discounted the most frequently).
60A Smart Power Stage + 8 Layer PCB effectively confirms it's capable of running a 7950X. Buildzoid says it's the best of the "budget" AM5 boards.
So he's saying
-having 50a sps is downside "compare to other boards"
-It might be 6 layer board which is not great for ram overclocking.
But he also says "it could support 7950x"
(So as Asrock's supported cpu list on the board)
He never mentioned 50a is not enough or at risk of sth, or how much Ampere you need for 7900x or 7950x.
And he had a look at the memory qvl list as well, which states up to 6200 xmp mem OC support.
For now, only hynix memory chips are capable of 6200.
With samsung chips as well, but only when you're lucky.
Yeah, the B650M Riptide can support a 7950X, but OCing will be heavily limited by the motherboard's VRM. Same goes for RAM.
If you have CPU upgradability in mind (usually the case with Ryzen) then the B650M Riptide is an even worse option with Zen5 being the first redesign of the Zen architecture since Zen 2 (which brought in chiplets). There are rumours AMD will be upping the core count of mainstream CPUs to 24, which would increase TDP and a B650M Riptide might start having serious problems.
Mind you, the same applies to this Gigabyte Aorus Elite to a degree, but it's still definitely an overall better motherboard than the Riptide.
@SvcKpc: At least for the current 4 cpus, their over windows is quite small.(5.5->5.7 e.g.)
That's why ppl focus on undervolting or curved optimizer.
Not sure about future proof, but than rather go to the high end x670/x570e board with over 100a vrm/sps whatever they call.
But my main question is still remain the same. What's the Ampere we need for a certain spec of power consumption or number of cores? How much watt can a 50a sps motherboard deliver?
E.g. 12v * 50a = 600W?
Even riptide's 50a is already Dr.MOS, not a random two-piece cheap one.
@Tleaves: It's not quite that simple. Because power stage efficiency looks like this, with the peak efficiency being at a significantly lower point than the rated output, you have to tune the phase count so that the whole VRM is at its most efficient with your expected load. For example with an 8-phase VRM (midrange B550 board) and 100A draw (R5 at full load) the peak efficiency would be obtained with ~70A power stages. Each one operating at 20% of their rated capacity. However, it's not actually that common for the CPU to be loaded fully. So the manufacturer may choose to use lower capacity phases or fewer of them. Sacrificing 100% load performance for average and idle efficiency. As you can see from this graph, the descending tail is a lot longer than the ascending one - running at 50% of capacity is more efficient than 10%.
This is just the most basic overview. The manufacturer is balancing a lot more than raw efficiency. For example it might be cheaper to use fewer phases but with a larger heatsink if aluminium is cheap but components are expensive. Then you have to consider that we're in a VRM arms race. More phases are selling boards right now even if that means the VRM is operating less efficiently.
Primer:
https://en.wikichip.org/wiki/voltage_regulator_module
@SvcKpc: If you talk about the cost cutting on manufacturers' side, maybe. But I just wonder about the capacity or number of phase I need for 7950x.
Even a lot of the last gen x570 boards used 50a 4x2~7x2phase. I mean, 5950x's peak consumption is known as ard 140w, but stil, some models didn't even use Dr.Mos, and reported the modules get hotter than 70°.
And if that's not easy to explain, it's also the same that 60a or 75a might be not enough for 7950x. No one can have a long term review for new products, and no one explains which is enough or not. And no one compared which mosfet is better - the 50a one used on the cheapest asrock vs 60a one used on this board.
@Tleaves: So what's the consensus?
If using 7950x "stock" (i.e. auto boost, but no manual OC), is the riptide the better buy or is this one the better buy (i.e. will riptide not be able to cope with auto boost on 16 cores?)?
@jkim: I might be wrong, but almost every b650 board with Dr.Mos would be good enough for 7950x, to boost 16 cores. They usually say Dr.Mos on their product description page if it is.
But if you want all core max boost on 7950x, probably need to consider either
- go with a strong cpu cooling(e.g. 420 AIO)
Or
- 280or360 aio + pbo and curved optimiser negative 20~30 setting.
@Tleaves: I'm going with the cheap EVGA 280 AIO (tier 2 AIO on LTT) from BPC and the aorus RAM from Amazon, just need a MB… but the BPC riptide deal seems to have expired :(.
@jkim: :( that's sad. I might be on the same boat too, though. I ordered riptide wifi from bpc, but apparently, the courier didn't scan it properly when they picked it up. So..no one knows where my motherboard is.
$324 is considered budget , what a time to be alive.
Correction: "budget", not budget :)
Quotation marks very important here.
Is b650m pg's 50a 12phase not enough to run 7950x?
The cpu has 230w tdp, draws 300w max w/o any setting, and ~200w w/curved optimizer.