If you got way too much ripple you’ll hear it (and it will likely still work anyway).
I would use connectors but yeah XD.
You also need to power the egpu board which may need more than just 12v, for that one of those atx dc converters may be useful but those then to require a 12v input too.
if you need more power you can use 2 HDPLEX 500X or have this one:
I’m very seriously considering this paired with a Dell 360w brick, as a mitigation for the noise issues with the stock FSP/FW PSU
Certainly should work well, just a bit pricey maybe, but keep in mind it will not fully fit in the case either, anything longer than 150mm will hit the front module cables.
I think the FW PSU is 150 without the air pipe so I am hoping it will fit. I’ll plan on a 3d printed plate for the rear either way. I’ll deal with all of then if/when I get my Desktop (batch releases have slowed)
There are the 2 usb cables in the way. so I don’t think it’s much longer than 150mm.
It is 150mm and when replacing the original PSU you actually need to place one of the cables between the pipe and the PSU casing, take a look at the PSU replacement guide. And thats the reason anything longer wont fit.
Thanks. I guess it’ll be an ugly look from the rear then 
Until I get the Desktop, and without drawings showing the measurements, its all guesswork. There may be room to route cables around the DC-ATX converter as its only 31mm high and 51mm wide. I don’t know the measurements of the FSP one (other than it accomodates a 40mm fan) as I couldn’t find it on their website and the measurements aren’t on FW’s site either.
I’ve been wondering about ways to find 10mm but, it’s all just conjecture at this stage. What I do know is that I want a quiet PC
Other possible psu could be any of the ones that are aimed at powering a computer from the car 12V supply.
A car 12V supply can vary a lot so those psu tend to be quite forgiving. Except maybe not supply enough watts.
500W from a 12V DC supply is 42A. That would be a very chunky cable.
Probably better to use 24V or 48V DC supply, so the feed cables can be smaller.
Then I’d suggest to go with the 250W GaN and be done with it, because while you can even pull 200W from that without issue as has been shown, you cannot remove that amount of heat quietly anyway so you’re going to use less which is even less of an issue for that PSU.
Sorry, not following you. What do you mean?
The 250W GaN from HDPlex only provides 20A on the 12v rail and the FW recommendation is 33
Which cable?
A cable that can carry 42A could be a large diameter. Depending on how long it needed to be. A 5 meter cable might be 25mm^2
I know the recommendation, I do not know for what purpose they recommend such a high amount of power.
What I know is that no matter what I tested I couldn’t get the HDplex to show any signs of misbehavior, in my book aside from physical size it is pretty much a perfect fit for this system in its original case where you couldn’t fit any power hungry HDDs or dGPUs anyway.
And for what it is the price is actually very reasonable, my other passive PSUs in full ATX size usually cost more.
I have exactly the same thought. In their PSU deep dive blog, they mentioned:
Although the “peak” power demand of the AMD Ryzen AI Max processor is 140W, it can actually pull hundreds of watts in millisecond-level bursts. Because there is no battery in the Framework Desktop to absorb this, we sized up the Power Supply to handle it and maximize performance.
I wonder what the exact numbers are.
ATX specs had this below. Assuming the HDplex 250W PSU sticks to ATX specs, then it should sustain 250W*135% = 337W for 10ms.
But anyway I’m not a professional electronics engineer, what do I know 
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Other Strix Halo systems also ship with 230-250W PSU’s. I have not seen any issues with my HD-Plex so far, in more than a month, running it on 115W/100W TDP. So the high reccommendation must be for edge cases or beinc on the safe side.
I was just trying it. A fallback option would be the HD-Plex 500W DC/DC converter in combination with the 360W external Dell powerbrick. But that adds up to 300 EUR.
I get all of that you’ve found the 250W to be adequate. I also understand your questioning Framework’s “32.5A on the 12V rail” recommendation. I don’t know either.
I didn’t understand the point below as the DC-ATX I am considering is passive (fanless) so won’t be producing noise
Thanks for the link, @sun. I think this addendum is the current document for the table mentioned in your linked 2022 one.
From that addendum this is the 12v rail table from that document for 13th 14th Gen Intel Core processesor configuration
It would be valuable to locate a Strix Halo document with guidelines specific to AMD’s calculations and metric
The point is that the 12V power recommendation is for 160W TDP with a lot of headroom on top, the system is pulling 213-220W @ 230V and aside from a bit of performance generated that is the heat you need to remove from the case.
That is not going to happen quietly and is highly inefficient anyway - you want quiet means you want efficient - that means you’re best sticking with 100W TDP or even less, that means ~140W @ 230V - but now the PSU requirements are also much less.
And in case you’re wondering about the performance loss, for 64% of the power consumed you get ~92% of the performance, depending on workload sometimes even slightly more.
The 500W DC-ATX sure also would work nicely, but because it doesn’t fit completely inside the case either (actually it looks to me it’s pretty much the same case as the 250W) but in addition you need an external brickt, I see it as a much more expensive solution that provides no advantage in your situation.
