SFX-L for 4090/5090

Andrew Moore · 8 Mar 2024 at 17:19

As title really, is there anything out there that runs the "new" ATX standard that will happily run that power draw of a card along with the usual couple of m.2s, an ITX board, 64GB of ram, larger draw AIO and an undecided CPU (think 9950x3d should this get announced at Computex).

I'm buying a few bits here and there now and migrating to a new ITX case that can take a 4 slot. Ive got this form factor now so figured I would start with a larger storage m.2, the case, potentially the cooler if mine doesnt fit (EK 280) as well as the PSU. Then all I will need to do is transplant the MB, RAM, CPU and new m.2 OS drive. Ill add the new GPU as and when it is released.

So PSU.. What do you think will fit the bill?

For context, i have an Corsair SFX 750w that uses the older ATX standard and the traditional ATX PCIE connectors.

Tetras · 8 Mar 2024 at 18:27

Does it have to be SFX-L? I'd probably just try what you have if it has enough PCI-E 8 pins for the octopus adapter, or can take Corsair's 12VHPWR cable.

no_1_dave · 9 Mar 2024 at 11:37

Andrew Moore said:
For context, i have an Corsair SFX 750w that uses the older ATX standard and the traditional ATX PCIE connectors.

I was using this too with my 4090/13900k
Swapped it out for the 850w Asus Loki which is SFX-L and it's been perfect

Andrew Moore · 9 Mar 2024 at 13:28

Tetras said:
Does it have to be SFX-L? I'd probably just try what you have if it has enough PCI-E 8 pins for the octopus adapter, or can take Corsair's 12VHPWR cable.

For the sake of about £120 or so I think I’d be better buying another just because I know that 750w is on the edge of what is recommended for a 4070ti never mind anything more juicy. I need to realistically work out the draw over all components as a worst case based on the power hungry parts of today and just hope that not much changes between generations.

I could try the old PSU, worst case I can run the old GPU for a day if the new one proves to be a problem as I wait for a new PSU to arrive I guess.

jammir · 9 Mar 2024 at 16:47

I have been running a 4090 with a 13900k with dual pump and 8 fans on corsair sf750 sfx without issue.

no_1_dave · 9 Mar 2024 at 17:06

Andrew Moore said:
For the sake of about £120 or so I think I’d be better buying another just because I know that 750w is on the edge of what is recommended for a 4070ti never mind anything more juicy.

Testing showed the SF750 can do over 950w before it switches it's self off.

A 4070ti is no match for it. I only swapped mine out with my 4090 and 13900k because I was swapping other stuff already and really 750w is probably on the low side for what I have... If I was using a 4070ti there is no way the SF750 would have come out, it'll easily cope with that

Andrew Moore · 15 Mar 2024 at 01:18

jammir said:
I have been running a 4090 with a 13900k with dual pump and 8 fans on corsair sf750 sfx without issue.

Christ! Really? That’s interesting I must say.. undervolting involved?

jammir · 15 Mar 2024 at 21:00

Andrew Moore said:
Christ! Really? That’s interesting I must say.. undervolting involved?

Not undervolted but cpu stock clocks and the gpu is a FE (actually was worse on a sfx 850).

heman · 7 Apr 2024 at 22:41

Just installed an Asus Loki SFX-L PSU, it's atx 3 rating so only one cable from PSU to the Nvidia 4 series connector (not sure what the name is).

Made by Seasonic, and backed by 10yr warranty, and quiet.

Only had it less than 1wk, but am impressed.

Subliminal Aura · 1 Feb 2025 at 09:08

jammir said:
I have been running a 4090 with a 13900k with dual pump and 8 fans on corsair sf750 sfx without issue.

Blimey, how is this possible?
I have the sf750 but it only has 2 pci-e 8 pin outputs

Are you daisy chaining the connectors?

no_1_dave · 12 Feb 2025 at 17:15

heman said:
Just installed an Asus Loki SFX-L PSU, it's atx 3 rating so only one cable from PSU to the Nvidia 4 series connector (not sure what the name is).

Made by Seasonic, and backed by 10yr warranty, and quiet.

Only had it less than 1wk, but am impressed.

Pretty sure it's Greatwall who make the Asus Loki PSUs, the same company that makes the Corsair SF750

heman · 12 Feb 2025 at 21:38

no_1_dave said:
Pretty sure it's Greatwall who make the Asus Loki PSUs, the same company that makes the Corsair SF750

You are probably correct, especially as I cannot recall where the Seasonic reference was from.

Tetras · 13 Feb 2025 at 18:54

heman said:
You are probably correct, especially as I cannot recall where the Seasonic reference was from.

Asus do use Seasonic a lot, but I don't think they do for this particular PSU.

pastymuncher · 13 Feb 2025 at 19:04

Yes, Great Wall is the OEM for this psu.

On a side note, what is the point of RGB on a psu? You can't even see it in most cases. The fan should be angled down or facing the rear side panel so it's sucking in air from the bottom or the rear side of the case and most cases have shrouds over the psu so you can't see anything on the side. It's pointless and always was.

heman · 13 Feb 2025 at 20:39

pastymuncher said:
Yes, Great Wall is the OEM for this psu.

On a side note, what is the point of RGB on a psu? You can't even see it in most cases. The fan should be angled down or facing the rear side panel so it's sucking in air from the bottom or the rear side of the case and most cases have shrouds over the psu so you can't see anything on the side. It's pointless and always was.

I'd take it a step further, what's the point of rgb on most internal components. It's rgb gone mad. Next there will be rgb cables, if it doesn't exist already.

ZXSpectrum · 14 Feb 2025 at 10:42

I have used the Silverstone SX1000 Platinum in builds and they have been great. https://www.silverstonetek.com/en/product/info/power-supplies/SX1000Platinum/ You could probably get away with an 850w version. You can also get a 12V-2X6 cable that only uses 2 of the connectors. The newer ones are much better than the old 12vhpwr ones as they were very stiff and hard to run tidily.

haszek · 14 Feb 2025 at 13:20

pastymuncher said:
Yes, Great Wall is the OEM for this psu.

On a side note, what is the point of RGB on a psu? You can't even see it in most cases. The fan should be angled down or facing the rear side panel so it's sucking in air from the bottom or the rear side of the case and most cases have shrouds over the psu so you can't see anything on the side. It's pointless and always was.

Yeah, good thing is that if I don't connect rgb cable to psu it is switched off completely. Before I bought mine, I read something that default is red and then it would require connecting to mobo just to turn it off.

pastymuncher · 14 Feb 2025 at 15:02

heman said:
I'd take it a step further, what's the point of rgb on most internal components. It's rgb gone mad. Next there will be rgb cables, if it doesn't exist already.

Sadly RGB cables do exist with Lian Li's Strimmer cables probably being the most well known although there are many others.