psu help

daveheath1888 · 2025-09-19T00:28:26+0100

was originally going to get the corsair rm1000x psu but considering getting the rm850x instead to save a little money and because the rm1000x is out of stock but the motherboard i intend to get (MSI B850 EDGE TI) uses 2 8 pin power connectors and 1 8 pin pcie power connector for additional power,the rm1000x had connectors for the 2 power connectors and 4x pcie so enough for a 3x8 pin gpu and 1 x8 pin for the motherboard pcie but the rm850x only has 3 pcie connections, is it worth waiting for the rm1000x to come back in stock or will the rm850x be ok.

Tetras · 2025-09-19T00:35:34+0100

To clarify, what are you saying? That you would be unable to use the motherboard's additional 8-pin PCI-E connector?

tamzzy · 2025-09-19T00:40:24+0100

You have/are getting a 9800x3d and a 9070xt. Realistically 750w is fine for the above combination.
Just get the 850w and be done with it. You're just over things tbh.

daveheath1888 · 2025-09-19T01:52:26+0100

Tetras said:
To clarify, what are you saying? That you would be unable to use the motherboard's additional 8-pin PCI-E connector?

yes i think

Tetras · 2025-09-19T01:59:32+0100

daveheath1888 said:
yes i think

From what I'm aware, those connectors are not required, at least, there are MSI users on reddit who say their board runs fine without them.

tamzzy · 2025-09-19T02:09:51+0100

It's not required.
I have a MSI b650m mortar in my main rig and it runs just fine on a single 8-pin

daveheath1888 · 2025-09-19T03:29:37+0100

it i get the corsair 850w i can populate the 2 cpu connectors but if i get a gpu that needs 3 pcie's then i cant put one in the motherboard additional pcie slot, but if i get the corsair 1000w i can.

tamzzy · 2025-09-19T04:15:00+0100

You don't need to populate both CPU connectors is our point.

daveheath1888 · 2025-09-19T05:15:01+0100

although i just noticed the 9070 xt powercolor red devil says "Minimum System Power requirement 900 w", so it sounds like i should go for the 1000w just in case.

Tetras · 2025-09-19T13:57:33+0100

daveheath1888 said:
it i get the corsair 850w i can populate the 2 cpu connectors but if i get a gpu that needs 3 pcie's then i cant put one in the motherboard additional pcie slot, but if i get the corsair 1000w i can.

That's what I was referring to, if you look on reddit, there are comments about the new MSI motherboards with the PCIE connector and they're apparently not needed. I think MSI put that there for future cards, but I believe the 50 series mainly draw from their external power connectors, not from the motherboard.

Personally, I don't find the RMx series to be anything special, so if you don't want to wait, I'd choose an alternative.

daveheath1888 · 2025-09-19T14:41:35+0100

what alternative?

Tetras · 2025-09-19T14:55:27+0100

daveheath1888 said:
what alternative?

How much were you going to pay for the 1000 RMx and 850 RMx?

daveheath1888 · 2025-09-19T17:43:05+0100

£130 to £150

Tetras · 2025-09-19T18:07:56+0100

daveheath1888 said:
£130 to £150

You could go with any of these, reviews for most models can be found at hwbusters.

My basket at OcUK:

1 x Phanteks AMP GH 1000W 80PLUS Platinum ATX Power Supply Modular - Black (SKU: POW-PHK-02521) = £128.99
2 x UK Mains Plug with 13A Fuse to IEC C13 Socket Lead 10A 2m (SKU: ACC-OCS-01709) = £0.00
1 x be quiet! Pure Power 13 M 1000W ATX 3.1 80 Plus Gold Power Supply (SKU: POW-BEQ-05638) = £129.95
1 x MSI MPG A1000G PCIE5 UK PSU 1000W 80 Plus Gold Power Supply (SKU: CA-00W-MS) = £139.99
1 x Super Flower LEADEX III GOLD UP 1000W 80 PLUS Gold Power Supply PCIe 5.1 ATX 3.1 (SKU: POW-SFL-04172) = £149.99

Total: £556.91 (includes delivery: £7.99)