My rm850w psu only come with 2 pcie cable, can i use the split to connect to the 4080S power adapter or do I need to buy another cable from Corsair
My rm850w psu only come with 2 pcie cable, can i use the split to connect to the 4080S power adapter or do I need to buy another cable from Corsair
36 Comments
Forbidden, especially a 4080 Super
It is recommended that you use a separate cable for each one if you can, but if all you have is is the cable with two plugs, it should be fine to do that. If you run into any stability or crashing issues though, an extra cable would be the first thing to try.
It’s fine. Corsair PSU does 300W per 8pin to PSU. So, in your case, that’s 2x 8pin = 600W. That 4080 only needs 450W.
Reason why Nvidia recommends separate cables because there are PSUs that only does 150W per 8pin.
You can buy $20 Corsair 12Vhpwr cable and have much cleaner look. https://www.corsair.com/us/en/p/pc-components-accessories/cp-8920284/600w-pcie-5-0-12vhpwr-type-4-psu-power-cable-cp-8920284
It’s fine, just not recommended. Starting with the 3000 series Nvidia highly recommends using seperate cables per connector, or better yet get a direct PSU to 12vhpwr cable from the PSU manufacturer
my man is a surgeon
It’s okay, that’s the normal way to use them
Using the adapter method scares me, I bought a Psu along with a GPU just because of this fear.
So you’re wondering if you can use the pigtail?
https://knowledge.seasonic.com/article/8-installation-remark-for-high-power-consumption-graphics-cards
The **recommended** way to power a GPU over 225W is with an individual power cable per connector, but it should be okay to use the pigtail if the card isn’t under heavy load.
For 30-series Founders Edition cards with the 12-pin adapter you will need a separate cable per 8-pin connection, this is listed as a requirement, not a recommendation. This doesn’t change for the 40-series.
* Make sure that 12VHPWR connector is fully plugged into the GPU. Really. It’s also supposed to be easier to connect the adapter before installing the card.
The reasoning has a few facets: using fewer cables means the cables carry more load making them run hotter, which increases resistance, which makes the cable hotter and the PSU work a little more. A sustained loading could expose any flaws in construction.
Not all PSU cables are made equal, those with thinner wires won’t handle heavy loads as well as those made with heavier gauge wire.
I don’t know if anyone has done more the GamersNexus on transient spikes yet, but it seemed that some of the recommendations from PSU and GPU makers to use more cables is to mitigate some of the issues related to transient spikes causing the PSU protections tripping.
MSI has something similar: https://www.msi.com/blog/we-suggest-80-plus-gold-1000w-and-above-psus-for-nvidia-geforce-rtx-3090-Ti
But being focused on a 3090 Ti kind of puts a dent in the appeal.
[ThermalTake](https://i.imgur.com/lelbjsX.png) has a version that’s hidden in a PDF, which is similar to the earlier version of what Seasonic had.
[Silverstone](https://www.silverstonetek.com/en/tech-talk/wh_pcie-connection) seems to say they won’t cover warranty if an issue arises from using a pigtail on a power hungry card. They include [their power cable suggestion graphic](https://www.silverstonetek.com/upload/images/tech/WB21-GRA/PCIe%20connections.jpg).
It’s fine. Each of those wires can carry around 340w, so you have almost 700w available to that adapter. A 4080 pulls 350w tops.
No, it is 100% ok
Even if you can I’d rather just drop the few extra bucks and be safe on such expensive parts imo.
Excommunicado
The 12VHPWR adapter is the weak point in that setup. If anything is going to give you an issue it’s that. Your power supply has much heavier gauge wires than the adapter. While, certainly this is not recommended, if you ever had an issue with this setup, my money would be on the adapter, and not use of the pigtail.
https://cablemod.com/product/cablemod-c-series-pro-modflex-sleeved-12vhpwr-pci-e-cable-for-corsair-white-16-pin-to-dual-8-pin-60cm/
What does it say in the manual?
The Corsair 12VHPWR cable actually only has two 8-pin connectors at the PSU end, so this isn’t really any different tbh.
It’ll be fine, but if you *can* use three seperate cables, then I would do so.
Also, Corsair only uses the MiniFit HCS connectors, which have a higher current rating than the basic-bitch connectors that the official spec from PCI-SIG calls for.
I use this on a 4090 MSI Suprim Liquid X and 1000w Corsair rmx1000 and it works great.
This is what your manual says:
https://preview.redd.it/jbi6rsclhvxc1.png?width=909&format=png&auto=webp&s=ce269706686246d8fa9bba2b47b4233768091124
Looks fine to me
The manual says not to do that on most cards atleast. Mine did. I think if you’re never going to be using peak power for a sustained period of time it’s probably OK, but the cable isn’t that expensive either. I have 2 separate cables fpr a 4070 not 3 though.
It should work fine but I wouldnt recommend it because for some reason the adapter that came with my 4080s would not latch on to the gpu no matter how much force I would put on it. It would cause my monitors to lose signal and the gpu fans to max out, requiring a reboot. Went away when I bought a 12vhpwr cable from my psu manufacturer and it actually clicked in place with barely any more pressure then a normal 8 pin pci cable.
If your screens turn off and the gpu fans start spinning, it’ll be that adapter.
Those are the equivalent of “you know that burger place is going to be expensive black gloves” of the PC assembly world
Hope they’re nitrile gloves and not latex 😅
.
I have the same card, researched this same question and luckily I had purchased a new PSU so it wasn’t an issue plugging in that 3rd cable.
Although it is annoying to have these 3 cables feeding in coming from an older GPU where I only needed 1.
Cable management is now looking ugly near the GPU.
You need three direct cables from the power supply no piggyback. You will not supply the GPU with enough power otherwise
It’s a fire hazard.
As much money as you’ve already spent, stop being cheap and just buy the 12vhpwr cable from Corsair.
What’s in the instructions? Surely the manufacturers know better.
That’s how I’ve got my 7900xtx red devil set up since my psu doesn’t have another 6+2 and it’s perfectly fine playing dragons dogma 2 at 4K
Looks fine
Well I’ve been doing this exact thing with the same psu on a 4080 for almost a year and it’s been fine so I’m going to go with you’ll be fine 😀
Your PSU should have come with an extra cable. Do not chance it and have your pc burn
Corsair sells 12vhpwr cables that plug directly into their PSUs, and they come in white which matches your build and would look way cleaner than the pigtail. But you can use the pigtail if you want. 4080s draws max 320w total and you get 75w from the board connector, so that’s 245w total from the 2 cables, well within spec.
I mean… what did the infograph on packaging of the adapter say?