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Mixing Type 3 and Type 4 on the same (old) corsair RM 750

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Mixing Type 3 and Type 4 on the same (old) corsair RM 750

Hi,

I recently bought a used ASUS ROG Strix RTX 3090 24GB OC that I am yet to connect to the PC as I need an extra pcie cable. I have the corsair RM750 (part no.CP-9020055).

Apparently, there are two version of RM 750 and I have the older one (2014). A few days ago, I ordered a Corsair Individually Sleeved PCIe Cable Single / Type 4 - Svart before I knew of the existence of the two versions.

However, Type 4 and Type 3 pcie is supposed to be compatible according to this webpage:

https://www.corsair.com/us/en/explorer/diy-builder/power-supp...

Currently, I have an RTX 2070 Super connected to a single daisy-chain pcie cable( Type 3 I believe).

Now, what I am unsure of is if it is actually safe to have both Type 3 and Type 4 cable on the same PSU or if it would cause issues to the GPU in some way since we are connecting two different cable types.

Or should I just order another Type 3 cable from corsair just to be safe? I don't want to fry the GPU or the mobo as it is out of warranty!

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See Corsair's compatibility table:

Citat:

The only difference between Type 3 and Type 4 cables is the pinout of the 24-pin ATX cable; all other cables (SATA, PCIe, etc) are the same.

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Thanks, it mentions they are comptaible but it does not say if you can mix both at the same time especially that I am using the older pre-2019 PSU.

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Skrivet av Nickardo:

Thanks, it mentions they are comptaible but it does not say if you can mix both at the same time especially that I am using the older pre-2019 PSU.

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It doesn't say compatible, it says they are the same. There might be some superficial differences between them, but electrically they're identical.

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Skrivet av Nickardo:

Thanks, it mentions they are comptaible but it does not say if you can mix both at the same time especially that I am using the older pre-2019 PSU.

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i can recommend swapping PSUs, 750w is not enough for a rog strix 3090. i tried with a seasonic 750W PSU and it kept shutting down during load even at 80% power limit.

My rog strix 3090 draws 480w under load if its ran at 120% powerlimit.

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Dator : GPU: Asus RTX3090 ROG Strix |CPU: AMD Ryzen 7 7800X3D |
| RAM: Kingston Fury 32GB 6000MHz | Hifiman HE-500 | Musical Fidelity M1HPAP |

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Skrivet av HaBBarN:

i can recommend swapping PSUs, 750w is not enough for a rog strix 3090. i tried with a seasonic 750W PSU and it kept shutting down during load even at 80% power limit.

My rog strix 3090 draws 480w under load if its ran at 120% powerlimit.

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Some Seasonic PSUs had a known issue with the GeForce 3000-series due to a noisy 12V sense line that caused them to trip, so it might have been that issue rather than that 750W isn't enough.

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Skrivet av HaBBarN:

i can recommend swapping PSUs, 750w is not enough for a rog strix 3090. i tried with a seasonic 750W PSU and it kept shutting down during load even at 80% power limit.

My rog strix 3090 draws 480w under load if its ran at 120% powerlimit.

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480W! I better be upgrading soon.

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Skrivet av perost:

It doesn't say compatible, it says they are the same. There might be some superficial differences between them, but electrically they're identical.

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Thanks for this!

Just to understand how it works, I believe my older PSU is listed on the legacy page of the compatibility list (https://www.corsair.com/us/en/s/legacy-psu-cable-compatibilit...). The dots under the RM column mean that the PSU should be compatible with both type 3 and 4 - which means they both can be connected at the same time to power the GPU.

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Skrivet av Nickardo:

Thanks for this!

Just to understand how it works, I believe my older PSU is listed on the legacy page of the compatibility list (https://www.corsair.com/us/en/s/legacy-psu-cable-compatibilit...). The dots under the RM column mean that the PSU should be compatible with both type 3 and 4 - which means they both can be connected at the same time to power the GPU.

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Yes, you'll notice that all PSUs are either compatible with both Type 3 and 4 PCIe or neither of them. If mixing the cables would be an issue there'd be a big warning about it.

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