Type 3 vs Type 4 PCIe corsair cable differences

Posted by Otherwise_Rise2624@reddit | buildapc | View on Reddit | 2 comments

I recently bought the Corsair RM650 PSU. I have a RX 6700 XT GPU which uses 2x8 pin power connectors (recommended PSU of 650W). I am wanting to double check I have the correct cables to avoid frying any parts.

A PCIe cable came with the PSU (the cable on the left in the picture) which is daisy chained, I think this is a type 4 cable. The recommendation for the GPU say to not use a daisy chain so I bought a type 3 cable (the Corsair website says type 3 and 4 are the same for the PCIe and both are compatible with the RM650). This is the cable: https://www.corsair.com/us/en/p/pc-components-accessories/cp-8920130/type-3-flat-black-ribbon-cable-pcie-6-2-pin-single-connector-compatible-with-all-type-3-pin-out-psu-cp-8920130

The end that connects to the GPU is the same however the end that connects to the PSU is different, I have circled this in the pictures. The cable that came with the PSU has no wire in pin 7 while the type 3 cable has no wire in pins 4 and 8. This confused me as I was expecting them to be the same (as the website suggests), will the type 3 cable be suitable for powering the GPU? Is the cable that came with the PSU a type 4?

Thanks

https://content.invisioncic.com/p313717/monthly_2024_11/2_cables_labelled.jpg.0749428931d149df0226a1ac1326ab5c.jpg

https://content.invisioncic.com/p313717/monthly_2024_11/GPU_end.jpg.d9ed2d276e8e7598efaa63caab04fe0b.jpg

https://content.invisioncic.com/p313717/monthly_2024_11/PSU_end.jpg.4656f7897fbf06d6d4b8a793994452af.jpg

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Otherwise_Rise2624@reddit (OP)

For anyone that is looking for this in the future, I was able to contact Corsair and they said:
The cable that came with the PSU should be a type 4 (the only indication on the cable is a number 34-0 00263).
Although the pins at the PSU end are different for the type 3 and the type 4 cables they should both be fine for powering the GPU.

They did also say that the type 4 cable, being the new standard, should be more stable.

kaje@reddit

8-pin CPU = 4 12V and 4 ground pins

8-pin PCIe = 3 12V and 5 ground pins

The 8-pin ports on the PSU can be used for either type of cable, but matches the pinouts for a CPU connector. One of the 12V pins is empty in a PCIe cable, it doesn't matter which one.