[SOLVED] CX750M powering a 3080 GPU - cable help needed

[bradenthefirst]

I have an EVGA RTX 3080 FTW3 Ultra graphics card, and want to power it with a CX750M PSU. From what I have read, that should be enough power, but I have a question with the PCIe power cables.

The 3080 model I have has the following listed for power requirements:

• Minimum of a 750 Watt power supply.
• Three available 8-pin or 6+2pin PCIe power dongles
• Total Power Draw : 320 Watts

The CX750M only came with two PCIe cables in the packaging. Both of the cables have one 8 pin to go into the PSU, and two sets of 6+2 on the other end making a "double end", so I guess technically I could plug that into 4 ports, but not sure if that is what I should do.

Do I need 3 separate PCIe power cables running directly from my PSU to the GPU, or can I use one of the "double ends" to make it work?

Thank you! Want to start the build tomorrow but don't want to damage the new 3080.

 

[ezskills]

Do not use split power supply cables for GPU you need to use 3 separate PCIe power cables running directly from my PSU to the GPU to power your GPU right.

 

[RTX 2080]

From what I've heard, the CX-series PSUs from Corsair aren't very good quality-wise and should be avoided, especially for a GPU as expensive and power-hungry as yours.

If the money is available, I'd recommend a new Corsair RM850x as a replacement PSU. The RTX 3080 not only has a high power draw, it has high transient loads that can trip the internal circuitry of less robust PSUs. If anything, Nvidia was conservative this generation in it's PSU recommendations and should have recommended and 850 watt PSU for the 3080 and above.

 

[Phaaze88]

You've got another problem: the CXM lacks the quality to handle a 3080.
For perspective, even RM-non X black screens and shuts off with loads under that gpu. You need at least a RMX or other equivalent for that gpu.

 

[bradenthefirst]

OK, Sounds like a trip to MicroCenter for a better PSU. Thank you all!