Question Powering GPU riser with Y Splitter on one PCIe cable


May 12, 2010
I'm currently mining RVN on an RX 480 Nitro 8GB and I am wanting to add my RX 470 (120w). My PCIe cable has another connector for another card (PSU is not modular). The only way I thought I can run it while waiting for the new PSU is to use a splitter as the PSU cable length isn't enough to reach outside the case. I have done a diagram (I got really carried away) of how I'd like it setup if it's possible to do in a safe manor.

My build is very basic while I am learning the ropes and I've got...

  • Sempron 2600+
  • 4GB DDR3
  • RX 480 (150w)
  • 850W PSU
  • 3 140mm fans
  • 4 USB devices.
The 480 is overlocked and undervolted to 90mV and I'll also undervolt my 470. My other question in regards to the PCIe cable is that I know they are 300w and both GPU's at max output would be 270w so am I right in thinking it would be safe to hook up the 2nd card via a Y-Splitter?

Diagram: [](


If the PSU PCIe cable length isn’t long enough to reach outside the case. Use a PCIe extension, not a splitter. The shortest possible. The heaviest gauge you can get.

You don’t list the PSU make and model. So I don’t know if it is a POS. But any decent 850w PSU should have three or four PCIe lines. I used two 850w to run nine cards. Back when I mined.

An 8pin PCIe cable is rated for 300w. A Y-splitter might work. But I don’t like adding more lines to a cable than it was designed for. You never know how shoddily it was built.

The diagram didn’t load.