Hi, I have searched extensively on Amazon, ebay, etsy and custom cable manufacturers. All I am able to find is splitter cables. For example, this one, https://www.amazon.com.au/COMeap-Power-Adapter-Cable-13-inch/dp/B07HCYDK5K/ref=cm_cr_arp_d_product_top?ie=UTF8&th=1
The description suggests it will not work.
『PCIe 8P - Dual 8P(6+2)』PCIe 8 pin male end to plug into the power connector of Dell motherboard and two 8 pin(6+2) male ends (The 8 pin (6+2) ends could be used as 6 pin or 8 pin end by sliding on/off the 2 pin.) to plug into the video graphics card.(NOTE: the 8 pin end and two 8 pin(6+2) male ends cannot be used interchangeably);
I may be misunderstanding though…. could you clarify please?