This extension cable only needs to connect 4 8pin to convert it into 12+4pin, which is simple and safe to power the GPU. It is recommended to use a power supply above 1000W for better and more stable performance. Note: Do not use PSU 8 Pin to Dual 6+2 Pin PCIE power cable as two connection ports to avoid overload power supply problems. We recommend using 4 PCIE power cables for better and more stable performance. PCIE 5.0 extension cable uses 16AWG tinned copper wire, compared with 18AWG cable, this can bring more stable voltage transmission and higher power output, this 4090 extension cable supports up to 600W output, if You are having a problem with insufficient red power light on your GPU, this would be a good solution. This 4090 4080 and 3090ti special extension cable can perfectly replace the original large and thick power cord, the computer case is more beautiful, equipped with a cable comb, allowing you to easily achieve clean cable management and unified design