No need to replace the power supply, just connect to the current PCI-E 2*8Pin module cable to convert to ATX3.1/12+4Pin cable, 5.0 PCIE extension cable designed according to the new generation standard, no signal loss, supports data link speeds of 32GT/s ,twice the speed of PCIe 4.0. The cable new mod ATX3.1/12+4Pin adapter is designed for RTX 5090 graphics card and supports 5090Ti and new generation graphics card 5/6000 series. High quality, excellent stability, use UL1007 standard cable, high specification wire easily handles your ultra-high power supply, perfect for 800W or up PSU. Recommend the 2x 8pin PCIE connect to PSU DC output with direct cable do not use daisy-chain connector to it. Cable manufactured with 16AWG wires and come in a high-density flexible protective sleeve. The cable extension measure 10cm in length and equipped with combs for a clean cable management and a uniform design.