No need to replace the power supply, just connect the 3x8pin module cable to convert to 12+4pin, simply and safely power the graphics card. The cable adopts standard UL1007 16awg copper wire, which can power your GPU very easily, if you encounter the problem of insufficient red power indicator of the GPU, this will be a very good solution for you. This 3090ti & 4000 series 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. This extension cable uses 16AWG copper wire, high-density flexible protective sleeve, woven nylon fiber, the product length is 13 inches, 100% new copper core, compatible with 3090ti and new generation 4000 series graphics cards.