Review on 💻 12-inch PWM Fan Splitter Cable - TeamProfitcom Braided Y Splitter Adapter for Computer CPU Fans - PC 4 Pin Fan Extension Power Cable - 1 to 4 Converter by Jeff Kersey

This is exactly what you need. It can be connected to the CPU fan connector if you want to keep all 4 fans in sync with your CPU temperature, or to the system fan connector if you just want them to run at full speed all the time (for standard case fan operation). ). The loom they're wrapped in is great and blends seamlessly with most PC aesthetics. The ONLY complaint I have is that the hub that includes all the plugs can get a bit unwieldy with all the wires coming together in one plug and this can make it difficult to route/connect in hard-to-reach places. However, once you receive it, it works as expected.