Review on Black Sleeved CRJ Dual Fan Splitter Adapter Cable for Graphics Cards with 4-Pin PWM GPU by Bill Roberts

It does what you need and expect from it. Nothing more to say. If you're looking for one of these, try modifying your GPU for efficient cooling with an enclosure or a dedicated AIO fan. Don't worry, as long as your graphics card uses this connector, it will work just fine. Used this on Nvidia RTX 2080 Super (MSI Ventus OC) and everything works great.