Review on Cooler Master PWM Hub: 6-Port Addressable RGB Lighting with PWM and Magnetic Backplane Splitter - 5V/3PIN RGB Case Fan Hub Adapter PWM ARGB Addressable Fan - Ultimate RGB Control Hub by Frank Nguyen

It's hard to find a PWM/ARGB hub that supports 6 fans and is so cheap. It's magnetic, so mounting it on a steel chassis is very convenient. It also works well with Gigabyte Fusion 2.0 and probably other RGB lighting control software as it uses standard connectors. A few notes: there is one control input for PWM and one for ARGB, which means all fans connected to the hub will be the same color and speed. So plan accordingly. Also, the ARGB connectors are a bit small. I had to cut off some of the plastic on my headers (Arctic P12 ARGB fans) to make them fit. Otherwise, this block is great if you want to control multiple case or heatsink fans at the same speed.