Strimer Plus V2 8-PIN and 3×8-PIN only supports a 5V ARGB header to motherboard, but the motherboard doesn't have enough 5V ARGB header.

Please purchace a exclusive controller box (included in 24-PIN as well), if there is no need to sync lighting effects to motherboard, don’t need to connect the 5V ARGB header to the motherboard.

How many extention cables can be connected to the controller?

One controller only supports 1 motherboard cable (24-PIN) + 1 GPU cable (8-PIN or 3×8-PIN)