This connector

[Proprietary]

I somehow forgot what this connector does... Can someone quickly remind me what it is and how to connect it?

[Skiiwee29]

Looks to be for RGB to me, likely Corsair if my eyes serve me correctly. 

[Proprietary]

18 minutes ago, Genwyn said:

Looks like a female rgb header.

 

20 minutes ago, Skiiwee29 said:

Looks to be for RGB to me, likely Corsair if my eyes serve me correctly. 

How would I connect it to my motherboard?

[Oshino Shinobu]

19 minutes ago, Genwyn said:

Looks like a female rgb header.

Mr.Nitpick here, it would be male. Pins determine whether it's male/female, rather than the housing. 

[jGD]

That end likely plugs into either a device or a controller. The RBG headers on the motherboards are usually male.