Do i need an rgb controller or can i just plug one of these into an rgb header on my mobo?

Your preference I think, but depending on what rgb device you are using you may get more customizability with a controller (which, I think most of those use a usb header on the motherboard?) If you use the rgb header on the mobo you can control the rgb devices through the mobo software, instead of using a separate controller. But Corsair devices probably work best with a corsair controller, that brand has its own software too.

How do i know when i need a rgb splitter? my mobo is gigabyte z390 ud and i want two rgb led strips.

If you are not going to be using a controller hub, and the total number of LEDs is under 300 per RGB port on your motherboard then you can use it like a extension cord of sorts. If you have more than one RGB port you can have the 2 strips on one port, and your fans (or heatsink RGBs) on the other port(s) with RGB Fusion you can select different colors to the different ports.

I have a MasterLiquid ML240R RGB. Could I plug the water cooler and the 2 fans from the radiator into this, then just simply plug into RGB Header?

Hello Mike, The 240R is an addressable RGB unit. You can use this splitter and plug in the fans and pump into it, then plug it into an ARGB header. It won't work with a standard 12vdc 4 pin RGB header; ARGB and RGB are not the same technology. CM-PNguyen

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Specifications

Brand	Cooler Master
Connector Type	4-pin (12v,g,r,b)
Cable Type	Lightning
Compatible Devices	PC
Special Feature	LED Display
Recommended Uses For Product	Connecting and extending RGB LED strips fans
Color	RGB Splitter Cable
Connector Gender	Male-to-Female
Shape	Flat
Number of Pins	4
Unit Count	5 Count
Item Weight	37 Grams
Indoor/Outdoor Usage	Indoor, Outdoor
Maximum Voltage	3E+2 Volts
Outer Material	Polyvinyl Chloride (PVC)
Manufacturer	Cooler Master USA, Inc.
UPC	884102032554
Global Trade Identification Number	00884102032554, 04719512059890
Standing screen display size	5 Inches
Item model number	R4-ACCY-RGBS-R2
Item Weight	1.31 ounces
Product Dimensions	22.83 x 0.25 x 0.3 inches
Item Dimensions LxWxH	22.83 x 0.25 x 0.3 inches
Voltage	12 Volts
ASIN	B0719QY63M
Is Discontinued By Manufacturer	No
Date First Available	June 13, 2017

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