[SOLVED] 12-Pin GPU Cable - Will it work with my PSU ?

Solution
In the page you linked, the cable says:
The CORSAIR 12 pin GPU Power Adapter Cable connects any Type 3 or Type 4 CORSAIR modular power supply

Down at the bottom has a link to the compatible power supplies. If I read that correctly, your RMx is compatible with type 3 and type 4.
In the page you linked, the cable says:
The CORSAIR 12 pin GPU Power Adapter Cable connects any Type 3 or Type 4 CORSAIR modular power supply

Down at the bottom has a link to the compatible power supplies. If I read that correctly, your RMx is compatible with type 3 and type 4.
 
Solution