I'm looking to water cool my Sapphire R9 270x. At first I wasn't going to water cool, but my friend decided to do it so I'm going to do it with him. However I haven't been able to find a waterblock for a R9 270x yet. From what I've heard, it's just a rebranded 7870. Will a 7870 block fit on a Sapphire R9 270x? Is the Sapphire version different than a reference version?