AR has a lifetime warranty
KR has 3 years limited warranty
And of course they will work together in SLI.
I'm starting a new build with 1 1570-AR and am getting a 2nd 1571-KR as a gift for my SLI config.
Didn't think it would be a problem but as I didn't know what the difference was in the Mfr model #'s, just wanted to make sure.
New to this forum. Thanks for your help.