You want the ek 780 classy water block. It will fit your evga 1080 classified. There the same pcb.

I'm using 2 ek 780 classy wb's pn mine. There's a thread here somewhere with picks were a few figured this out.

Gl finding one in stock!

http://www.performance-pcs.com/ek-fc780-gtx-classy-nickel-24786.html

There's 1 in stock!

Also the thermal pads provided fit perfectly. So the same instructions used for the 780 are the exact for the 1080 classified.

The original backplate can only fit if you find and use different screws. Or you can buy the back plate ek made as that would work.

Thanks for the information AHowes, it's a nice setup you have. I'll have to wait and see what comes around, it's that or sell my card and get something with more options for cooling.
 
Thanks for the welcome to the forum bcavnaugh and I was hoping for something Official, as its not a cheap card.... it's a waiting game :(
 
Thanks

You never know, might have a play :D
 
Thanks

My last Step-Up took about 7 days to complete, this was about 2 weeks ago.