More hopefully thinking on my part if either of them was 8/8 I wouldnt have any questions about what card i was buying. So stressed at which cards i should get atm.
What do you want and is money no object.
I did the calculations pages okay and the reality is all cards will boost to 1450mhz. Including reference. So if money no object get the hydrocopper. Best warranty and comes prefttied with full cover block. Best warranty.
Sli and not using water get reference evga As they warranty cooler removal if you change your mind about water.
Not going water but money no object get gigabyte g1, msi gaming, zotac extreme or galaxy hof, evga classified depending on what warranty you want. All are 8+8 pin.
if it was me i would seriously consider if the 8+8 pin giving about 50-80mhz more overclock is worth the extra £80+
Depends on your finances and thats your business.
If you tell us what your want to do with the card we can better advise also what case you are putting in.