The only thing I can suggest is, maybe you have to go with Evga only then so you can take hsf off and not void warranty.
Evga doesn't make AMD cards.
I think you're missing the point. XFX used to allow this and encouraged it... now they've silently stopped. Just like they did with the lifetime warranty.
I've got plenty of XFX cards.. the main reason i used to go with XFX was because i remove thier heatsinks and not void the warranty, and because of the lifetime warranty.
I have a 6970, 6950, a coupl 5870, a few 5850.. all of which i've put waterblocks on.
Normally these "Void Warranty if removed" stickers are just on the pcb... You were allowed to do aftermarket heatsinks, as long as if you had to do warranty repairs, that the boards were sent back with thier original heatsink fans (attached).
The Visiontek 7970 that i have does not have these tamper proof stickers on the retention brackets. When my sapphire 7970 and powercolor 7970 show up, i'll check the brackets on those to see if they have tamper stickers on them.
plus i'm not your typical computer user.
Distributed Computing
i'm #1 on TeAm Anandtech overall... i haven't DC in the last 6 months though and have lost my #1 status on a few of the projects.
running water allows for a more efficient computer and quieter. running fans at a low rpm isn't an option because of the extra heat generated... watercooling is the only logical option for running computers 24/7 under full load for heat and noise management.