Nice to see 980 Ti still stomps everything, glad I bought one... a wise investment!
I grabbed a Ti as well since I was sick of waiting any longer. Would like to see how the Furry X competes though. I find it strange that we get Furry X made for 4k, but only has 4GB of RAM yet they give the 390x 8GB? I am also hooking up the ti to a 4k TV so the lack of HDMI 2.0 in all of these cards is a deal breaker.
It depends on manufacturer, as I said in another comment.
Just like how Sapphire was one of the only companies who put 8GB RAM into the R9 290x(not the 290x2, but the single edition. 8GB usable VRAM), the Furyx will likely have at least 8GB, maybe even up to 12GB of VRAM, depending on the manufacturer.
I'm betting Sapphire's versions of the cards will run the best. As they always have.
Sapphire & XFX have always been the high performers for AMD cards. I've always found MSI AMD GPU's to be extremely sub-par, pathetic in some cases.
Keep in mind, just because the architecture is AMD's, doesn't mean everything is. GPU's(at least AMD versions), typically have different volumes of VRAM, clock speeds, etc. Even cooling.