Should I get the RX Vega 64 or GTX 1080?

[Scisca]

Pemalite said:

Well no. I don't think you comprehend how GPU's work.

If you are limited in another part of the pipeline, then of course the difference will be reduced as that would be your bottleneck.
The Fury and Fury X had the same ROP capabilities and had the same Geometry capabilities... And was extremely limited in VRAM.
Which means... If the game was ROP, Geometry or Memory intensive, then performance would equalise.

But throw a compute-only task that only stressed the shaders, then you will see performance between the two start to spread apart.

Vega however has the same Shader count as Fury, but dials up the clockrate, has overhauled ROPS, Geometry capabilities, doubling of RAM and the introduction of new techniques which further increases memory bandwidth and Geometry/ROP throughput. It's not going to be apples to apples.

In short. It's a difference beast and we should wait on benchmarks from the likes of AMD and then possibly revisit this discussion if you so desire.

Cool story bro.

Fury X vs Fury - 3%
HD 7970 vs HD 7950 - 3-5%
R9 380 vs R9 380X - 1-3%
R9 390 vs R9 390X - 3-5%
RX 470 vs RX 480 - 3-5%

It's been a thing for AMD for generations that cutting down CUs doesn't impact performance as much as one would think. I think it's legit to expect the same story repeating with Vega, especially since despite the fact Vega 64 launches today and Vega 56 in almost 2 weeks, AMD told reviewers to focus on 56 - they know what people are gonna buy. Obviously, nothing is granted before we see the benchmarks, but Vega 56 card has the potential to be a Vega 64, 1070 and 1080 killer. IF! If it doesn't powerthrottle and run lower HBM voltage. The much lower TDP of Vega 56 may indicate that the voltage is lower and it would be a bummer if that happened, since for Vega cards memory clock matters a lot. HBM clock is more important for performance than core clock (for Vega FE at least). The main issue will thus be, whether we have enough voltage to push memory back to full speed of Vega 64. If that's the case - the cards' performance in games should be basically indistinguishable.

Obviously, if AMD messed with the memory, like they did with RX 470 having worse memory, the gap will be more significant. All we can do is wait now, but I hope Vega 56 turns out to be epic