1080 TI - new best bang for buck?

[Flomac]

Unless the OpenCL preliminary benchmarks are too biased for AMD, like you are for Nvidia.

No one is biased for anything. The fact is AMD does not have a proper Hashcat GPU since years. The mighty power of the 290X came with a bunch of drawbacks. If you're doing cracking professional and not for fun, some of these faults were crucial. The watercooling of the Fury X made it impossible to put a bunch of cards in a server rack. And don't get me startetd about drivers and software.
That's why almost everyone here favors NVidia.

The sample tested producing the above result, clearly outperforming 1080 on every test but one and loosing by 1080 Ti is clocked at 1200MHz.

If that clock remains, we aren't talking anymore for 12.5 GFLOPS, but less.

The clock will not remain on 1.2GHz. AMD is doing a die shrink from 28nm to 14nm which is a huge step (actually it's two steps).
Die shrinks can be used for
- rising clock speeds
- rising transistors
- lowering energy consumption
- lowering die size

Let's roughly analyze the new GTX1080 compared to the GTX980. NVidia made a die shrink from 28nm to 16nm. A shrink down to 14nm would be a 4x favor. Since it's a logarithmic curve going from 28nm to 16nm results in a factor of ~3.2

- clock speed ~ 1.4x
- transistors ~ 1.4x
- die size ~ 0.8x (which is 1,26 square 2=1.6x)
- power TDP 1.0x

1.4 x 1.4 x 1.6 x 1.0=3.14x -> That's the factor of positive impacts in cause of the die shrink. It's very close to the predicted 3.2x


Compared with the Fury X the shaders of the Vega remain the same at 4096. Even if the shader logic is a bit more complex, it will not contain too many more transistors.

So doing the same calculation like above
- clock speed 1.5x (~1.5GHz)
- transistors 1.2x (~
- die size 0.8x (-> 1.6)
- power TDP 0.8x (-> 1.25)

1.5 x 1.2 x 1.6 x 1.25=3.6x -> even under the 4.0x resulting from the die shrink (28nm to 14nm)

So even with 20% more transistors (though shaders remain the same), a 50% higher clock rate, a die shrink and a 20% lower power consumption the above values can only be estimated as fairly.

And of course, everything can be still messed up. Screw up the cooling system and the GPU will "throttle like a motherfucker" (epixoip). Maybe the power drop needs to be bigger. Drivers can be crapped up easily. And so on.

And to answer epixoip: I'm not optimistic, just trying to be realistic with you being pessimistic about AMD, which I totally understand minding where AMD's floating around the last years