GPU Choices ?

[epixoip]

lets take the NTLM for example, the 290x gives approximately 21 billion tries and the GTX 980 approximately 15 billion, what would the numbers be for multihash ?

Since you specified NTLM, here are some NTLM benchmarks:

Code:

Attack R9 290X GTX 980 Brute force, 1 hash 22957.6 21521.5 Brute force, 10k hashes 11489.4 12101.2 Brute force, 1M hashes 1986.3 3113.7 rockyou+d3ad0ne, 1 hash 5676.2 5974.2 rockyou+d3ad0ne, 10k hashes 4443.1 4737.0 rockyou+d3ad0ne, 1M hashes 1872.7 2879.1 rockyou combinator, 1 hash 8913.6 8759.8 rockyou combinator, 10k hashes 7345.0 8426.4 rockyou combinator, 1M hashes 1948.5 2840.7

GTX 980 easily keeps pace with -- and in several cases outperforms -- the 290X, even though it has 768 fewer cores and draws only half the power of the 290X.

like i said i dont care for the power consumption

You should. Power == heat. Heat is difficult to deal with, especially in multi-GPU setups, and especially if you buy OEM-design cards.

its a comparison between perf/price now,that is if i get 2 290x for the price of one 980 for example and i get double or better performance in the 2 290x ill go for 2 290x.

Sure, if money is a factor and you can actually power & cool two GPUs, then go for 2x 290X.