I'm finally building the windows binaries of the new CPU-miner. After that I'll try to improve the performances

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For who said that GPU version is always better. Maybe this is the case, maybe it's not. It depends if and how much the code can be parallelized.
I'll try to see what CPU can achieve. And if it's not enough, I'll study the convenience to mix CPU and GPU, if I'll see that some algo cant be well parallelized on the GPU
So here's an interesting note:
Core i7-4670K gets about 410KHash/s on DRK while using around 77W
R9 290X gets about 2000KHash/s on DRK while using around 225W (?)
Clearly the GPU is faster and more efficient, but we're only looking at a different of about 40%. Unless someone can get a speedup out of the GPU miners to the point where it's more like 1000% more efficient, CPU mining should remain viable. Just my two cents. :-)
What's more, if you were to throw an R9 290X at DRK and get 2MHash/s, you'll generate roughly 0.02 BTC per day. If you throw the same GPU at something like VTC, you'll generate roughly 0.02 BTC per day. And currently mining MAX (whether you like the ideas behind the coin or not!), you can get around 0.02 BTC per day. If tons of people shift to GPU mining DRK, difficulty will go up, rewards will go down, and suddenly one of the other alt-coins will be more profitable. I suspect we're going to see some big fluctuations in difficulty in the near term on DRK as people jump on and off the bandwagon.