Thank you very much for informative posts.
its one my box, and lets me say its limit to all what i can with but the mobo rock

Looks like a powerful setup, why so much ram, though? Gaming? I'm going to look into that mobo, but that is maybe a bit too expensive.
How in the world are you going to fit 5 GPU's in that motherboard? Do your research, the GPU's can only go in the blue PCI-E slots, and there are only 3 of them on that board. Remember spacing too, on my Sabertooth Z77 board with 3 PCI-E slots I can only fit 2 GPU's on it (GTX 670 and 5970 currently) because 2 of the PCI-E slots are too close together, another GPU wouldn't fit in.
Risers.
you're not going to get 5 GPUs on that motherboard without a bit of creativity.
You're going to need to look into PCIe riser cables to get access to those PCIe x1 slots. Once the main PCIe slots are occupied there's no way you'll get a GPU near that.
Yeah, that was my plan. I'm just scared, that the hash rate will suffer due the scaling. Well, worth a try, that mobo ain't a bad deal for 4 gpu either.