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Interesting. So, from what I see you replicated that power boost cable four times and feed power to PCI-E bus. But why four? Wasn´t only one enough?
I wonder also, is it vital to provide also the ground connection? All the powered riser I´ve seen are only using one wire (12V).
ill quote myself:
one of my 7 rig's , 1500kh :
i made more that 4 of that.not all for one rig lolz. I have >>7<< rigs. some rigs do not need it, some are better with two of them like this one from photos:
super old single core only asus mobo with pcie 1.0 and two dualcore 5970 eating some serious amps from slots.
no , ground is not crucial. since its shorted to pcie 6-pin grounds, current can go back that way. so you won't burn pci-e slot , and there is a s**tload of grounds at 24pin atx, so you won't se that burnt either . but its safer and helps a little to have it anyway.