bob16314
If you have the extra connectors, adapters such as "Dual SATA to 6+2 pin PCIe" and "Dual Molex to 6+2 pin PCIe" and "8-pin EPS12V to 6+2 pin PCIe" are widely available..Search around.

Interesting, and thanks for your quick reply.
 
You said "adapters" but my search with your terms resulted into full cables.
Are you suggesting to replace the original EVGA cables by those above *OR* to connect adapters similar to above to my original EVGA cables??
 
Following your hints, I have just bought the below which I suppose is what you meant.
It costs less than 2 bucks so I bought one anyway to test.
On the 2nd picture is the brand-new adaptor plugged to my EVGA original cable, which in theory should work perfectly in the situation I described.
 
BUT... a weird observation though: the 6 pin connectors are supposed to have 2 phases while the 8 pin connectors 3 phases... so how the 6pin here comes out with 3 red wires out of it? I expected to see a jumper on the 8pin side to feed the missing phase. Should I be concerned about this?
 

An 8-pin from the PSU branching off into a 6+2-pin and a 6-pin with a 6-pin to 8-pin adapter..Hmmm..Probably be okay but keep an eye (and a feel) on it for signs of overheating.
 
You can use the cables that came with your unit and just buy the adapters that go on other cable ends too..There's Dual SATA to 6+2 pin, Dual SATA to 6 pin, Dual SATA to 8 pin..Dual Molex to 6+2 pin, Dual Molex to 6 pin, Dual Molex to 8 pin..Lots of various adapters around..Check modDIY or Amazon or FrozenCPU or other places.

Or you can get individual custom cables from CableMod, or Contact EVGA and see if they have what you want..EVGA sells individual cables upon request too.

See PCI Express Auxiliary Graphics Power Connectors for pinout and watt/amp ratings.

Buying custom cables from cablemod is the best choice.