Deepcool DQ850-M-V2L 850W PSU compatible PCIE Cable

I am trying to find compatible 8 pin PCI-E cable for my Deepcool DQ850-M-V2L 850W PSU but unable to find any. The 6+2 PCIE cable provided with the SMPS has only 7 pins inside the PSU side connector, but the ones I get in the localstores have pins on all 8 slots.

Is there an alternate way to get the 8 pin cable working on my PSU?