Run 2 GTX 660 SLI on one single power cable

[Zz_Bloody_zZ]

As I said in the title, I am about to buy one more GTX 660 to run SLI in my system.
The thing is the power cable I am using for the current card still have a slot for one more (660 requires 6 pin, the cable has 2x6-pin and 2x2-pin connectors)
So if I use this slot for the new card, is it bad? I am considering this cuz adding another cable doesnt seem nice to the case

Info current:
i7-4770
RAM 16GB
2 SSD
1 GTX 660 (gigabyte)
PSU : Corsair RM850 (all cables are from the RM850 box)

 

[Samsamproducts]

So your GTX 660 requires one 6 pin power connector, but your power supply has two 6+2 pin pcie cables? Thats perfectly fine.
Edit: Thats perfectly fune

 

[Zz_Bloody_zZ]

haha, thanks man

 

[Mousemonkey]

Be sure to check the cable regularly if you do give it a go, if the cable gets too warm under load bad things may happen.