CPU PSU connection question

[Daveeede]

I am building a rig for a friend. It includes:

 

i7-6800k

Asus X99-M WS Motherboard

EVGA 650 G2 Power Supply.

 

The motherboard has two 8-pin CPU power connectors. Now what I understand is that you only need the second one if you are doing heavy overclocking, but this is unclear in the user's manual. My friend will most likely run at stock speeds AFAIK. 

 

The PSU has one CPU cable with a 4+4 pin connector at the end. But in the box I found what appears to be an 8-pin to 2x8-pin adapter labelled CPU. It is not mentioned in the user's manual, and is inconsistent with what I've read online. What I read online (in a JohnnyGURU review) is that the CPU cable originally had a break-out with one end being an 8-pin connector and the other end being a 4+4 pin connector.

 

Is it possible Evga changed their cables for that model? 

Should I ignore the adapter and just use the 4+4 pin connector and call it a day?

Wondering what you guys would do here.

[Godlygamer23]

you're fine using a single 4+4 connector. 

[Moderateshadow]

just use the 4+4 and youll be fine. if you start to OC than use the other one.