Mixing a Single rank and Dual rank memory Help!

[Athemos]

Hello!

I bought an additional 8gb of ram to my pc which is : https://www.kingston.com/datasheets/HX424C15FB2_8.pdf
And I currently own : https://www.kingston.com/datasheets/hx424c15fb_8.pdf
When we look at the stats they are identical exept the ranks.
I have done some research that they might work and they might not then I have question how could I try it I've tried to add them both in at the same time it started the boot loop when I took out my old memory and replace it with new one it still started the boot loop. I sent memory back into the store they tested it on few pc-s and told me it's working fine. What are they ways I could get them working together?
Any help would be awesome!

Pc stats:
i7-5820k
gigabyte x99 ud3
Gtx 980

 

[Calvin7]

Memory is guaranteed in the form sold and there are no guarantees for any other combinations that you happen to come up with.

Try:
DDR4-2133 CL14-14-14 @1.2V
DDR4-2133 CL15-15-15 @1.2V-1.35V

I don't think you'll be able to run slower than 2133MHz.
Supported memory for i7-5820K : DDR4-1333, DDR4-1600, DDR4-2133

There are no guarantees combining identical modules that are sold as singles will be compatible together when combined in multiples.

 

[Athemos]

My memory runs at 2400 mhz by default.
Maybe there is something to do with some options such as Rank interleaving or Channel interleaving or X.M.P?
I have no experience with this stuff and I can't really afford to buy another set because 1 stick is worth like 100 euros here would be pretty big money loss for me.
I can see alot of people asking about the same thing is there a way I could get them working if I insert another memory it wont even make to bios it starts restart loop.