(Redirected) Small RAM upgrade question for Alienware Aurora R5

Hi! I currently have an Alienware Aurora R5 with 2 x 4GB 2133MHz RAM sticks and am really happy with it so far!

But I would like to add another 8GB 2133MHz stick to bring it up to 16GB, thing is, I'm not entirely sure if I can just slot another 8GB stick into the XMM3 slot and have it work,

partly because i couldnt find any documentation on what the voltages/timings/cas latency are on the 2 4gb ram sticks in the pc currently are, and I think those are important to upgrading ram,

And because of this thing i found in the online manual for the R5

http://www.dell.com/support/manuals/ca/en/cadhs1/alienware-aurora-r5-desktop/Alienware-Aurora-R5-SM/Procedure?guid=GUID-9CDAAC5B-FD7F-4ED1-8E02-BB775E5387FB&lang=en-us

Seems to say that there are only  5 configuration's I can have, is that set in stone or is it just what they've tested?

Thanks, Saucybagel :emotion-1: