AURORA R10 RYZEN EDITION - RAM UPGRADE

Hi everyone, I wanted to upgrade my PC as in object,

I currently have 2 of the 4 banks occupied by model 16Gb memories:

HyperX Fury DDR4 XMP 2933 MHz - P / N XRMWRN-MIE

I wanted to bring to 64 Gb OR always HyperX Fury DDR4 XMP but from 3200 MHz.

I therefore have 4 questions that I would like to bring to your attention:

1. In the first case I can't find the memories with that P / N on the HYPERX manufacturer's website, so I ask if they are specifically designed for DELL and if so where to buy them since they are not even on the DELL website.

2. In the second case, that is for 3200 MHz, I don't even know the P / N.

3. even if it were only slightly, it is more efficient to install 2 banks of 32 or 4 of 16 Gb.

4. in the DELL documentation there seems to be something that is not right because in the "Alienware Aurora R10 Ryzen_users_guide" on page 12 we talk about "memory per slot" 8 or 16 Gb, instead in the "alienware-aurora-r10-desktop_service-manual_it" a page 47 in the "Memory Configuration Matrix" it is also possible to install 32 Gb banks, which of the 2 is correct?

Thank you