On Wed, 6 Jun 2018, Ben Koenig wrote:

The support pages for your memory and motherboard will always have this
information.

Ben,

  They don't have information about installing two pairs, each pair having a
different capacity; e.g., 4G and 8G..

Looks like for the 990fx the pairing is organized by same-color. So if you
have 1 matched pair of DDR3. You can slot them into the brown ONLY, leave
the other 2 slots empty and you will get the speed. Assuming the RAM is
paired. After setting up the pair in the brown slots, repeat for beige.

  I know the G.Skill series I have works with the motherboard.

Since the beige/brown slots are on different channels, you usually don't
need to worry about using the exact same sticks or sizes.

  Actually, on this board all four slots are black.

I'm looking at a PDF from ASUS as I write this that tells me exactly what
will work. Clearly the newegg techs have no idea what they are talking
about.

  T'wasn't a newegg tech, but one employed by G.Skill. The newegg page has a
link to open a chat with the vendor. When they wrote that putting a pair of
4G modules and a pair of 8G modules might work and only trying it would
determine the results I decided that investing the money in a pair of 8G
modules that might not work for me wasn't worth it. In any case, having two
pairs of 4G modules provide four times the memory of my current desktop
server/workstation and that increase is Good Enough(TM) for my needs.

Regards,

Rich
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