A long while back I'd started discussion of how ASUS` customer service is atrocious--to say the least. *They'd ended up giving me a Rampage3Extreme as compensation, due to technicalities. Ad much as I'd insisted against it, not wanting to have to replace both my CPU AND RAM Modules just to be able to even (sufficiently) bench-test it...
...
...*welp* LongStoryShort: iWent ahead and equipped it with a 360mmRadiator+intel's-i7_990X and slapped some TriChanel 2000MHz (12GB),, thinking tri-channel @ 2000MHz (*12GB) would be the better way to go about configuring the build, as well as potentially{*} leave room for over-clocking (if need be).
...
*PLEASE*
I have been trying my utmost in research of this "build" AND there's only so long a window remaining to return any potentially defective{*} component / etc.
Currently I have the MoBo equipped with CMT6GX3M3A2000C8 Corsair Dominator,, and am curious if switching out to a 24GB DC-moduleSetup would prove superior -- among other things.
**Help?**

Thanks.

I read the whole thing, but it was just a rambling story. What is the question?

*To clarify:
For the sake of potentially over-clocking, and primarily powerhouse-server orientated work, would 24GB of RAM @ CS:~11~ / 1600MHz be the optimal configuration for the MoBo+CPU,, -OR- would utilizing modules capable of exceeding 2000MHz (CS:~9~), though sacrificing storage{*} (12GB vs. 24GB)?
...
Depending on the average work-load, more is better (in terms of Storage/Utilization)... ...wouldn't the faster{*} modules, with better clocks{*} be the better-est solution?
...
Or, for this particular build[motherboard]; would a Dual-Channel RAM configuration--greater capacity{*}, slower clocks{*}--versus the optimized{*} Triple-Channel setup?

*[EDIT/UPDATE]*:
The board itself has been somewhat finicky. I'm not too certain whether or not it's that it's defective, or some of my "bench-test" equipment may be (*no real separate bench-test equipment, unfortunately ... just recently acquired components--leaving me suspicious).
Finally in the O.S., the only thing I've done for confirmations, was load up CPU-Z. Almost everything was operating optimal, thankfully--except for the audio. **only after equipping it with a GPU, featuring integrated Audio, had I successfully "finished" the build.
...hoWever... While I did adjust the "auto" config. in the BIOS, to operate @1866, CPU-Z shows some different settings...
**also,, without manually tweaking the timings/etc. and configuring it in an "XMP" format, I won't be able to get much else functionality out of my current modules (than that of 'auto' [max] 1866)?

<<<ThanksAgAin>>>

Unfortunately, I cannot for the life of me locate any Triple-Channel Modules greater than 12GB ... even the ones featured in the motherboards QVL (for RAM). I only was successfull in finding one vendor with a stick as mentioned via the list... but America won't let me access foreign websites... >.<

*iGuess[then]*,myQuestion-is:
Should I stick with >2000MHz Tri-Modules (~cs:9~) @ 12GB
-OR- Switch to a Dual-Channel Module (~cs:11~) @ 24GB
...
?

https://www.newegg.com/Product/Product.aspx?Item=N82E16820145350
 
or
 
https://www.newegg.com/Pr...x?Item=N82E16820231359

If I am leaving everything on "auto" (CMOS-Reset/w.e.),, and the system ... still iffy about loading... when finally does, reports all informations correctly... ... however, the RAM speeds always default to 1333,, or else the machine idles at the POST image (taking a good handful of seconds to count up 12GB of RAM)
...
Repetitiously rebooting the system (&pressing CMOSReset everyNow&Again) gets it into the O.S. ... ...there are a series of lights (feedback) just near the primary 24-Pin Power Adapter.
When it's idle at the POST, the "BOOT DEVICE" light remains on. Because of both this, as well as integrated audio difficulties, I am left suspecting the SB-chipset(orSomethingthereabouts, with the board) may be defective{*}.
However,
When having had manually adjusted anything with attempt of optimizing the build (nothing severe, still leaving CPU in 'auto' & RAM to XMP), after rebooting: the CPU light then flashes repeteadedly... >.< ...until, of course, it defaults and re...
But, leaving everything 'auto', and attempting at setting a default parameter, for the RAM, of 1866... reboot: DRAM light now flashes repeatedly, until system restores/reboots/{*}/...
Is it possible that the "errors" may be Entirely(?) MoBo related?
***
The only time(s) I successfully log into the O.S. is if/when it finally prompts me, F1-BIOS,, F2-Defaults&Continue

For server orientated work 24GB's is definitely going to be better. Your issues may be coming from running the ram above 1066MHz as the 990x is only rated to run 1066MHz ram.

990x is the best you can get for that board. Yeah, you may have to settle for slower ram.

Yes. No problem.