RainStryke
I would recommend this kit:
https://www.newegg.com/g-skill-128gb-288-pin-ddr4-sdram/p/N82E16820232587
 The XMP profile is approved per the QVL list for your motherboard: Source

RainStryke
Just realized that. Never even really looked close since the time I was looking into X299 they were much more expensive than they are now. That board is built for high frequency overclocking, so a high end 64GB kit is probably your best route with that board. Your board has way more overclocking potential than my ASUS X299-E, but the cut down on the memory capacity is how you could get to 4000MHz+. Suck's that's the takeaway. You might want to look into getting one of those updated X299X boards from Gigabyte that support the extra PCI-E lanes on your CPU and you would get double the RAM slots.

RainStryke
Per page 136 of your motherboard manual states:

X299 Owners Manual (Page 136)
System does not POST, and POST code indicator reads “55” or “b7” A POST code error reading “55” or “b7” indicates a memory issue. Verify that memory is installed, and that is it properly seated. Make sure that the memory is on the official support list (Page 36) or at www.evga.com/support/motherboard and click on “EVGA X299 DARK.” If the memory is not on the list, it may still work because EVGA is unable to test every memory kit released. However, this motherboard will not support modules over 16GB or ECC/Registered RAM.

Unfortunately it looks like the motherboard is your limitation here.
 
Kind of silly since the product page states it supports up to 128GB @ 4000MHz+

 
Looks like they messed up and over marketed versus the owners manual. Page 4 of the owners manual states:

X299 Dark Owners Manual (Page 4)
EVGA introduces you the ultimate in raw performance for the next gen Intel® Extreme lineup, the EVGA X299 Dark. The Dark is crafted from the ground up to be the performance apex with everything you need to make a recordbreaking benching run or a 24/7 number cruncher, and nothing you don't – a board that is as reliable as it is fast. The EVGA X299 Dark has all of the current gen top-tier component support, multiple M.2 slots, Intel® Optane™ support, multiple U.2 ports, up to 64GB of 4000MHz+ (OC) Quad-Channel RAM on a Skylake-X or up to 32GB of 4133MHz+ (OC) Dual-Channel RAM, dual Intel® GbE LAN, USB 3.1, and a full-featured GUI UEFI/BIOS.

ZoranC
One half of the kit (just 2 sticks in slots 2 and 4 for total of 64 GB) failed MemTest86. Now I am testing other 2.
 

chinobino.
Getting 128GB of non-ECC RAM in the form of 32GB UDIMMS to run error free is a pretty big ask of your CPU memory controller and chipset.
 
I would recommend testing with Intel i9-10900X JEDEC standards for socket 2066 first e.g. 2133 MHz, 2400 MHz, 2666 MHz and finally 2933 MHz if using a max of 1 DIMM per channel, which the x299 Dark is limited to anyway.
 
I presume your RAM only has JEDEC profiles up to 2666 MHz and not 2933 MHz?
 
If you can get to 2666 MHz error free using SPD (Serial Presence Detect) then you will need to test the XMP profile at lower frequencies such as 2800 MHz and 2933 MHz before you attempt their rated XMP clock speed of 3000 or 3200 (depending on which kit you currently have).
 
Note that timings are going to be crucial to running error free and you may need to loosen some.
 
I would first look at tRFC and add anywhere from 100 to 300 clock cycles to the SPD value (if testing JEDEC speeds) or to the XMP value (if testing above 2666 MHz).
 
Other timings that may cause problems are tFAW (try maxing it out first and if it passes bring it down in increments of 5 to find where it fails) and tCWL (try increasing in increments of 1 up to the value of CL).
 
If you can't pass 2400 MHz or 2666 MHz you may need to look at adjusting your tertiary timings. If the tertiary timings are too tight the IMC (Integrated Memory Controller) may be the cause of the errors.
 
A good way to check the IMC is to run test 6 repeatedly in Memtest86.
 
You may also need to check your RTL's (Round Trip Latency) for each DIMM socket, they should not be further apart than 1-2 (memory controller) clock cycles.
 
Every time you reboot and the motherboard trains the RAM there is the possibility that the RTL's may fail to be set to suitable values, it is always a good idea to check them before you run any long term RAM stability tests.

ZoranC

ZoranC

ZoranC
One half of the kit (just 2 sticks in slots 2 and 4 for total of 64 GB) failed MemTest86. Now I am testing other 2.

 
Second half of the kit passed 4 passes (12 hours) of MemTest86 without single error. Now I am testing all slots populated using 2 sticks that passed test from 1st kit together with 2 sticks that passed test from 3rd kit (2nd kit didn't work, period).
 
Note: 1st and 3rd kit are same part number that is 3000 MHz CL15. 2nd kit is 3200 MHz CL16.

 
Four stick "kit" combined from two sets that passed initial tests also passed 4 passes (17 hours) of MemTest86 without single error. Now moving onto Google Stress App ...

chinobino.
Looking good, I hope the Windows tests pass and you can finally move on to using your PC.

jasoncodispoti

ZoranC
Second kit was 3200 MHz. For that one I came to conclusion it just isn't compatible. Third kit is exactly same part I ordered first time that arrived with one bad stick.

What happens if you dont have XMP enabled? If the RAM is running at 3200 MHz than its overclocked.

jasoncodispoti
In an ideal world XMP profiles are stable and work... however in some cases they are just not. ASUS motherboards are notorious for not working correctly with XMP profiles... Those "bad sticks" may not actually be bad at all; Would be interesting to see what happens if you installed them back into the PC and disabled XMP and ran them at 2133MHz. 

ZoranC

ZoranC

ZoranC

ZoranC
One half of the kit (just 2 sticks in slots 2 and 4 for total of 64 GB) failed MemTest86. Now I am testing other 2.

 
Second half of the kit passed 4 passes (12 hours) of MemTest86 without single error. Now I am testing all slots populated using 2 sticks that passed test from 1st kit together with 2 sticks that passed test from 3rd kit (2nd kit didn't work, period).
 
Note: 1st and 3rd kit are same part number that is 3000 MHz CL15. 2nd kit is 3200 MHz CL16.

 
Four stick "kit" combined from two sets that passed initial tests also passed 4 passes (17 hours) of MemTest86 without single error. Now moving onto Google Stress App ...

 
One hour run of GSAT returned no errors. I will repeat it later for longer duration but so far this is encouraging.
 
Moving onto HCIMemTest ...

jasoncodispoti
... but have read reports on Reddit that Intel for example views it as overclocking as well and any subsequent damage to the CPU as a result of XMP profiles would not be covered by the warranty. 

RainStryke
Enabling XMP does technically void your warranty.

Intel
Does Use of Intel® Extreme Memory Profile (Intel® XMP) Void the CPU Warranty?


Enabling and use of Intel® XMP is a type of overclocking1, and will ultimately void the CPU warranty. Altering clock frequency or voltage may damage or reduce the useful life of the processor and other system components, and may reduce system stability and performance. Product warranties may not apply if the processor is operated beyond its specifications. Check with the manufacturers of system and components for additional details.

Source

--
As someone who has gone through the RMA process with Intel, it's going to be pretty hard for them to tell if you were using XMP.

ZoranC

GTXJackBauer
Just purchase the Intel Overclocking Warranty for your intel CPU.  It's really not that much and worth it imho.

Wow! I wasn't aware this exists. Thank you for sharing it!