Hi guys, I purchased X299 Dark and i9-10900X and need to populate it with 128 GB. I know I saw somewhere on this forum post that lists 32GB module tested as compatible but now I can’t find it anymore. Does anyone has that link and knows which module it is, please?
 
Also, if I am correctly interpreting specs of CPU it calls for 2933 memory speed. I’ve read somewhere that “max memory speed for i9-10900X is reduced to 2666MHz when configured with two DIMMs per channel”. If I populate all 4 memory slots on X299 Dark will I have single DIMM per channel or I will end up with two?
 
Last, but not least, requirement on this system is ultimate long term stability under any workload or its duration. It is extremely important to me so I will not be overclocking CPU nor memory. With that requirement in mind which memory manufacturer / line is considered best, most rock solid?
 
Thank you in advance!

Cool GTX
This might be the Thread your looking for:  32GB memory support on EVGA motherboards

Intel i9-10900X
 
I like G.Skill RAM

Thank you! I don't think that's the thread I have in mind, one I had in mind was post by one of EVGA staff, but this is still helpful, thank you!

Cool GTX
Found this in the X299 section:  https://forums.evga.com/FindPost/2996842
 
(excerpt)
 
EVGA X299 Motherboards provide these features to support the New Intel^® Core™ X-Series Processors -

• All EVGA X299 motherboards feature support for 32GB DIMMs with the latest BIOS

 
https://www.evga.com/articles/01369/intel-x299-update/
 

Thank you! Yes, I am confident it supports it, question is which one has been tested as compatible and if I populate all four slots am I getting single DIMM per channel (I am guessing that I am but I want to make sure).

Cool GTX
This might be the Thread your looking for:  32GB memory support on EVGA motherboards

Intel i9-10900X
 
I like G.Skill RAM

FYI, Unless something has changed, 4 Weeks ago TiN indicated that the GSkill DIMMs will not work on the EVGA X299 Dark. Looks like OP is going to be limited to the Corsair Vengeance LPX 32GB DIMMs. 

Ignore. Can be deleted. 

LOL, I thought I was replying to one thread and after I posted realized that I was on the wrong thread. Thanks for the update on the RAM! Can you post links to the RAM that you ended up purchasing in case someone else comes along looking at this?  

May have to change the timing (increase numbers) to allow these 2 sets to work together

Four passes (~ 11 hours) of MemTest86 on first set of 2x32GB (serial numbers *121 and *122) in slots 1 and 2 didn’t return a single error.
 
Attempt to do MemTest86 on second set of 2x32GB (serial numbers *165 and *166) in slots 3 and 4 returned errors within minutes.
 
Four passes (~ 11 hours) of MemTest86 on first set of 2x32GB in slots 3 and 4 didn’t return a single error.
 
Attempt to do MemTest86 on second set of 2x32GB in slots 1 and 2 returned errors within minutes.
 
Four passes of MemTest86 on stick with serial number *165 from set # 2 in slot 2 didn’t return a single error.
 
Attempt to do MemTest86 on stick with serial number *166 from set # 2 in slot 2 returned errors within minutes for a total of 48 errors by the time test (4 passes) completed.
 
This makes me feel I’ve eliminated incompatibility/timings, memory controller, and memory slots as possible culprit and that everything indicates stick with serial number *166 from set # 2 is bad.
 
Which made me think what I want to do about it. Yes, I can go through RMA, replace set # 2 and try again but whole experience left me in no mood to deal with another possible setback, like finding that two working sets will play along fine once combined.
 
Before I found out memory I received is bad I’ve decided to build one more system based on X299 Dark and was planning for “only” 64 GB in it but after this I have changed game plan and ordered single Corsair 256 GB -3200 C16 kit:
 
https://www.corsair.com/us/en/Categories/Products/Memory/VENGEANCE-LPX/p/CMK256GX4M8E3200C16
 
Logic (of uneducated layman) behind it is:
 

1. If Corsair believes whole 256 GB kit should work fine in 8 slot mb with all slots populated then I shouldn’t have concerns will half of it work fine in 4 slot mb with all slots populated, compatibility of sticks and timings would be already good enough (correct?)
2. Even though I was avoiding going beyond Cascade Lake X’ call for 2933 MHz DDR4 3200 MHz shouldn’t be an issue.
3. Going from CL15 @ 3000 MHz to CL16 @ 3200 MHz shouldn’t result in any performance drop memory wise, it should end up in practical wash (correct?)
4. If all of that is correct then getting one 256 GB kit would give me two 128 GB “kits”, one for each system, -AND- a peace of mind.

 
Of course, unless bad luck strikes again and I again end up with bad memory stick in what is brand new kit purchased straight from Corsair.
 
Which makes me wonder: How is me ending up with bad memory in what is brand new kit purchased straight from Corsair even possible? Granted I know nothing about memory manufacturing but I was under impression nowadays kits undergo stringent quality control before they are sent to the market, stick with issue that is easily and quickly reproducible shouldn’t be able to slip undetected through them?

ZoranC 
It’s sad to read such news. Who's guilty? Try different options and keep us updated on how to solve this problem. Good luck =)

jasoncodispoti
I would try this...

 
Hi Jason, first I want to thank you for your constant help, it is very much appreciated :)
 

jasoncodispoti
Install one stick of RAM into the PC and reboot (repeat this process until all of the sticks of RAM are installed) 

 
Could you please educate me how this would help instead of installing them all at the same time?
 

jasoncodispoti
It is possible that you have bad memory... one bad stick is all it takes.

 
I’ve already tried to rule that out before previous post. When first 4 sticks out of 8 in the kit showed immediate instability  I’ve tried second 4 and they too immediately showed instability when using XMP.
 

jasoncodispoti
Dont use any overclocks; disable all overlocks and set everything to default in the BIOS this includes not using XMP

 
I’m not overclocking CPU in any way, it is all left at default (at least I don’t think I am, I will DM you separately on that in order not to derail this thread).
 
When it comes to memory overclocking, I didn’t have problem running MemTest86 for hours on the end using XMP with 2 or 3 sticks from first kit I bought (CL15 3000 MHz). Second kit (CL16 3200 MHz) had immediate stability problems using XMP that seemed to completely go away when running at default 2133 MHz and (this one needs double checking) when using XMP and manually setting memory frequency to 2933 MHz.
 
Which makes me wonder could it be that memory controller on my CPU can’t handle 3200 MHz sticks at full speed?

ZoranC
Which makes me wonder could it be that memory controller on my CPU can’t handle 3200 MHz sticks at full speed?

Very possible.

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.