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!

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

Intel i9-10900X
 
I like G.Skill RAM

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!

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/
 

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).

ZoranC
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!

 
For clarification... 

In simple terms a "DIMM" is a single memory module; AKA a single stick of RAM. The "channel" is the path that connects each memory module to the CPU and allows the two to communicate. The EVGA X299 Dark specifically supports x1 DIMM per channel and it has a total of x4 channels which means that each channel supports exactly x1 DIMM. This does not change regardless of the BIOS version installed or RAM installed on the EVGA X299 Dark. Too my knowledge all X299 CPU's support x4 memory channels with the ability for each channel to support x2 memory modules. Thus some X299 motherboards allow you to install up to x8 sticks of RAM. The EVGA X299 Dark is specifically engineered this way on purpose as having one DIMM per memory channel allows for better stability when overclocking. The new Intel Cascade Lake-X CPU's such as your i9-10900X support up to 256GB of RAM an increase from the previous max of 128GB. However in order for the CPU to support 256GB of RAM the motherboard would need to support x2 DIMMs per channel which would limit the speed of the RAM to DDR4-2666. As mentioned earlier however the EVGA X299 Dark does NOT support x2 DIMMs per channel and will instead be capable of using DDR4-2933. 
 
Regarding which memory modules are supported I would follow the "supported 32G memory list" that Tin_EE provided, link below. As a side note TiN_EE is an EVGA employee, he is actually one of the main engineers that designed the X299 Dark and a number of other EVGA products with Vince. Otherwise I would suggest submitting an official support ticket with EVGA to get your answer.    
 
Sources: 
Anandtech, https://www.anandtech.com/show/14925/intel-cascade-lakex-for-hedt-18-cores-for-under-1000
TiN_EE, https://forums.evga.com/32GB-memory-support-on-EVGA-motherboards-m3010100.aspx 

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. 

3000 mhz vs 2933 on 10900X
C15 vs C16
4x32 or two 2x32?
 

jasoncodispoti
As mentioned earlier however the EVGA X299 Dark does NOT support x2 DIMMs per channel and will instead be capable of using DDR4-2933. 

 
Thank you for confirming I am interpreting things correctly and that I will be fine 😊
 

jasoncodispoti
Regarding which memory modules are supported I would follow the "supported 32G memory list" that Tin_EE provided, link below. As a side note TiN_EE is an EVGA employee, he is actually one of the main engineers that designed the X299 Dark and a number of other EVGA products with Vince.

TiN_EE, https://forums.evga.com/32GB-memory-support-on-EVGA-motherboards-m3010100.aspx 

 
Thank you! I didn’t know that Tin_EE is EVGA staff but my sentence was not meant to imply he wasn’t, just that I remember a single post (not a thread) by what I believe is someone else on EVGA staff and it wasn’t in that thread. I still can’t find that darn post but it seems Corsair Vengeance LPX is my only option so it doesn’t matter anymore.
 
Speaking of Vengeance LPX their site doesn’t offer 128 GB (4x32) kit in speed higher than 2666 while CPU is 2933. Their 64 GB (2x32) kit does. Also 64 GB kit is not listed as 2933, it is listed as 3000, and they have to options: C15 and C16.
 
Do you see anything that would cause issues when using two 64 GB 3000 MHz C15 kits in my setup?

ZoranC
 
...Speaking of Vengeance LPX their site doesn’t offer 128 GB (4x32) kit in speed higher than 2666 while CPU is 2933. Their 64 GB (2x32) kit does. Also 64 GB kit is not listed as 2933, it is listed as 3000, and they have to options: C15 and C16.
 
Do you see anything that would cause issues when using two 64 GB 3000 MHz C15 kits in my setup?

Yeah, I had noticed that when I was looking at it earlier... I would go with the 3000MHz C15 Kit, by default that kit is going to run at 2133MHz, you will have to enable XMP (overclock) to get the kit to run at the advertised speed of 3000MHz. That being said I cant imagine that the extra 67MHz over the 2933MHz is going to make that big of a difference in stability, but it would be easy enough to test. 

Thank you again! So no reason two separate 64GB kits purchased at the same time would be a bad idea?
 
I too figure 3000 vs 2933 is too small of a difference to end up causing trouble. If “older” CPUs that could support “only” 128 GB at 2666 total handled 3000 then I figure i9-10900X that can handle 256GB at 2993 will likely be fine handling 128 at 3000.