I see a reputable custom builder using a DDR5 5200 along w/ an MSI board for this CPU.  The one I'm looking at is this one which has decent latency.  Is there a compelling reason to aim for faster RAM?  Most important to me is stability and reliability.   

Kingston FURY Beast 32GB (2 x 16GB) 288-Pin PC RAM DDR5 5200 (PC5 41600) Memory (Desktop Memory) Model KF552C36BBEK2-32

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• DDR5 5200 (PC5 41600) 
• Timing 36-40-40 
• CAS Latency 36 
• Voltage 1.25V

20 minutes ago, Noel said:

I see a reputable custom builder using a DDR5 5200 along w/ an MSI board for this CPU.  The one I'm looking at is this one which has decent latency.  Is there a compelling reason to aim for faster RAM?  Most important to me is stability and reliability. 

A 7800X3D should be able to do DDR5-6000 without issue. I wouldn't go faster than that - you start getting into diminishing returns from a price/reliability standpoint.

Cheers

I recently finished a 7800X3D build and I chose to go with DDR5-6000.  It's been running perfectly under EXPO.  No issues whatsoever.
Full specs in my sig

What latency for your 6000 DDR5?

Here is what I bought:  https://www.amazon.com/gp/product/B0BFCV7JZ8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

12 hours ago, Noel said:

What latency for your 6000 DDR5?

I purchased 6000 CL30 for my 7950X3D system about a year ago. Given RAM is reaasonably cheap at the moment, I'd get the fastest and tightest timings you can. Never had an issue with this on my ASUS ROG X670E

7 hours ago, KL Oo said:

I purchased 6000 CL30 for my 7950X3D system about a year ago. Given RAM is reaasonably cheap at the moment, I'd get the fastest and tightest timings you can. Never had an issue with this on my ASUS ROG X670E

Which is the better choice:   5200@CL26, or 6000@CL30?

2 hours ago, Noel said:

Which is the better choice:   5200@CL26, or 6000@CL30?

Probably a push...they have the same Absolute Latency: 10ns

This will help you pick the memory (speed) best for you: https://www.xbitlabs.com/ram-speed-calculator/

All else being equal (i.e., having same Absolute Latency), is there any reason to go w/ 6000 over 5200?  Is one likely to be more stable as it were, or no difference there either?

When dealing with AM5, your first question is "is it on the motherboard's QVL?" If not, find something that is. If the latency is the same, IMO DDR5-6000 is better than DDR5-5200, you can clock InfinityFabric faster.

Cheers

Thanks Luke I forgot about QVL it's been a while!

Cheers

I run DDR5-6000 with CL30 (2 x 16), with an Asus ROG X670-E Wifi board, it's been a reliable setup, right at 1 year since I set it up.   Sticks being on the QVL is a must in my opinion, for flight sim rig.

Spent the whole day building the new machine and installing MSFS and a few addons, and the BIOS the MSI Pro board came with is only a few month's old, but does not seem to want to do anything more than 4800mHz with the GSkill DDR5-6000 16x2 installed and these were on the  QVL, at least the same memory model with 32GB DIMMS was and after I saw it I didn't look to see if the 16GB were also but assumed they probably are.  I've not done any overclocking, just stock settings now.  I first tried the canned XMP profile and that didn't fly just never would POST.  I haven't continued testing beyond 5600 then 5200 but each boot with those never proceeded despite waiting many minutes, up to 10 or so.   Did the full Windows 11 Mem Diagnostic and both DIMMS check out fine.  I'm hoping the diff between 4800 and 6000 in terms of RW performance in MSFS will hardly register, but still would mind getting above 4800.  I will try flashing the BIOS a little later today.

 

I'd make sure the BIOS is up to date.

Thanks Luke I did flash the BIOS and got to 5400mHz but boot was a good 60 seconds from power on to being able to hit Delete to bring up the BIOS, repeatedly.  I searched on ultra slow boot times and found this cryptic pearl here, and right now I am doing the Windows Mem Diagnostic at 6000mHz and it's made it to 70% so far w/ no errors.  The three things bolded below are what made the diff.  I tried the XMP profile when first starting working with this and it never did post.

So I had this exact issue with a MSI B650M-P Pro board. Using G.Skill Trident Z5 32GB (2x16) 6000 kit. (F5-6000J3636F16GA2-TZ5RK). By default, the boot time/reboot time was close to 80-90 seconds thanks to the memory training everytime I rebooted or powered down the system. It was pretty bad regardless of if I had A-XMP on or not.

I was able to find the fix after a couple hours of research though. In the BIOS, turn on advanced mode and go to the OC section and find the "Memory Context Restore" option and set it to "Enabled". Also, go into the Advanced DRAM configuration and then into the Misc section and set the "Power Down Enable" setting to "Enabled". I also re-enabled A-XMP and then rebooted. The first time it trained as usual and took a while to come up. After the next power down and back up though it is now booting in a much more reasonable 20 seconds. The time from power on to seeing the MSI logo is now only about 5 seconds, which is a totally normal amount of time.