Greetings folks,
 
 
 
I have been using the linked 16 Gb RAM since I built this machine around 18 months ago. It's not on the QVL but it's been working wonderfully, the XMP profile loaded and ran the entire time.  In preparation for the new flight sim I ordered the same RAM kit, I reset my BIOS to default and added the 2 additional sticks.  The first thing I noticed was that both XMP profiles were unavailable so I booted with the default settings, no problem.   I then went into the BIOS and set the voltage to 1.35 and the speed to 3000 to see if it would OC but it would not boot, it entered some kind of loop. After rebooting with the defaults I went to look at my monitoring (HWmonitor) software to see what speed the RAM was running, the Speed values were missing, they are also missing in the task manager.   If I remove the new kit the XMP profile becomes available. 
 
So I have a couple of questions, are XMP profiles specific to the number of modules and am I expecting too much to have the same RAM speeds with 32 Gb vs 16Gb.  
 
https://www.newegg.com/g-...0?Item=N82E16820232180

Just to be clear, are you talking about an EVGA Z390 (and which one), which is the forum you posted in?..Or the Asus PRIME Z270-A that's in your sig?

Did you raise the VCCSA and VCCIO voltages?..Set them to 1.2v - 1.3v equally..Make sure the BIOS is up-to-date.

Hmmm, dunno..Try HWiNFO or CPU-Z (in the SPD tab, Slots 1/2/3/4) and see if they're detected.

VSA is VCCSA.

Seem to be different revisions, that happens, different enough to cause issues.

If you get a program like HWiNFO (free) and leave it running, it will tell you how much min/max/avg RAM your system is using while gaming and going about doing what you do on your PC..Then you can see how much of the currently installed RAM you're using before making the decision to buy more..Unused RAM is wasted RAM and if you're not using what's currently installed, adding more won't do anything.

Yeah, it's best to buy matching RAM in a kit.

Yeah your old sticks are dual-rank with 16x 4Gb (512MB) samsung modules vs the new ones single rank with 8x 8Gb (1GB) hynix modules.  They're quite different so that's why you weren't able to use XMP with them.

DukeCLR
I use Graphs in MSI AB to track my system with most of my games I rarely get above 10.  In this shot here you can see how when the MSFS launched out of its menu the RAM usage peaked a bit, it's been reported that it will go up to 20 if it's available so for the first time in awhile I got the upgrade bug.  The ram is the red line second graph from the bottom.

You will need more than 16GB to run FS 2020, well without stutters. Also those memory sticks, while the same timings and speed are nowhere near identical. Very confusing by GSkill to market memory like that. One set is single rank the other is dual rank. Yes indeed,  it will use more than 16 GB  if you have that much system memory and the game will run better with it. (I would know, I am actually running it quite nicely at 4K @ 80% scaling). Those arguing you have 'wasted memory'  if you have excess over what Windows  can cache, are silly when the context is 32GB.
 

I'd just return them for a refund for now and see how it rolls with your currently installed 16GB.

It appears that you're close right now at peak usage, but installing more RAM than your PC will need/use is a waste, that's just plain common sense..You could add 32 bazillion GB of RAM and if your PC doesn't use it, it won't matter.

Microsoft Flight Simulator 2020 - Can You Run It