Arethusa

In what units are each measured in? Assuming you have time on the x axis and the variable of interest is on the y axis. If its just percentage with no other information, then it's not much to go off of. 

You're mix matching paired ram, but it is possible the laptop is not outputting enough voltage to run all 4 slots at once.
I'd stick to samsung memory and RMA the others, just cause it's an unknown brand of questionable quality.
Can you up the RAM voltage in Bios or is your Bios locked ? What are your voltage readings vs. specs. when 3 slots are full ?
What are the voltage specs. on the different RAM sticks ?
 

Yeah I just live with the fluctuations, really the fluctuation are usually due to different maps. They don't feel that bad as before since now it never stutters below 90. But my GPU is only a 970 so I expect smoother performance if I were to upgrade. 

New here but just wanted to weigh in on the matter of the stock cooler for the 12400F. Depending on what kind of place you live/have your computer in, certain workloads (in my case, RPCS3 PS3 emulator which hammers down any CPU thrown at it), it can get you even over 90 deg C. Personally ended up replacing it with a basic Hyper 212 LED which dropped my load temps by a good 20 deg C. (There's also the rumoured issue of the CPU's heat spreader being bent by the socket's retention mechanic which could be adding upto this, but I'm not too sure about this.)
 

Still using mine!
AMD Ryzen 9 5950X, ASRock X570 Steel Legend, 32gb corsair, bequiet! DR TF2.
Looking to add 120mm intake fan to side panel.

Just ran a sustained Cinebench load for 20 mins. Temps topped at 83c with stock cooler. CPU was pinned at 4Ghz didn't notice any issues. Will do some more testing later, but this is just for now. 
 

Hi, hows it going? Do you see any VRM throttling on H610M-K or any other issue that hinder your 12400F full (stock) performance? Because I am going to pick this combo too.

Run a core heavy load like Cinebench for an extended period of time (like 30 minutes or longer) and see if the frequency drops off after a while or if the system crashes.

I just bought this combo. Total price in CAD plus shipping is $462.03. I will report my own benchmarks later. 

Gaming on a threadripper isn't the intended use case because while you do have alot of multi-tgreaded processing power, the single core performance isn't that great. You'll find much more gaming oriented motherboards if you were to go with an intel 12900k, something with a z690 chipset. 

I just bought this combo. Total price in CAD plus shipping is $462.03. I will report my own benchmarks later. 

I like the photos of the cable management. Looks clean, nice work!

I like the photos of the cable management. Looks clean, nice work!

I like the photos of the cable management. Looks clean, nice work!