I used an HP RPM calculator through college. It could do cool stuff like graphing and solving equations. Very helpful for an engineering student, not so helpful later in life. I used that calculator until about a year ago when it died (got about 35 years from it). I didn’t use the super fancy stuff anymore, but for a scientific calculator it was pretty solid.
So when it broke, I had to find a replacement for a device that I’ve used for my entire life. Needless to say, I was kind of picky. I tried emulators, and newer TIs, and there’s a bunch of knockoff crap like the article points to. Only one made me happy. A silly little iOS app “PCalc” (it has an icon of “42”). It was like $5, runs on my phone, and honestly I probably should have switched decades ago.
I’m not associated with that app or the author or anything, just a recommendation for anyone old and stubborn like me - I know I’m not alone here with calculator attachment issues :)
TLDR - try slowing down “bad” ram
RAM is tricky these days. When you buy “fast” ram - in my case 6200 dominator sticks - what you really are buying is ram that the manufacturer says can be overclocked to 6200 speeds. But this is shady at best. It is entirely possible for that ram to run fine in your rig, and fail miserably in mine - showing itself as errors in memtest. This can be a result of the motherboard or say your cpu - and nothing is broken. Not the chip, not the mobo, not the ram - they just don’t work together at those speeds. Two sticks can work just fine, and then fail when you add two more (for a total of four). I’ve even had sticks that were on the edge, works for a year, and then started giving me trouble.
Most people just RMA those sticks - which I support - if it’s marketed to run at those speeds, then they should run at those speeds everywhere. But if you have “bad” memory laying around that was out of warranty, and given today’s prices - it might be worth pulling them out and trying to run them a little slower. It’s not like you have to take them all the way down to 3200 and turn off the overlock. For example, on many amd rigs, 6000 is the sweet spot. My “bad” stick of 6200 immediately fails a memtest at 6200 (even running that single dimm), but infinitely passes at 6000 (even with 4 sticks plugged in). I can’t even tell the difference between 6200 and 6000.
So ya - try slowing those bad sticks down manually. It might only be a little bit of a performance hit, but at today’s prices, could save you $1000