This is my main PC, I built it in 2021 and since then I changed most of it except the case, cooler, motherboard and PSU. For the last months, it started glitching everytime I turned it off, fans ramped up, RGB started flashing, it'd only stop if turned the PSU switch off or pulled the plug.
Last week, while I was getting a freelance job ready to deliver, it suddenly froze and got stuck on BIOS. It only started working back IF I removed 2 of the ram sticks and turned XMP off. Since I didn't change the motherboard since the first build and I live near the coast (but not on the beach), I thought it was the time, maybe the humidity finally got to it. Got a B550 aorus elite v2 to replace it, updated the BIOS, did a full windows clean install, disconnected every HDD and SSD except the system one. The problem still was there, glitching when turning off, not booting with XMP on or with 4 ram slots full. I already tested the rams by pair and they worked but I noticed something strange with one of the ram sticks.
Now, I am running memtest86 at 2am, showing 300 errors while still in pass 2/4, with XMP off and running with a clean updated BIOS. It can be my CPU but I never pushed it too hard during these last 3 years (it's a 5900X but I don't OC it and it never gets hotter than 65°C).
Anyone has an idea if it's really a faulty RAM or if it's anything else? I am already running the PC as bare as it can and even switched plugs, spent money on another motherboard, I need to be sure it is a faulty RAM to activate the Kingston's lifetime warranty.