RAM reserved for hardware

[Game_Hustla]

Welp I think my RAM died because my PC won't boot, when it boots I can't use XMP (ram stuck @2133 and will restart 3 times before resetting speed to 2133) and when I login to windows it says "8.1GB Reserved for hardware".

How am I sure my RAM is dead? the moment I remove the dead stick it boots immediately and with the rated speed of 3600 and no "hardware reserved" BS, also tried different stick and it runs fine and even OC'ed a little bit.

Now what really make this a confusing problem is my friend had the same issue one stick died but the other is working the only similarity between our rigs is we're both using Gigabyte motherboards (mine is X570 AORUS Pro WiFi and his is X470 AORUS Gaming 5 WiFi both are rev 1.0), I do have instability with electricity but my PC is connected to a power regulator (my friend too but his was not using it when it happened to him and his electricity is more "stable" than mine).

My kit is G.Skill F4-3600C18D-16GTZRX and uses SK Hynix chips, the other kit is Team Group ELITE PLUS tpd48g2400hc16bk also uses SK Hynix.