@cesarpose @mrmasterkeyboard depends on the model and #hp has something more sinister:

• In many #ProBook|s they literally do a "soft" #VendorLock re #RAM, so if the stick's ain't hp-branded (as per SPD-EEPROM) the #UEFI will brick #UnattendedBoot, #UnattendedReboot & #PXEboot by popping up an error message every boot that needs to be dismissed by hitting F1 on the internal keyboard (!!!) and can't be dismissed permanently.

I literally had this with a client in the past and it's the reason a #refurbisher I know didn't offer RAM-#Upgrades for HP machines at all…