HP t620 does not support standard memory. There is already low-voltage memory, and it will only be low-voltage if you buy it again.

Hardware addition has compatibility effect, because there is no definite method for hardware compatibility at present. If you add it yourself, I suggest you go to the memory dealer to add it on site to see if it can be turned on and run stably (HP machines have no restrictions on memory brands); Or negotiate with the dealer before purchasing if the memory is incompatible, so as not to bring you inconvenience.

Model T620 (G6 F 23A), processor AMD 1.65GHz, memory 4GB, hard disk flash memory 8GB, operating system ThinPro.