What is the difference between DIMM modules labelled as PC3L 12800S and PC3L 12800U, respectively? I guess they are both low-voltage PC3 modules but AFAIK PC3L modules run at 1.35V (instead of 1.5V) while PC3U modules run at 1.25V.

Are these both PC3L modules or is the latter a PC3U module?

The 12800S module was a SODIMM module (laptop) while the 12800U module was a DIMM module (desktop) is the letter following 12800 referring to this? None of my other DIMM modules (DIMM or SODIMM) of earlier generation have suffixes after the number.

Any help is greatly appreciated.

Best, J

1 Answer

Wikipedia link for info about RAM

quoted from tomshardware.com

Buffered and registered are the same thing

• E stands for ECC (error correcting)

• R stands for Registered .

• U is not ECC and not registered

to use ECC you will need a Chipset (motherboard) and CPU that supports it .

for most home use you dont need ECC memory , unless you are using it for scientific calculations/programs that needs ECC ...

source of info

this is what ECC is