What does U stand for in RAM?

Question

Iron

What does U stand for in RAM?
For example:
DDR4, 3333 MHz (PC4-26600)
DDR4, 3333 MHz (PC4-26600U)
How do they differ and which one is better for a computer designed for overclocking?

Answer 1

perhaps U is the original way of specifying the type of memory - not buffered, for conventional computers.
google Form Factor: UDIMM
unlike buffered - more load on the processor memory controller, therefore, if you install such memory in the server, then the maximum amount of memory for the server processor cannot be achieved.
https://ru.wikipedia.org/wiki/%D0%A0%D0%B5%D0%B3%D...
and more, never do this

DDR4, 3333 MHz (PC4-26600U)

- write the full memory model, then on the manufacturer's website you can find out the type and characteristics

Answer 2

You didn't make a mistake in writing?
https://yandex.ru/search/?text=PC4-26600U