Samsung RAM Module M391B5673FH0

This is a Samsung M391B5673FH0 series DDR3 ECC UDIMM (Unbuffered DIMM) memory module. Based on the provided markings (“2GB 2Rx8 PC3-8500E”), it appears to be a variant rated at PC3-8500 (DDR3-1066 MHz), but note that this part number commonly ships in higher-speed configurations like PC3-10600E (DDR3-1333 MHz) due to backward compatibility. Here’s a breakdown:

Key Specs

* Capacity: 2 GB

* Type: DDR3 SDRAM

* Rank: 2Rx8 (Dual Rank, 8 banks; x8 organization)

* Speed:

* Marked: PC3-8500E (DDR3-1066 MHz, 8-8-8 timings, 1.5V)

* Common variant: PC3-10600E (DDR3-1333 MHz, CL9 timings; backward compatible with 1066 MHz systems)

* ECC: Yes (Error-Correcting Code for server/workstation reliability)

* Buffer: Unbuffered (UDIMM)

* Form Factor: 240-pin DIMM (desktop/server standard)

* Voltage: 1.5V (standard DDR3)

* Organization: 256M x 72 bits

* Part Variants (suffix indicates exact speed/revision):

* M391B5673FH0-CF8: DDR3-1066 MHz

* M391B5673FH0-CH9: DDR3-1333 MHz

* M391B5673FH0-YF8: DDR3L-1066 MHz (low-voltage 1.35V)

* M391B5673FH0-YK0: DDR3L-1600 MHz

Compatibility

* Designed for servers and workstations, especially Dell PowerEdge (e.g., R710, T610) and similar systems supporting ECC DDR3.

* Not for consumer desktops (lacks non-ECC support).

* Can be mixed with matching Samsung modules, but best in matched pairs/sets for optimal performance.

Usage Notes