Manufacturer: SK hynix (from Korea)

Capacity: 4GB

Type/Speed: PC3L-12800U

PC3L indicates it is DDR3L, the low-voltage version of DDR3 memory, typically operating at 1.35V (instead of the standard 1.5V for regular DDR3).

12800 corresponds to a maximum theoretical transfer speed of 12,800 MB/s, meaning the module is clocked at an effective speed of 1600 MHz (often displayed as DDR3L-1600).

Configuration: 1Rx8

1R means it is Single Rank, using memory chips on one side of the PCB.

x8 refers to the width of the data bus on each chip.

Form Factor: U (Unbuffered) indicates it is a UDIMM (Unbuffered DIMM), which is the standard type for desktop use.

Part Number: HMT451U6AFR8A-PB NO AA

Timing: 11-13-A1 (This likely refers to the main timings, often seen as CL−RCD−RP, or 11−11−11 at 1600 MHz, but the label shows 11−13−13 or similar).