May 24, 2023 · Since the introduction of RAM in DIMM (Dual In-line Memory Module) format, there are many types of memory that have been on the market, but since 2000 it is DDR RAM that has prevailed above the rest. Here we will tell the difference between DDR1, DDR2, DDR3, and DDR4 since its inception in 2000.

DDR SDRAM, also retroactively called DDR1 SDRAM, has been superseded by DDR2 SDRAM, DDR3 SDRAM, DDR4 SDRAM and DDR5 SDRAM. None of its successors are forward or backward compatible with DDR1 SDRAM, meaning DDR2, DDR3, DDR4 and DDR5 memory modules will not work on DDR1-equipped motherboards, and vice versa.

Technically, there is no difference between DDR and DIMM, because DDR RAM is a type of DIMM. The difference between DDR and DIMM is something like the difference between a Ford Focus and a car. For example, if you are purchasing more RAM for your computer, you could buy a DIMM of DDR RAM.

Two types of DIMMs: a 168-pin SDRAM module (top) and a 184-pin DDR SDRAM module (bottom). The SDRAM module has two notches (rectangular cuts or incisions) on the bottom edge, while the DDR1 SDRAM module has one. Also, each module has eight RAM chips, but the lower one has an unoccupied space for the ninth chip; this space is occupied in ECC DIMMs.

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