Are DDR4 and DDR5 modules interchangeable?

No. Each DDR generation uses a different notch position and electrical design, so a DDR5 DIMM will not physically fit a DDR4 slot and vice versa. Motherboards support exactly one generation. You must match the RAM generation to what the CPU and motherboard accept — there is no backward or forward compatibility between generations.

Why does DDR5 run at lower voltage than DDR4?

Each generation lowers the standard supply voltage to cut power and heat as speeds rise — DDR3 at 1.5V, DDR4 at 1.2V and DDR5 at 1.1V. DDR5 also moves power-management circuitry (the PMIC) onto the module itself for finer voltage regulation, which improves stability at the much higher data rates DDR5 reaches.

What does the data rate like DDR5-6000 mean?

The number is the effective transfer rate in mega-transfers per second (MT/s). DDR (Double Data Rate) memory transfers data on both edges of the clock, so DDR5-6000 runs an effective 6000 MT/s from a 3000 MHz clock. Higher numbers mean more bandwidth, subject to what the CPU memory controller can run stably.

Is SODIMM the same as DIMM?

They share the same DDR generation and timings but differ physically. DIMMs are the full-size modules used in desktops and servers; SODIMMs are the shorter modules used in laptops and small-form-factor PCs. A given generation has different pin counts for DIMM and SODIMM, and the two are not interchangeable in the same slot.

Does this reference store my searches?

No. The table and filter run entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored.

RAM Type & Speed Reference

Email me this result

Get this tool's output sent to your inbox, plus one useful tool a week. No spam, unsubscribe any time.

DDR SDRAM generations compared

DDR (Double Data Rate) SDRAM has advanced through five mainstream desktop generations, each roughly doubling peak bandwidth while lowering voltage. Because the generations use different keying and signalling, modules are never interchangeable across generations. This reference compares DDR through DDR5 by data-rate range, supply voltage and DIMM pin count so you can identify and match the right memory.

How it works

The “DDR” in the name means the memory transfers data on both the rising and falling edge of the clock, so the advertised number — DDR4-3200, DDR5-6000 — is the effective mega-transfers per second, double the clock frequency. Each generation increases burst length and bus efficiency, raises the data-rate ceiling, and drops the supply voltage (2.5V → 1.8V → 1.5V → 1.2V → 1.1V) to manage power. Physical keying moves the notch each generation so a module only fits the slot it belongs in, and pin counts differ between desktop DIMMs and laptop SODIMMs. Match the generation to your CPU memory controller and board.

Tips and notes

Generations are mutually exclusive — a board supports exactly one.
The speed number is MT/s (effective), not the raw clock in MHz.
DDR5 adds an on-module PMIC and splits each DIMM into two sub-channels.
Desktop DIMM and laptop SODIMM of the same generation are not swappable.