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RAM Bandwidth Calculator

Calculate the maximum theoretical data transfer rate of your system's memory.

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Max Bandwidth (GB/s)

0.0 GB/s

Max Bandwidth (MB/s)

0 MB/s

How is RAM Bandwidth Calculated?

Your RAM's bandwidth is the maximum amount of data it can read or write per second. Understanding this number helps explain why a Dual Channel memory setup is so much faster for gaming and productivity than a Single Channel setup.

The standard formula to calculate memory bandwidth is:

Bandwidth = Memory Speed (MT/s) × Bus Width (8 Bytes) × Number of Channels

  1. Memory Speed: Look at the advertised speed on your RAM box (e.g., DDR4-3200 or DDR5-6000).
  2. Bus Width: Standard consumer PC memory uses a 64-bit bus per channel, which translates to exactly 8 Bytes.
  3. Channels: If you install one stick of RAM, it runs in Single Channel. If you install two identical sticks in the correct motherboard slots, they run in Dual Channel, effectively doubling your bandwidth!

Frequently Asked Questions (FAQ)

Why do people say MT/s instead of MHz?

DDR stands for Double Data Rate. A DDR4-3200 RAM stick actually runs at a physical clock speed of 1600 MHz, but it transfers data twice per clock cycle (1600 × 2 = 3200). Therefore, the technically correct term is 3200 MT/s (Megatransfers per second), though many manufacturers and software still incorrectly label it as MHz.

How much bandwidth does Dual Channel DDR4-3200 have?

Using our calculator formula: 3200 (MT/s) × 8 (Bytes) × 2 (Dual Channel) = 51,200 Megabytes per second (MB/s), which equals exactly 51.2 GB/s of total theoretical bandwidth.

Is DDR5 actually twice as fast as DDR4?

In terms of raw bandwidth, yes! A standard DDR4-3200 dual-channel kit provides 51.2 GB/s of bandwidth. A modern DDR5-6400 dual-channel kit provides a staggering 102.4 GB/s. This massive increase in bandwidth is incredibly beneficial for modern multi-core CPUs and heavy gaming tasks.