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What is the maximum bandwidth for DDR5 modules?

What is the maximum bandwidth for DDR5 modules?

T
TheEaglesun1
Junior Member
4
06-26-2021, 01:19 PM
#1
DDR 5 seems to have two 32-bit channels. I believed it was just one. I'm guessing this means that 6000mhz RAM would achieve 6000x32x2^8 = 48GBps? Is this speed per module or per pair of modules? If I have two 48GB modules at 6000mhz, does that give me 48 or 96GBps?
T
TheEaglesun1
06-26-2021, 01:19 PM #1

DDR 5 seems to have two 32-bit channels. I believed it was just one. I'm guessing this means that 6000mhz RAM would achieve 6000x32x2^8 = 48GBps? Is this speed per module or per pair of modules? If I have two 48GB modules at 6000mhz, does that give me 48 or 96GBps?

T
TenHigh
Junior Member
3
06-26-2021, 06:21 PM
#2
RAM bandwidth calculator details:
https://edu.finlaydag33k.nl/calculating ram bandwidth/
The information is somewhat intricate to address directly. For DDR4 configurations, with a single 64-bit channel per DIMM and a 3000 MT/s DIMM, the maximum achievable bandwidth reaches 24 GB/s. Inserting a second DIMM into the correct slot transforms it into dual-channel RAM, doubling the speed to 48 GB/s. In DDR5 systems, each DIMM features two 32-bit channels, allowing individual DIMMs to operate in dual-channel mode simultaneously. This configuration elevates bandwidth to 96 GB/s. The actual outcome hinges on the precise placement of the DIMMs within the slots. Placing both DIMMs on Channel A limits performance to 48 GB/s, whereas aligning each DIMM into its designated channel (as recommended by the MoBo manual) enables a combined bandwidth of up to 96 GB/s. Dual-rank (2R) RAM refers to modules containing two distinct memory chip sets within a single DIMM, offering potential gains in density and speed or reduced latency compared to single-rank (1R) units. However, overall results remain contingent on the controller's capability and workload specifics. It is not possible to discern dual-rank RAM by examining DIMM modules individually, as memory chips reside on both sides of the DIMM but the RAM remains 1R.

Source references provided maintain consistency in structure and detail.
T
TenHigh
06-26-2021, 06:21 PM #2

RAM bandwidth calculator details:
https://edu.finlaydag33k.nl/calculating ram bandwidth/
The information is somewhat intricate to address directly. For DDR4 configurations, with a single 64-bit channel per DIMM and a 3000 MT/s DIMM, the maximum achievable bandwidth reaches 24 GB/s. Inserting a second DIMM into the correct slot transforms it into dual-channel RAM, doubling the speed to 48 GB/s. In DDR5 systems, each DIMM features two 32-bit channels, allowing individual DIMMs to operate in dual-channel mode simultaneously. This configuration elevates bandwidth to 96 GB/s. The actual outcome hinges on the precise placement of the DIMMs within the slots. Placing both DIMMs on Channel A limits performance to 48 GB/s, whereas aligning each DIMM into its designated channel (as recommended by the MoBo manual) enables a combined bandwidth of up to 96 GB/s. Dual-rank (2R) RAM refers to modules containing two distinct memory chip sets within a single DIMM, offering potential gains in density and speed or reduced latency compared to single-rank (1R) units. However, overall results remain contingent on the controller's capability and workload specifics. It is not possible to discern dual-rank RAM by examining DIMM modules individually, as memory chips reside on both sides of the DIMM but the RAM remains 1R.

Source references provided maintain consistency in structure and detail.