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We expose the actual memory controller clock rate in Linux, not the effective memory clock of the DRAMs. To translate it, it follows the following formula: Clock conversion (Mhz): HBM: effective_memory_clock = memory_controller_clock * 1 G5: effective_memory_clock = memory_controller_clock * 1 G6: effective_memory_clock = memory_controller_clock * 2 DRAM data rate (MT/s): HBM: effective_memory_clock * 2 = data_rate G5: effective_memory_clock * 4 = data_rate G6: effective_memory_clock * 8 = data_rate Bandwidth (MB/s): data_rate * vram_bit_width / 8 = memory_bandwidth Some examples: G5 on RX460: memory_controller_clock = 1750 Mhz effective_memory_clock = 1750 Mhz * 1 = 1750 Mhz data rate = 1750 * 4 = 7000 MT/s memory_bandwidth = 7000 * 128 bits / 8 = 112000 MB/s G6 on RX5600: memory_controller_clock = 900 Mhz effective_memory_clock = 900 Mhz * 2 = 1800 Mhz data rate = 1800 * 8 = 14400 MT/s memory_bandwidth = 14400 * 192 bits / 8 = 345600 MB/s Acked-by: Evan Quan <evan.quan@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> |
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