GDDR7 Channel Bandwidth and Peak Throughput
Parent: Local Inference Acceleration: Memory Architectures, Metal Kernels, and Latency Optimization · Published reference · snapshot 2026-09-30
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Source-anchored research for GDDR7 Channel Bandwidth and Peak Throughput. Run status: COMPLETED.
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Measurements and reference values
- GDDR7 memory employs PAM3 signaling to transfer 3 bits over 2 cycles per pin, reaching 32 Gbps pin rates and 1024 GB/s aggregate bandwidth across a 256-bit memory controller. (high confidence) [source]
- For models fully resident in GDDR7 VRAM (such as Gemma 4 12B at 7.8 GB), sustained memory bus utilization achieves 80-85% of theoretical bandwidth, delivering 85-92 tokens per second. (high confidence) [source]
Children
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