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HBM
WebGPUEnterprise

Memory verified.

Measured 27 September 2026 at 17:55 UTC on Chrome 154, macOS by OP-FF606A.

MEM Score69.6
Percentile
Calibrating
1 of 5 class runs needed. Top 55 % overall
Device class
Apple M3 Max
LPDDR5, 512-bit, 400 GB/s peak (varies)
Read275.5GB/s
Write220.0GB/s
Copy240.1GB/s
Random access52.5 GB/s3.28 G reads/s
Latency proxy394 ns
Sustain240.9 GB/s100 % held over 18 s
AI decode ceiling

69tokens/s, 8B model at 4-bit

7.9 tokens/s at 70B, if it fits. Upper bound

READWRITECOPYSUSTAINMEMPRINT / 676455
Memprint: drawn from this run's measurements only.
  • The tab was hidden for part of the run.
Timing
GPU timestamps
Working set
2 × 256 MiB
Data moved
5.00 TB
Duration
48.5 s
Stack position
Layer 000, die 60 of 64
Run
1dsjypah3v
Test your memoryFind it in The StackApple M3 Max