streaming multiprocessor
**Streaming Multiprocessor (SM)** is the fundamental compute building block in NVIDIA GPU architecture, containing CUDA cores, tensor cores, and shared resources for parallel execution.
## What Is a Streaming Multiprocessor?
- **Components**: CUDA cores, tensor cores, LD/ST units, SFUs
- **Resources**: Registers, shared memory, L1 cache
- **Scheduling**: Multiple warps execute concurrently
- **Scale**: Consumer GPUs: 20-80 SMs; Data center: 100+ SMs
## Why SM Architecture Matters
Understanding SM organization is essential for GPU programming optimization. Performance depends on efficiently utilizing SM resources.
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**SM Evolution (NVIDIA)**:
| Architecture | SMs (Max) | CUDA Cores/SM |
|--------------|-----------|---------------|
| Pascal | 60 | 64 |
| Volta | 84 | 64 |
| Ampere | 108 | 64 |
| Hopper | 132 | 128 |