PCIe SLI NVLink
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PCIe versions:
- PCIe 3.0: 8 GT/s per lane
- PCIe 4.0: 16 GT/s per lane
- PCIe 5.0: 32 GT/s per lane
- PCIe 6.0: 64 GT/s per lane
SLI (Scalable Link Interface):
- Older technology for linking multiple GPUs
- Limited to 2-4 GPUs
- Lower bandwidth compared to NVLink
NVLink:
- High-bandwidth interconnect for GPU-to-GPU communication
- Much faster than PCIe and SLI
- Supports up to 8 GPUs (depends on GPU model)
Impact on LLM training vs. inference:
Training:
- Requires high bandwidth for data transfer between GPUs
- NVLink is preferable for multi-GPU setups
- Higher PCIe versions beneficial for CPU-GPU data transfer
Inference:
- Generally less demanding on inter-GPU communication
- PCIe is often sufficient, especially for single-GPU setups
- NVLink can still improve performance in multi-GPU inference scenarios