Unverified70% confidenceFactTime unknown
PCIe 4.0 x16的理论带宽约为32GB/s
4
Sources
70%
Confidence
Long-term
Relevance
6/1/2026
First Seen
Sources
本地部署大模型怎么判断显存爆了？一文看懂显存监控方法
bilibili步步梅
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Verified分层加载导致推理速度受限，其根本原因是 PCIe 总线带宽（PCIe 4.0 理论带宽约 32GB/s）远低于 GPU 内部显存带宽81% similarUnverifiedPCIe 4.0 x16 bandwidth is approximately 64GB/s, and each transfer requires an explicit cudaMemcpy call, which is a significant bottleneck in latency-sensitive inference scenarios.80% similarUnverified大模型推理速度往往不受限于算力（FLOPS），而受限于内存带宽；PCIe 4.0 x16理论带宽约32GB/s，GPU显存带宽（GDDR6X约1TB/s）相差30倍以上78% similarVerifiedThe 3080 Ti has a memory bandwidth of 912 GB/s, far exceeding the 16–32 GB/s PCIe bus bandwidth between CPU and GPU.77% similarVerifiedConventional PCIe Gen5 provides approximately 128 GB/s of bidirectional bandwidth.75% similar
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