P100 SXM2 vs L40S
NVIDIA P100 SXM2 (Pascal, 16 GB) against NVIDIA L40S (Ada Lovelace, 48 GB): memory, compute, power and rental price, compared for LLM inference and training.
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Side-by-Side Specifications
| Spec | P100 SXM2 | L40S |
|---|---|---|
| Architecture | Pascal | Ada Lovelace |
| Memory | 16 GB HBM2 | 48 GB GDDR6 |
| Memory bandwidth | 732 GB/s | 864 GB/s |
| FP16 tensor compute | 21.2 TFLOPS | 733 TFLOPS |
| INT8 tensor compute | 21.2 TOPS | 1,466 TOPS |
| Interconnect | NVLink 1.0 · 160 GB/s | PCIe 4.0 · 64 GB/s |
| TDP | 300 W | 350 W |
| Est. on-demand price | ~$0.60/h | ~$3.50/h |
| FP16 TFLOPS per $/h | 35 | 209 |
Highlighted values indicate the stronger spec. Hourly rates are indicative on-demand estimates.
Verdict
Raw performance: The L40S leads on FP16 tensor compute (34.6x advantage), which translates directly into higher token throughput for inference and shorter training steps.
Memory: With 48 GB per card, the L40S fits larger models on fewer GPUs — fewer cards means less inter-GPU communication and simpler deployments.
Value: At current on-demand rates, the L40S delivers more compute per dollar (209 vs 35 FP16 TFLOPS per $/h). If your model fits in its VRAM budget, it is usually the more economical choice.
GPUs Needed for Popular LLMs
Cards required to serve each model at 8-bit quantization (with 20% overhead for activations and KV cache).
| Model | VRAM (8-bit) | P100 SXM2 | L40S |
|---|---|---|---|
| GPT-5.6 Sol | 2682 GB | 168x | 56x |
| DeepSeek V4 Pro (671B) | 750 GB | 47x | 16x |
| Muse Spark 1.1 | 335 GB | 21x | 7x |
| Claude 5 Sonnet (175B) | 196 GB | 13x | 5x |
| Nova Premier (80B) | 89 GB | 6x | 2x |
| Nova Core (34B) | 38 GB | 3x | 1x |
| Nova Lite (12B) | 13 GB | 1x | 1x |
| Phi 3.5 (3.8B) | 4 GB | 1x | 1x |
Frequently Asked Questions
Which is better for LLM inference: P100 SXM2 or L40S?
The L40S delivers more raw FP16 compute (733 TFLOPS) and the L40S offers the most memory per card (48 GB). For cost-efficiency, the L40S currently gives more FP16 TFLOPS per dollar of on-demand rental (209 vs 35 TFLOPS per $/h).
How much more memory does the L40S have?
The P100 SXM2 has 16 GB of HBM2 versus 48 GB of GDDR6 for the L40S — a ratio of 3.00x in favor of the L40S. More VRAM per card means fewer GPUs to fit a given model.
Is the P100 SXM2 or the L40S cheaper to rent?
Estimated on-demand rates are ~$0.60/h for the P100 SXM2 and ~$3.50/h for the L40S. Raw hourly price is only part of the story: normalize by throughput (TFLOPS per $/h) and by how many cards you need for your model's VRAM.
How do the P100 SXM2 and L40S compare on power?
The P100 SXM2 has a TDP of 300W versus 350W for the L40S. FP16 compute per watt: 0.1 vs 2.1 TFLOPS/W.
Deploy on a GPU cloud
Rent the P100 SXM2 or L40S by the hour instead of buying hardware.
