RTX PRO 6000 Blackwell vs L40S
NVIDIA RTX PRO 6000 Blackwell (Blackwell, 96 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 | RTX PRO 6000 Blackwell | L40S |
|---|---|---|
| Architecture | Blackwell | Ada Lovelace |
| Memory | 96 GB GDDR7 | 48 GB GDDR6 |
| Memory bandwidth | 1,792 GB/s | 864 GB/s |
| FP16 tensor compute | 1,000 TFLOPS | 733 TFLOPS |
| INT8 tensor compute | 2,000 TOPS | 1,466 TOPS |
| Interconnect | PCIe 5.0 · 128 GB/s | PCIe 4.0 · 64 GB/s |
| TDP | 600 W | 350 W |
| Est. on-demand price | ~$5.00/h | ~$3.50/h |
| FP16 TFLOPS per $/h | 200 | 209 |
Highlighted values indicate the stronger spec. Hourly rates are indicative on-demand estimates.
Verdict
Raw performance: The RTX PRO 6000 Blackwell leads on FP16 tensor compute (1.4x advantage), which translates directly into higher token throughput for inference and shorter training steps.
Memory: With 96 GB per card, the RTX PRO 6000 Blackwell 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 200 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) | RTX PRO 6000 Blackwell | L40S |
|---|---|---|---|
| GPT-5.6 Sol | 2682 GB | 28x | 56x |
| DeepSeek V4 Pro (671B) | 750 GB | 8x | 16x |
| Muse Spark 1.1 | 335 GB | 4x | 7x |
| Claude 5 Sonnet (175B) | 196 GB | 3x | 5x |
| Nova Premier (80B) | 89 GB | 1x | 2x |
| Nova Core (34B) | 38 GB | 1x | 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: RTX PRO 6000 Blackwell or L40S?
The RTX PRO 6000 Blackwell delivers more raw FP16 compute (1,000 TFLOPS) and the RTX PRO 6000 Blackwell offers the most memory per card (96 GB). For cost-efficiency, the L40S currently gives more FP16 TFLOPS per dollar of on-demand rental (209 vs 200 TFLOPS per $/h).
How much more memory does the RTX PRO 6000 Blackwell have?
The RTX PRO 6000 Blackwell has 96 GB of GDDR7 versus 48 GB of GDDR6 for the L40S — a ratio of 2.00x in favor of the RTX PRO 6000 Blackwell. More VRAM per card means fewer GPUs to fit a given model.
Is the RTX PRO 6000 Blackwell or the L40S cheaper to rent?
Estimated on-demand rates are ~$5.00/h for the RTX PRO 6000 Blackwell 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 RTX PRO 6000 Blackwell and L40S compare on power?
The RTX PRO 6000 Blackwell has a TDP of 600W versus 350W for the L40S. FP16 compute per watt: 1.7 vs 2.1 TFLOPS/W.
Deploy on a GPU cloud
Rent the RTX PRO 6000 Blackwell or L40S by the hour instead of buying hardware.
