❌Won't fitfp16 · 4K ctx · batch 1
Does L40S run Qwen2.5-72B? No at fp16.
At fp16 precision, Qwen2.5-72B (72 B parameters) needs roughly 164.1 GB of VRAM. L40S only has 48 GB, short by 116.1 GB. INT4 quantization brings it down to 44.6 GB — that fits.
342%
VRAM
Won't fit
Estimated VRAM (fp16)
164.1 GB
of 48 GB on L40S· 116.1 GB short
Tok/sec
37
TFTT
1790ms
Power
223W
Rent on GPUniq marketplace
L40S
Live prices from verified providers · billed hourly, no commitment.
Memory breakdown (fp16)
Model Weights
144.00 GBKV Cache
3.75 GBActivations
15.00 GBFramework Overhead
1.36 GBQuantization comparison
Lower precision = less VRAM with a small quality trade-off. Quality order: FP16 > INT8 > INT4.
| Precision | VRAM | Utilisation | Fits on L40S? |
|---|---|---|---|
| FP16 (full precision) | 164.1 GB | 342% | ❌Won't fit |
| INT8 (8-bit) | 84.4 GB | 176% | ❌Won't fit |
| INT4 / Q4 (4-bit) | 44.6 GB | 93% | ⚠️Tight fit |
Frequently asked
- Can L40S run Qwen2.5-72B?
- Not at fp16 — Qwen2.5-72B needs about 164.1 GB while L40S has 48 GB. It fits at INT4 quantization (44.6 GB) with some accuracy trade-off.
- How much VRAM does Qwen2.5-72B use?
- About 164.1 GB at fp16, 44.6 GB at INT4 (for a 4K context, batch size 1). Longer contexts add to KV cache size; larger batches increase activations.
- What's the fastest way to run Qwen2.5-72B on L40S?
- Use a production inference engine like vLLM, SGLang, or TensorRT-LLM with paged attention — they cut KV cache 2–3× vs the naive estimate and batch multiple requests efficiently. For L40S, enable Flash Attention 2.
- Where can I rent a L40S?
- GPUniq aggregates live L40S offers from verified providers. You can deploy an instance in about a minute and pay hourly with no commitment.
Other GPUs for Qwen2.5-72B
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