NVIDIA80 GB VRAM2,000 GB/s$1.2/hr

Qwen 3 4B on A100 80GB SXM4: Does It Fit, How Fast, What It Costs

Qwen 3 4B at FP16 needs 8.0 GB for its weights and 17.7 GB in total at 8K context with 8 concurrent users. That means it fits on a single A100 80GB SXM4. Every figure is computed by tokcalc's open-source capacity model.

Fits?
Yes, 1 GPU
17.7 GB needed / 80 GB available
Decode speed
162.5
tok/s per stream
Aggregate
1950
tok/s @ 8 concurrent
Cost / 1M tokens
$0.1709
1× A100 80GB SXM4
What changes as you add A100 80GB SXM4s
Tensor-parallel degree vs VRAM, throughput, and cost. Cost scales linearly with GPU count; decode throughput scales near-linearly too, so cost per token stays roughly flat.
GPUsTotal VRAMVRAM neededDecode tok/sAggregate tok/sTTFTCost / 1M tokFits?
1× A10080 GB17.7 GB162.51950456.3 ms$0.1709✓
2× A100160 GB17.7 GB276.36630243.7 ms$0.1006✓
4× A100320 GB17.7 GB552.526520136.8 ms$0.0503✓
8× A100640 GB17.7 GB110510608083.4 ms$0.0251✓
Concurrency vs context length
On 1× A100 80GB SXM4 at FP16. KV cache scales linearly with context, so this is the number of users your GPUs can actually serve.
ContextConcurrent usersKV per requestFits?
4K119618.5 MB✓ fits
8K591.21 GB✓ fits
33K144.83 GB✓ fits
66K79.66 GB✓ fits
131K319.33 GB✓ fits
Other GPUs that run Qwen 3 4B
Same workload, same quantization — ranked by value (tokens per dollar-hour).
GPUGPUsAggregate tok/sCost / 1M tok
RTX 3090 24GB1×912.6$0.0761
RTX 5090 32GB1×1747$0.0795
RTX 4090 24GB1×982.8$0.1131
AMD MI300X 192GB1×5168$0.1344
V100 SXM2 32GB1×877.5$0.1583
A100 40GB SXM41×1511$0.1654
Frequently asked questions

Can Qwen 3 4B run on A100 80GB SXM4?

Yes. Qwen 3 4B at FP16 needs 17.7 GB including the KV cache, and A100 80GB SXM4 has 80 GB — so it fits on a single GPU.

How fast is Qwen 3 4B on A100 80GB SXM4?

162.5 tokens/sec per stream and 1950 tok/s aggregate with continuous batching at 8 concurrent users. Time to first token is 456.3 ms, and inter-token latency is 6.2 ms.

What does Qwen 3 4B on A100 80GB SXM4 cost per million tokens?

$0.1709 per 1M output tokens at 1× A100 80GB SXM4 ($1.20/hr). That is the marginal hardware cost — add idle capacity, ops, and egress for the real figure.

How much VRAM does Qwen 3 4B need on A100 80GB SXM4?

8.0 GB for the weights at FP16, plus 9.7 GB of KV cache for 8 concurrent requests at 8K context — 17.7 GB total. Every extra concurrent user at long context costs more, so leave headroom.

Is A100 80GB SXM4 the right choice for Qwen 3 4B?

It works. Compare $0.1709 per 1M tokens against the alternatives below — the cheapest option that fits the same workload is 2× RTX 3080 10GB at $0.0441, and the fastest is 1× Cerebras CS-3 (WSE-3) at 19500 tok/s.

Adjust the workload yourself

Same formulas, your context length, concurrency, and quantisation.

Open in calculator