OLMo 2 13B at FP16 needs 26.0 GB for its weights and 36.7 GB in total at 8K context with 8 concurrent users. That means it fits on a single RTX PRO 6000 Blackwell 96GB. Every figure is computed by tokcalc's open-source capacity model.
| GPUs | Total VRAM | VRAM needed | Decode tok/s | Aggregate tok/s | TTFT | Cost / 1M tok | Fits? |
|---|---|---|---|---|---|---|---|
| 1× RTX | 96 GB | 36.7 GB | 44.80 | 537.6 | 3.46 s | $0.7750 | ✓ |
| 2× RTX | 192 GB | 36.7 GB | 76.16 | 1828 | 1.75 s | $0.4559 | ✓ |
| 4× RTX | 384 GB | 36.7 GB | 152.3 | 7311 | 888.5 ms | $0.2280 | ✓ |
| 8× RTX | 768 GB | 36.7 GB | 304.6 | 29245 | 459.3 ms | $0.1140 | ✓ |
| Context | Concurrent users | KV per request | Fits? |
|---|---|---|---|
| 4K | 104 | 687.2 MB | ✓ fits |
| 8K | 52 | 1.34 GB | ✓ fits |
| 33K | 13 | 5.37 GB | ✓ fits |
| 66K | 6 | 10.74 GB | ✓ fits |
| 131K | 3 | 21.47 GB | ✓ fits |
| GPU | GPUs | Aggregate tok/s | Cost / 1M tok |
|---|---|---|---|
| RTX 5090 32GB | 2× | 1828 | $0.1520 |
| AMD MI300X 192GB | 1× | 1590 | $0.4368 |
| A100 40GB SXM4 | 1× | 465.0 | $0.5376 |
| AMD MI325X 288GB | 1× | 1800 | $0.5401 |
| A100 80GB SXM4 | 1× | 600.0 | $0.5556 |
| Intel Gaudi 3 128GB | 1× | 990.0 | $0.5612 |
Yes. OLMo 2 13B at FP16 needs 36.7 GB including the KV cache, and RTX PRO 6000 Blackwell 96GB has 96 GB — so it fits on a single GPU.
44.80 tokens/sec per stream and 537.6 tok/s aggregate with continuous batching at 8 concurrent users. Time to first token is 3.46 s, and inter-token latency is 22.3 ms.
$0.7750 per 1M output tokens at 1× RTX PRO 6000 Blackwell 96GB ($1.50/hr). That is the marginal hardware cost — add idle capacity, ops, and egress for the real figure.
26.0 GB for the weights at FP16, plus 10.7 GB of KV cache for 8 concurrent requests at 8K context — 36.7 GB total. Every extra concurrent user at long context costs more, so leave headroom.
It works. Compare $0.7750 per 1M tokens against the alternatives below — the cheapest option that fits the same workload is 4× RTX 3080 10GB at $0.0717, and the fastest is 1× Cerebras CS-3 (WSE-3) at 6000 tok/s.
Same formulas, your context length, concurrency, and quantisation.