LFM2.5-1.2B · 11 GPUs measured first-party · llama.cpp · Updated October 2026
What GPU Do You Need for LFM2.5-1.2B?
LFM2.5-1.2B on 11 GPUs, measured first-party: NVIDIA RTX PRO 6000 Blackwell Workstation Edition leads at 989.9 tok/s, T4 trails at 222 tok/s, and it peaked at 2GB of VRAM.
Benchmarked weights: unsloth/LFM2.5-1.2B-Instruct-GGUF
NVIDIA RTX PRO 6000 Blackwell Workstation Edition
989.9 tok/s on LFM2.5-1.2B, the ceiling. Measured on our bench. 96GB of VRAM, $8,565 at launch.
- 989.9 tok/s on LFM2.5-1.2B
- 96GB, clears the LFM2.5-1.2B floor
- Rentable by the hour rather than bought
- 600W board rating
- Datacenter or workstation hardware, not a retail purchase
What GPU Do You Need for LFM2.5-1.2B?, tok/s by GPU
Efficiency: tok/s per 100W drawn
Power is the average pulled during the run, sampled at 1Hz. The fastest card is often not the one here, and for anything left running this is the number that shows up on the bill.
Value: tok/s per $1,000 of MSRP
Launch price, not street price, so it ages. A speed leaderboard always crowns the most expensive card; this is the counterweight.
LFM2.5-1.2B. Measured tokens per second by GPU
| GPU | tok/s | Prompt t/s | tok/W | Avg power |
|---|---|---|---|---|
| NVIDIA RTX PRO 6000 Blackwell Workstation Edition | 989.9 | 49973.7 | 7.94 | 124.6 W |
| NVIDIA B300 | 955.1 | 29700.8 | 3.68 | 259.3 W |
| NVIDIA H200 | 946.5 | 36572.4 | 7.24 | 130.7 W |
| NVIDIA H100 80GB HBM3 | 926.6 | 36717.3 | 6.74 | 137.5 W |
| NVIDIA B200 | 916.8 | 39117.3 | 3.41 | 269.1 W |
| NVIDIA L40S | 661.5 | 39317.8 | 6.56 | 100.9 W |
| NVIDIA A100 80GB SXM4 | 577 | 17999.2 | 4.07 | 141.7 W |
| NVIDIA A100 40GB SXM4 | 572.7 | 15548.5 | 6.12 | 93.6 W |
| NVIDIA A10G | 430 | 16402.3 | 5.24 | 82.0 W |
| NVIDIA L4 | 278.5 | 16762.6 | 6.09 | 45.7 W |
| NVIDIA T4 | 221.7 | 5953.6 | 4.71 | 47.1 W |
What the numbers show. Across 11 GPUs measured on our own bench, RTX PRO 6000 Blackwell Workstation Edition is fastest at 990 tok/s. The slowest, T4, manages 222, so the spread is 4.5x from top to bottom. Per dollar of launch price, A10G gives the most (153.6 tok/s per $1,000). The fastest card with 16GB or less is T4 at 222 tok/s.
How it compares. H100 80GB HBM3: LFM2.5-1.2B 926.6 tok/s, SmolLM2-135M 898.5, Qwen2.5-Coder-0.5B 892.8, gemma-3-270m 961.3, Qwen2.5-0.5B 890.0. 1 of 4 beat LFM2.5-1.2B here.
Cost on a rented GPU. 1M generated tokens of LFM2.5-1.2B: $0.17 on a T4 ($0.14/hr, 75 min), $0.30 on a RTX PRO 6000 Blackwell Workstation Edition ($1.08/hr, 17 min, 1.8x the cost).
LFM2.5-1.2B: cost per 1M generated tokens on rented GPUs
| GPU | Cheapest rate | Speed (tok/s) | Cost per 1M generated tokens |
|---|---|---|---|
| NVIDIA T4 | $0.14/hr | 221.7 | $0.17 |
| NVIDIA A100 40GB SXM4 | $0.47/hr | 572.7 | $0.23 |
| NVIDIA RTX PRO 6000 Blackwell Workstation Edition | $1.08/hr | 989.9 | $0.30 |
| NVIDIA L40S | $0.79/hr | 661.5 | $0.33 |
| NVIDIA L4 | $0.44/hr | 278.5 | $0.44 |
| NVIDIA A100 80GB SXM4 | $0.95/hr | 577 | $0.46 |
| NVIDIA H100 80GB HBM3 | $2.14/hr | 926.6 | $0.64 |
| NVIDIA H200 | $3.59/hr | 946.5 | $1.05 |
| NVIDIA B200 | $5.98/hr | 916.8 | $1.81 |
| NVIDIA B300 | $6.94/hr | 955.1 | $2.02 |
Cheapest hourly rate we track on RunPod and Vast.ai, divided by the measured speed. Startup time and storage are extra.
Speed tiers for LFM2.5-1.2B. 30+ tok/s: 11 (RTX PRO 6000 Blackwell Workstation Edition, B300, H200). 30 tok/s is roughly where replies outpace reading.
Reading your prompt. Before LFM2.5-1.2B writes anything it reads the input: 49973.7 tok/s on the RTX PRO 6000 Blackwell Workstation Edition (0.1s for a 4,000-token prompt), 5953.6 on the T4 (0.7s). Long documents and big code files feel this number more than the generation speed.
VRAM for LFM2.5-1.2B. Measured peak 1.4GB, so 8GB is the smallest common card size; smallest card it ran on: T4 (16GB). With long context: Q4_K_M 1GB (tested), Q2_K 1GB, Q3_K_M 2GB, Q5_K_M 2GB, Q6_K 2GB.
Power on LFM2.5-1.2B. Most efficient: RTX PRO 6000 Blackwell Workstation Edition, 125W, 35.0 Wh per 1M generated tokens. Hungriest: B200, 269W, 81.5 Wh.
Our verdict
Fastest on LFM2.5-1.2B: NVIDIA RTX PRO 6000 Blackwell Workstation Edition, 989.9 tok/s. Cheapest to rent per job: NVIDIA T4, $0.17 per 1M generated tokens.
FAQ
- What GPU do I need to run LFM2.5-1.2B?
- About 1GB. Smallest card that ran it: NVIDIA T4 (16GB).
- How much does it cost to run LFM2.5-1.2B in the cloud?
- $0.17 per 1M generated tokens on a NVIDIA T4 at $0.14/hr, cheapest of 10 rentable cards we measured.
- Can I run LFM2.5-1.2B on a 12GB, 16GB or 24GB card?
- It used 1.4GB at the precision we tested. 12GB: yes; 16GB: yes; 24GB: yes.
- Is the H100 80GB HBM3 or the A100 80GB SXM4 faster for LFM2.5-1.2B?
- The H100 80GB HBM3: 926.6 vs 577.0 tok/s, 61% faster on our bench.
How we test
llama.cpp llama-bench at Q4_K_M, 512-token prompt and 128 generated tokens, three runs after a warmup, full GPU offload, with power and VRAM sampled throughout. Token generation is memory-bandwidth-bound, so the ranking tracks bandwidth closely, which makes it a fair guide to cards we haven't run yet.