MobileLLM R1.5 950M — Hardware Requirements & GPU Compatibility
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MobileLLM R1.5 950M is a 950M-parameter open language model from Meta. At BF16 it needs about 2.09 GB of VRAM — see which GPUs and Macs can run it below.
Runs great on a 24 GB GPU
Runs from 8 GB (BF16 · 32K)Best on 24 GB (BF16 · ~314 tok/s · 32K)Macs from 8 GB (BF16 · ~34 tok/s)
Other
Reference GPU · RTX 4090 24 GB
Estimates, ±20% · how we estimate
Run MobileLLM R1.5 950M
One recommended way. Every other method, OS and quant is in the step-by-step guide.
Recommended
vllm serve facebook/MobileLLM-R1.5-950M --max-model-len 16384vLLM repo with its own quantisation
Download: Weights on Hugging Face
Other ways
each opens step-by-stepRun in cloud
Fits on RTX 3060 12GB (8 GB headroom) · BF16
- Generation speed
- ~112 tok/s
- generation speed
- Cost per 1M output tokens
- $0.21
- per 1M output tokens
How Much VRAM Does MobileLLM R1.5 950M Need?
Select a quantization level; the listed hardware adheres to it.
| Quantization | VRAM | +32K | On RTX 4090 (reference) | |
|---|---|---|---|---|
| 2.1 GB | 5.1 GB | 16-bit · bfloat — Brain floating point 16 — preferred for training | Fits: 32K context · ~314 tok/s |
Selected BF16
Brain floating point 163.5GBat 16K context
- Weights
- 1.6 GB
- KV cache
- 1.6 GB
- Overhead
- 0.3 GB
Fits RTX 4090 (reference) · 20.5 GB free · ~314 tok/s
≥50 tok/s needs ≥161 GB/s · RTX 5090 ~557, RTX 3090 Ti ~314
Which Hardware Can Run MobileLLM R1.5 950M?
BF16 · 2.1 GBMobileLLM R1.5 950M (BF16) requires 2.1 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 3+ GB is recommended. 52 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti. 163 devices with unified memory can run MobileLLM R1.5 950M, including Mac Studio (M3 Ultra, 256GB), Mac Studio (M3 Ultra, 512GB).
≤ 11 GB
≤ 11 GB tier →fits · 4.5 GB free · up to 32K ctx
16 GPUs · 1 Mac class · 2 device families
RTX 3080~237Simulate output on RTX 3080RTX 2080 Ti~192Simulate output on RTX 2080 TiRTX 3070 Ti~189Simulate output on RTX 3070 TiM3*8 GB~34Simulate output on iMac 24" M3 (8 GB)Orin Nano~32Simulate output on NVIDIA Jetson Orin Nano 8GB (Super)iPhone~23Simulate output on iPhone 1720 GB
fits · 16.5 GB free · up to 32K ctx
1 GPU
RX 7900 XT~230Simulate output on RX 7900 XT32–40 GB
fits · 28.5 GB free · up to 32K ctx
1 GPU · 3 Mac classes · 4 device families
RTX 5090~557Simulate output on RTX 5090M5 Max36 GB~154Simulate output on Mac Studio M5 Max (36 GB)M532 GB~51Simulate output on MacBook Air 13" M5 (32 GB)Orin~64Simulate output on NVIDIA Jetson AGX Orin 32GBSnapdragon X Elite (X1E-80-100)~42Simulate output on Snapdragon X Elite Copilot+ PC
By VRAM tier · typical GPUs and Macs at BF16
Similar models
1| Model | Score | VRAM | tok/s | Why it is similar |
|---|---|---|---|---|
| Gemma 3 1B ITGoogle | — | 2.1 GB | ~993 | same size |
Frequently Asked Questions
How much VRAM does MobileLLM R1.5 950M need?
MobileLLM R1.5 950M requires 2.1 GB of VRAM at BF16.
VRAM = Weights + KV Cache + Overhead
Weights = 950M × 16 bits ÷ 8 = 1.9 GB
KV Cache + Overhead ≈ 0.2 GB (at 2K context + ~0.3 GB framework)
Fit ratings and hardware model lists check this model with room for a 16K-token context, which needs a little more memory.
VRAM usage by quantization
Can I run MobileLLM R1.5 950M on a Mac?
Yes — Mac Mini M2 (8 GB) and 145 other Macs can run MobileLLM R1.5 950M. Apple Silicon uses unified memory, so the model shares RAM with the system. At BF16 you need at least 2.1 GB of usable unified memory (RAM minus macOS overhead).
Can I run MobileLLM R1.5 950M locally?
Yes — MobileLLM R1.5 950M can run locally on consumer hardware. Popular tools include Ollama, LM Studio, and llama.cpp.
How fast is MobileLLM R1.5 950M?
At BF16, MobileLLM R1.5 950M can reach ~2297 tok/s on AMD Instinct MI350X. On NVIDIA GeForce RTX 4090: ~314 tok/s. Speed depends mainly on GPU memory bandwidth. Real-world results typically within ±20%.
tok/s = (bandwidth GB/s ÷ model GB) × efficiency
Example: NVIDIA B200 → 8000 ÷ 2.09 × 0.65 = ~2488 tok/s
Estimated speed at BF16 (2.1 GB)
Real-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
What's the download size of MobileLLM R1.5 950M?
At BF16, the download is about 1.90 GB.
Which GPUs can run MobileLLM R1.5 950M?
52 consumer GPUs can run MobileLLM R1.5 950M at BF16. Top options include AMD Radeon RX 6700 XT, AMD Radeon RX 6800, AMD Radeon RX 6800 XT. 52 GPUs have plenty of headroom for comfortable inference.
Which devices can run MobileLLM R1.5 950M?
163 devices with unified memory can run MobileLLM R1.5 950M at BF16 (2.1 GB), including AMD Ryzen AI 9 HX 370 (Strix Point) Laptop, ASUS Ascent GX10, Beelink GTR9 Pro (Ryzen AI Max+ 395, 128 GB), Framework Desktop (Ryzen AI Max+ 395, 128 GB). Apple Silicon Macs use unified memory shared between CPU and GPU, making them well-suited for local LLM inference.