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All estimates are approximations based on mathematical models and public specifications. Actual performance may vary. Do not make purchasing decisions based solely on these estimates.

Data sourced from Hugging Face, Ollama, and official model documentation. Model names and logos are trademarks of their respective owners.

© 2026 Will It Run AI — Fase Consulting Ibiza, S.L. (NIF: B57969656)

Home/Devstral 2 123B Instruct/on Mac Studio M3 Ultra 256GB

Can it run?

Can Mac Studio M3 Ultra 256GB run Devstral 2 123B Instruct?

CUsable

Runs well

Using Q4_K_M in vLLM

Capabilities:

Fit status

Runs well

Decode

7.4 tok/s

TTFT

26082 ms

Safe context

24K

Memory

124.3 GB / 184.3 GB

Memory breakdown

Weights75.0 GB
KV Cache19.2 GB
Runtime2.4 GB
Headroom27.6 GB

Performance by workload

WorkloadGradeFitDecodeTTFTContext
Agentic CodingCRuns well7.4 tok/s37938 ms41K
ChatCRuns well7.4 tok/s14227 ms13K
CodingCRuns well7.4 tok/s26082 ms24K
RAGCRuns well7.4 tok/s47423 ms41K
ReasoningCRuns well7.4 tok/s30825 ms24K

Quantization options

How Devstral 2 123B Instruct (123B params) fits at each quantization level on Mac Studio M3 Ultra 256GB (184.3 GB usable).

QuantBitsVRAMQualityFit
Q2_K
2
48.0 GB
LowD35
Q3_K_S
3
60.3 GB
LowD37
NVFP4
4
68.9 GB
MediumD38
Q4_K_M
4
75.0 GB
MediumD38
Q5_K_M
5
88.6 GB
HighD40
Q6_K
6
100.9 GB
HighC41
Q8_0Best for your GPU
8
131.6 GB
Very HighC45
F16
16
252.2 GB
MaximumF0

Get started

HuggingFace
huggingface-cli download devstral-2-123b

Upgrade options

Hardware that runs Devstral 2 123B Instruct well

AMDAMD Instinct MI350X 288GBBudget pick
C77.8 tok/s decode

~$8,000 MSRP

AMDAMD Instinct MI300X 192GBBest value
C55.1 tok/s decode

~$15,000 MSRP

NVIDIAH100 NVL 188GBBiggest leap
B84.2 tok/s decode

 

See all results for Mac Studio M3 Ultra 256GBSee all hardware for Devstral 2 123B Instruct