Can Yi 1.5 34B run on Mac Studio M1 Ultra 128GB?

YES — Runs Great

B59Good

○Estimated from fit model

Yi 1.5 34B needs ~39.1 GB VRAM. Mac Studio M1 Ultra 128GB has 92.2 GB. With Q4_K_M quantization, expect ~23 tok/s.

Runtime: llama.cppCapacity: RoomyBandwidth: HighStack: StandardBottleneck: Balanced

Operating mode

Choose the run profile you care about

Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.

Current mode

Balanced

Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.

Capabilities:

Select quantization to explore

Q4_K_M (Medium quality) — 39.1 GB, 23.0 tok/s, Runs well

39.1 GB required92.2 GB available

42% VRAM used

Fit status

Runs well

Decode

23.0 tok/s

TTFT

8405 ms

Safe context

Memory

39.1 GB / 92.2 GB

Memory breakdown

Weights20.7 GB

KV Cache3.7 GB

Runtime0.9 GB

Headroom13.8 GB

See how fast it feels

See how fast it feelsYi 1.5 34B on Mac Studio M1 Ultra 128GB
1st promptCold start — includes initialization
>Solve: If a train travels at 60 mph for 2.5 hours, how far does it go?
Let me work through this step by step.

Given information:
 - Speed = 60 mph (miles per hour)
 - Time = 2.5 hours

Formula: Distance = Speed x Time

Calculation:
 Distance = 60 mph x 2.5 h
 = 150 miles

The train travels 150 miles.

Double-check: at 60 mph the train covers 60 miles each hour. In half an hour it covers 30 miles. So in 2.5 hours: 60 + 60 + 30 = 150 miles. Confirmed.
2nd promptWarm — model ready, no init overhead
>What if the train stops for 20 minutes halfway?
The stop doesn't change the total distance covered while moving, but it affects total trip time.

Breakdown:
 - First half: 1.25 hours at 60 mph = 75 miles
 - Stop: 20 minutes (no distance)
 - Second half: 1.25 hours at 60 mph = 75 miles

Total distance: 150 miles (same)
Total time: 2.5 h + 0.33 h = 2.83 hours
Average speed: 150 / 2.83 = 53 mph

The distance stays the same but average speed drops to 53 mph because of the stop.
Estimated: 23.0 tok/s decode · 8.4s TTFT (warm) · 58 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

Shared-memory contention still exists

The OS, browser, and inference runtime all compete for the same physical memory pool, so real-world headroom is less forgiving than raw capacity suggests.

Best improvement path

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	B	Runs well	23.0 tok/s	4585 ms	4K
Coding	B	Runs well	23.0 tok/s	8405 ms	4K
Agentic Coding	B	Runs well	23.0 tok/s	12226 ms	4K
Reasoning	B	Runs well	23.0 tok/s	9933 ms	4K
RAG	B	Runs well	23.0 tok/s	15282 ms	4K

Quantization options

How Yi 1.5 34B (34B params) fits at each quantization level on Mac Studio M1 Ultra 128GB (92.2 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	13.3 GB	Low	C53
Q3_K_S	3	16.7 GB	Low	C53
NVFP4	4	19.0 GB	Medium	C53
Q4_K_M	4	20.7 GB	Medium	C54
Q5_K_M	5	24.5 GB	High	C54
Q6_K	6	27.9 GB	High	C55
Q8_0	8	36.4 GB	Very High	B57
F16Best for your GPU	16	69.7 GB	Maximum	B60

Get started

Copy-paste commands to run Yi 1.5 34B on your machine.

Run

lms load Yi-1.5-34B-Chat && lms server start

Upgrade options

Hardware that runs Yi 1.5 34B well

👁 NVIDIA
RTX PRO 6000 Blackwell Workstation Edition 96GBBudget pick

1792 GB/s (+992)

Raises estimated decode speed by about 243%.78.8 tok/s decode

Raises estimated decode speed by about 243%.

~$9,999 MSRP

👁 NVIDIA
RTX PRO 6000 Blackwell Server Edition 96GBBest value

1597 GB/s (+797)

Raises estimated decode speed by about 205%.70.2 tok/s decode

Raises estimated decode speed by about 205%.