1344 GB/s (+544)
B
Raises estimated decode speed by about 143%.59.1 tok/s decode
Raises estimated decode speed by about 143%.
~$4,999 MSRP
Can Yi 1.5 34B run on Mac Studio M2 Ultra 64GB?
YES — Runs Great
B65Good
○Estimated from fit model
Yi 1.5 34B needs ~32.2 GB VRAM. Mac Studio M2 Ultra 64GB has 46.1 GB. With Q4_K_M quantization, expect ~24 tok/s.
Runtime: llama.cppCapacity: RoomyBandwidth: HighStack: StandardBottleneck: Balanced
Share:
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.
Select quantization to explore
Q4_K_M (Medium quality) — 32.2 GB, 24.3 tok/s, Runs well
32.2 GB required46.1 GB available
70% VRAM used
Fit status
Runs well
Decode
24.3 tok/s
TTFT
7970 ms
Safe context
4K
Memory
32.2 GB / 46.1 GB
Memory breakdown
Weights20.7 GB
KV Cache3.7 GB
Runtime0.9 GB
Headroom6.9 GB
See how fast it feels
See how fast it feelsYi 1.5 34B on Mac Studio M2 Ultra 64GB
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: 24.3 tok/s decode · 8.0s TTFT (warm) · 61 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 | 24.3 tok/s | 4347 ms | 4K |
| Coding | B | Runs well | 24.3 tok/s | 7970 ms | 4K |
| Agentic Coding | B | Runs well | 22.4 tok/s | 12587 ms | 4K |
| Reasoning | B | Runs well | 24.3 tok/s | 9420 ms | 4K |
| RAG | B | Runs well | 24.3 tok/s | 14492 ms | 4K |
Quantization options
How Yi 1.5 34B (34B params) fits at each quantization level on Mac Studio M2 Ultra 64GB (46.1 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 13.3 GB | Low | B57 |
Q3_K_S | 3 | 16.7 GB | Low | B58 |
NVFP4 | 4 |
Get started
Copy-paste commands to run Yi 1.5 34B on your machine.
Run
lms load Yi-1.5-34B-Chat && lms server startUpgrade options