Can I Run Qwen3.8 on Apple M2 Ultra?
Written by Jakub Rusinowski · Last updated September 11, 2026
Yes, comfortably — Qwen3.8-Flash-Next at Q4_K_M needs 109.7 GB at 8K context (108.7 GB weights + 1 GB KV cache/overhead), leaving ~34.3 GB of the Apple M2 Ultra's 144 GB usable memory, at ~87 tok/s (est.), with room for up to 256K context.
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Apple M2 Ultra Specs
| VRAM | 192 GB unified memory |
| Memory Bandwidth | 800 GB/s |
Qwen3.8-Flash-Next on the Apple M2 Ultra: VRAM by quantization
| Quant | VRAM needed | Fits 192 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 361 GB | ✗ No | — | — |
| Q8_0 | 192.3 GB | ✗ No | — | — |
| Q6_K | 148.6 GB | ✗ No | — | — |
| Q5_K_M | 128.6 GB | ✓ Yes | 256K | — |
| Q4_K_M | 109.7 GB | ✓ Yes | 256K | — |
| Q3_K_M | 77.7 GB | ✓ Yes | 256K | — |
| Q2_K | 60.2 GB | ✓ Yes | 256K | — |
Assumes an 8K-token context with an f16 KV cache. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 192 GB of unified memory. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At Q4_K_M on the Apple M2 Ultra: 8K 109.7 GB · 32K 110.3 GB · 128K 112.7 GB. Every window this model publishes still fits 192 GB.
No compatible GPU? Qwen3.8-Flash-Next on 192 GB of system RAM, CPU only: runs, but it is tight.
Qwen3.8 Sizes That Fit the Apple M2 Ultra (at 8K context)
| Qwen3.8-Flash-Next | Q4_K_M · 109.7 GB at 8K context · ~87 tok/s (est.) |
| Qwen3.8 27B | Q4_K_M · 18.3 GB at 8K context · ~24 tok/s (est.) |
Qwen3.8 needs ~110 GB but this GPU has 192 GB. Rent a 2× A100 (160 GB)-class GPU by the hour instead of buying one:
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Is the Apple M2 Ultra enough to run Qwen3.8 locally?
Yes, comfortably — Qwen3.8-Flash-Next at Q4_K_M needs 109.7 GB at 8K context (108.7 GB weights + 1 GB KV cache/overhead), leaving ~34.3 GB of the Apple M2 Ultra's 144 GB usable memory, at ~87 tok/s (est.), with room for up to 256K context.
What's the best Qwen3.8 size for the Apple M2 Ultra?
Qwen3.8-Flash-Next at Q4_K_M quantization needs 109.7 GB at 8K context (108.7 GB weights + 1 GB KV cache/overhead), estimated ~87 tokens/sec, up to 256K context.
Every Qwen3.8 size on the Apple M2 Ultra
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Qwen3.8-Max | 1457.5 GB | Does not fit | — |
| Qwen3.8-Flash-Next | 109.7 GB | Runs | ~87 tok/s |
| Qwen3.8 27B | 18.3 GB | Runs | ~24 tok/s |
Qwen3.8 on Other GPUs
Popular Models on the Apple M2 Ultra
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