Home / Can I run it? / Qwen3-235B / Qwen3-235B on a Mac Studio 256GB

Yes. Qwen3-235B at Q4_K_M needs about 164.9 GB, and the Mac Studio M5 Ultra 256GB has 192.0 GB usable at a ~4k context.

Can I run Qwen3-235B on a Mac Studio 256GB?

Qwen3-235B at Q4_K_M needs about 164.9 GB, and the Mac Studio M5 Ultra 256GB has 192.0 GB usable. That figure is 256 GB of unified memory on the spec sheet, of which 192.0 GB is usable for weights and cache, at 1200 GB/s memory bandwidth. Qwen3’s large Mixture-of-Experts (235B total, about 22B active). It needs a high-memory unified machine at Q4, not a single consumer GPU. These are estimates from our formula, not measured benchmarks.

Quant that fits

Q4_K_M Fits with headroom

Memory needed

164.9 GB at Q4_K_M, ~4k context

Usable unified memory

192.0 GB of 256 GB unified memory

Est. tokens/sec

up to 72 estimate

Qwen3-235B-A22B · Mac Studio M5 Ultra 256GB · Everything this machine runs · Q4 vs Q8 vs FP16

Memory at each quant

Estimated tokens per second

Estimate: up to 72 tokens/sec at Q4_K_M (upper bound: this is a Mixture-of-Experts, and only the active weights are counted). This is a bandwidth-derived range, not a bench. Efficiency is a 45–80% unified-memory band from How we calculate.

Context headroom

At Q4_K_M, this machine has headroom out to about 128k tokens under our KV estimate. Longer chats need more memory for the cache. Figures assume an FP16 KV cache.

From the model’s config. Try other sizes in the VRAM calculator or see the context length guide.

What to do instead

• Q8_0 needs 288.3 GB and does not fit here. The Mac Studio M5 Ultra 512GB has 384.0 GB usable, enough for Q8.
• See the best GPU for this model family and the Qwen3-235B-A22B model page.

Other hardware for Qwen3-235B

• Qwen3-235B on a Mac Studio 512GBFits
• Qwen3-235B on dual RTX 3090sWon’t fit
• Qwen3-235B on an RTX 5090Won’t fit
• Qwen3-235B on an RTX 4090Won’t fit
• Qwen3-235B on a Mac mini 64GBWon’t fit

Other models on a Mac Studio 256GB

• Llama 3.3 70B on a Mac Studio 256GBFits
• R1 Distill 70B on a Mac Studio 256GBFits
• gpt-oss-120b on a Mac Studio 256GBFits
• DeepSeek-R1 on a Mac Studio 256GBWon’t fit
• DeepSeek-V3.2 on a Mac Studio 256GBWon’t fit
• Mixtral 8x22B on a Mac Studio 256GBTight