HARDWARE BENCHMARK & VRAM ENVELOPE โข APPLE SILICON236 GB VRAM โข 890 GB/s
What Models Can Run on Apple Mac Studio M5 Ultra (256GB Unified Memory)?
236 GB VRAM890 GB/s Bandwidth210W TDPMSRP: $5,999Cloud: $1.89/hr on RunPod
Apple Mac Studio M5 Ultra (256GB Unified Memory) provides 236 GB of usable memory with 890 GB/s memory bandwidth at 210W TDP. Massive MoE models (DeepSeek V4.1 Q3/Q4) & 70B FP16 workstation.
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Runs 100% in GPU VRAM (Optimal Headroom)21.93 GB (9%)~33 t/s
Qwen 3.8 27B Instruct on Apple Mac Studio M5 Ultra (256GB Unified Memory)
โ Fits Comfortably in VRAM
โ FITS IN VRAM
Required VRAM
21.93 GB
9% of hardware capacity (236 GB)Est. Decode Speed
~33 tok/s
Dense model @ 890 GB/sAvailable Headroom
+214.07 GB
Safe for OS display & full contextMemory Allocation & Headroom
21.93 GB allocated of 236 GB capacity
9% utilized
Weights: 16.32 GB
KV: (32K): 4.29 GB
Overhead: 1.32 GB
Free Headroom: +214.07 GB
โก Architecture & Throughput Transparency: Single-user decode speed (~33 tok/s) is memory-bandwidth bound at batch size = 1 on Apple Mac Studio M5 Ultra (256GB Unified Memory) (890 GB/s). Prompt prefill / TTFT (~479 tok/s) is compute-bound and utilizes GPU Tensor cores. Actual latency varies with FlashAttention-2 and runtime engine (Ollama/vLLM/llama.cpp).
OLLAMA_FLASH_ATTENTION=1 OLLAMA_KV_CACHE_TYPE=q8_0 ollama run qwen3.8:27bCloud Instance Options for Qwen 3.8 27B Instruct
On-DemandDeploy this model on an on-demand cloud GPU without local hardware constraints or power usage:
RunPod Cloud GPUsBest 1-Click Ollama & vLLM
$0.34/hr (RTX 4070 Ti) โ $2.39/hr (H100)Vast.ai GPU MarketplaceCheapest Dual RTX 3090 / 4090
$0.18/hr (RTX 3060) โ $0.55/hr (RTX 4090)Lambda GPU CloudEnterprise 8x H100 Clusters
$1.99/hr (GH200 / H100)Quantization Precision Matrix
32K ctx โข KV: Q8_0| Quantization | Weights | KV Cache | Total VRAM | Est. Speed | Fit Status |
|---|---|---|---|---|---|
| FP1616 bpw | 54.4 GB | 4.29 GB | 61.34 GB (26%) | ~10 t/s | FITS |
| Q8_08.5 bpw | 28.83 GB | 4.29 GB | 34.88 GB (15%) | ~19 t/s | FITS |
| Q6_K6.56 bpw | 22.3 GB | 4.29 GB | 28.12 GB (12%) | ~24 t/s | FITS |
| Q5_K_M5.68 bpw | 19.31 GB | 4.29 GB | 25.03 GB (11%) | ~28 t/s | FITS |
| Q4_K_M4.8 bpw | 16.32 GB | 4.29 GB | 21.93 GB (9%) | ~33 t/s | FITS |
| FP44.25 bpw | 14.42 GB | 4.29 GB | 19.96 GB (8%) | ~37 t/s | FITS |
| IQ3_XS3.3 bpw | 11.15 GB | 4.29 GB | 16.58 GB (7%) | ~47 t/s | FITS |
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All Open-Weights Models Tested on Apple Mac Studio M5 Ultra (256GB Unified Memory) (Q4_K_M @ 32K Context)
Standard Q4_K_M precision with 32K context window and Q8_0 KV cache
| Model | Architecture | Total VRAM Needed | Headroom | Est. Decode Speed | Compatibility | Detailed Config |
|---|---|---|---|---|---|---|
| Qwen 3.8 27B Instruct Alibaba Cloud | 27.2B Dense | 21.93 GB(9%) | +214.07 GB | ~33 tok/s | โ FITS | Configure CLI โ |
| Qwen 3.6 35B-A3B MoE Alibaba Cloud | 35B MoE | 24.1 GB(10%) | +211.9 GB | ~259 tok/s | โ FITS | Configure CLI โ |
| DeepSeek-V4.1-Flash (552B Engram MoE) DeepSeek | 552B MoE | 345.59 GB(146%) | -109.59 GB | 0 (OOM) | โ OOM | Configure CLI โ |
| Meta Muse Spark Open (816B-A42B MoE) Meta AI | 816B MoE | 512.86 GB(217%) | -276.86 GB | 0 (OOM) | โ OOM | Configure CLI โ |
| Google Gemma 4 26B MoE Google | 26.4B MoE | 20.23 GB(9%) | +215.77 GB | ~173 tok/s | โ FITS | Configure CLI โ |
| Google Gemma 4 E4B (Edge 4B) Google | 4.1B Dense | 4.24 GB(2%) | +231.76 GB | ~211 tok/s | โ FITS | Configure CLI โ |
| DeepSeek-R1 Distill Qwen 32B DeepSeek | 32.8B Dense | 25.41 GB(11%) | +210.59 GB | ~28 tok/s | โ FITS | Configure CLI โ |
| DeepSeek-R1 Distill Qwen 14B DeepSeek | 14.8B Dense | 13.16 GB(6%) | +222.84 GB | ~59 tok/s | โ FITS | Configure CLI โ |
| Meta Llama 4 Scout (109B-A17B MoE) Meta AI | 109B MoE | 71.66 GB(30%) | +164.34 GB | ~52 tok/s | โ FITS | Configure CLI โ |
| Meta Llama 3.3 70B Instruct Meta AI | 70.6B Dense | 49.96 GB(21%) | +186.04 GB | ~13 tok/s | โ FITS | Configure CLI โ |
| Meta Llama 3.1 8B Instruct Meta AI | 8B Dense | 7.87 GB(3%) | +228.13 GB | ~107 tok/s | โ FITS | Configure CLI โ |
| Microsoft Phi-4 Mini 3.8B Microsoft | 3.8B Dense | 3.92 GB(2%) | +232.08 GB | ~229 tok/s | โ FITS | Configure CLI โ |