HARDWARE FIT CHECK • DeepSeek-V4.1-Flash (552B Engram MoE) + Apple Mac Studio M5 Ultra (256GB Unified Memory)345.59 GB / 236 GB VRAM

Can I Run DeepSeek-V4.1-Flash (552B Engram MoE) on Apple Mac Studio M5 Ultra (256GB Unified Memory)?

Full VRAM footprint analysis, tokens/sec generation benchmark, and copy-paste Ollama & vLLM runtime commands for running DeepSeek-V4.1-Flash (552B Engram MoE) (552B) on Apple Mac Studio M5 Ultra (256GB Unified Memory) (236 GB).

❌ Out of Memory (OOM) — Exceeds Hardware VRAM345.59 GB (146%)0 t/s

Model & Target Hardware

interactive

Model552B MoE

Frontier SWE Coding (77.0 DeepSWE), 1M Context & 3D/Game Synthesis

Target Hardware236GB • 890 GB/s

▼ Fine-Tune Precision (Q4_K_M, 32K ctx, Q8_0 KV)quant / context

DeepSeek-V4.1-Flash (552B Engram MoE) on Apple Mac Studio M5 Ultra (256GB Unified Memory)

✕ Out of Memory — Exceeds VRAM Capacity

✕ OOM

Required VRAM

345.59 GB

146% of hardware capacity (236 GB)

Est. Decode Speed

0 tok/s

16B active params @ 890 GB/s

Available Headroom

-109.59 GB

Needs +109.59 GB more VRAM

Memory Allocation & Headroom

345.59 GB allocated of 236 GB capacity

146% utilized

Weights: 331.2 GB

KV: (32K): 2.05 GB

Overhead: 12.34 GB

Deficit: -109.59 GB

⚡ Architecture & Throughput Transparency: Single-user decode speed (~0 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 (~0 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 deepseek-v4.1-flash:552b

⚠️ Out of VRAM? Don't downgrade model quality.

Out of VRAM

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Quantization Precision Matrix

32K ctx • KV: Q8_0

Quantization	Weights	KV Cache	Total VRAM	Est. Speed	Fit Status
FP1616 bpw	1104 GB	2.05 GB	1145.44 GB (485%)	0 t/s	OOM
Q8_08.5 bpw	585.12 GB	2.05 GB	608.4 GB (258%)	0 t/s	OOM
Q6_K6.56 bpw	452.64 GB	2.05 GB	471.28 GB (200%)	0 t/s	OOM
Q5_K_M5.68 bpw	391.92 GB	2.05 GB	408.44 GB (173%)	0 t/s	OOM
Q4_K_M4.8 bpw	331.2 GB	2.05 GB	345.59 GB (146%)	0 t/s	OOM
FP44.25 bpw	292.56 GB	2.05 GB	305.6 GB (129%)	~14 t/s	PARTIAL
IQ3_XS3.3 bpw	226.32 GB	2.05 GB	237.04 GB (100%)	~18 t/s	PARTIAL