DeepSeek-R1 671B
DeepSeek-R1 671B loads in 380 GB at Q4_K_M and is comfortable from 256 GB of memory. Below: the full memory math, the cheapest card that runs it well, and the fastest machine we track.
PARAMETERS
671B (37B active)
FORMAT
Q4_K_M
MIN MEMORY
512 GB
BEST FOR
Reasoning, Coding
Memory math
Weights (Q4_K_M)
380 GB
+ KV cache (16k)
~6.0 GB
Total at 16k
~386.0 GB
Comfortable from
256 GB
KV = fp16 estimate (q8_0 cache roughly halves it). "Comfortable" = weights + KV within the engine's tiered budget (~70-85% of memory).
Hardware snapshot
Cheapest GPU
—
no consumer fit
Fastest
—
n/a
Runs on a Mac?
No
beyond current Macs
More DeepSeek models
Frequently asked questions
How much memory does DeepSeek-R1 671B need?
380 GB for the Q4_K_M weights, plus ~6.0 GB of KV-cache at 16k context — about 386.0 GB total. Comfortable from 256 GB of VRAM or unified memory.
Does DeepSeek-R1 671B run on a Mac?
Not on the current Mac configs we track; DeepSeek-R1 671B needs more memory than they offer.
What is the cheapest GPU for DeepSeek-R1 671B?
No tracked consumer GPU runs DeepSeek-R1 671B comfortably.
Cite this page
ModelFit: DeepSeek-R1 671B — specs, memory math and hardware verdicts. https://modelfit.io/models/deepseek-r1-671b/ (dataset updated 2026-09-03, CC BY 4.0).