Rent a GPU

Can the Apple M3 Ultra (256GB) run DeepSeek V4.1 Flash?

Apple M3 Ultra (256GB) × DeepSeek V4.1 Flash8K context
NoDoes not fit in memory
Memory at Q4_K_M463.4 GB of 192 GB
Weights 462.6 GBKV cache 0.2 GBRuntime 0.6 GB
  1. FP16
  2. Q8_0
  3. Q6_K
  4. Q5_K_M
  5. Q4_K_M
  6. Q3_K_M
  7. Q2_K

No. Even at Q4_K_M, DeepSeek V4.1 Flash needs about 463.4 GB, but the Apple M3 Ultra (256GB) has 192 GB usable. You could offload some layers to system RAM, but it will be very slow.

Try other context lengths

Run it in the cloud

Too big for the Apple M3 Ultra (256GB)? Run DeepSeek V4.1 Flash on a rented GPU instead.

Rent a cloud GPU by the hour. No upfront cost, stop any time. Not sure whether to rent or buy? Compare the cost.

Rent a GPU on RunPodRent a GPU on Vast.ai

Memory needed by quantization

At 8,192 tokens of context. The black line marks the 192 GB the Apple M3 Ultra (256GB) can use. macOS lets the GPU use about 192 GB of the 256 GB unified memory by default.

QuantQualityMemoryFits?Speed
FP16Full quality1526.8 GBToo big—
Q8_0Near-lossless811.5 GBToo big—
Q6_KExcellent626.4 GBToo big—
Q5_K_MVery good543.5 GBToo big—
Q4_K_MGood, most popular463.4 GBToo big—
Q3_K_MNoticeably degraded373.7 GBToo big—
Q2_KHeavily degraded286.9 GBToo big—

Measured speed from real Apple M3 Ultra (256GB) owners

Tokens per second that people measured on their own Apple M3 Ultra (256GB), next to our estimate.

No one has measured DeepSeek V4.1 Flash on the Apple M3 Ultra (256GB) yet. The speeds above are estimates. Run the benchmark and yours becomes the first real number on this page.

Have an Apple M3 Ultra (256GB)? Add your real speed

One command times DeepSeek V4.1 Flash in your own Ollama, shows you exactly what it would send, and asks before sending anything. No sign-up, no personal data.

macOS and Linux

curl -fsSL https://gpufit.dev/bench.sh | sh

Windows (PowerShell)

irm https://gpufit.dev/bench.ps1 | iex

How the benchmark works

Models that run well on the Apple M3 Ultra (256GB)

Frequently asked questions

Can Apple M3 Ultra (256GB) run DeepSeek V4.1 Flash?

No. Even at Q4_K_M, DeepSeek V4.1 Flash needs about 463.4 GB, but the Apple M3 Ultra (256GB) has 192 GB usable. You could offload some layers to system RAM, but it will be very slow.

How much VRAM does DeepSeek V4.1 Flash need?

About 463.4 GB at Q4_K_M with 8,192 tokens of context, and about 1526.8 GB at full FP16 precision.

How fast is DeepSeek V4.1 Flash on the Apple M3 Ultra (256GB)?

It does not fit in the Apple M3 Ultra (256GB)'s memory, so most layers would run from system RAM and generation would be very slow.