Does DeepSeek-V4 Flash fit on a Mac Studio M5 Ultra 96 GB?

No. At the smallest quantization we list it still needs about 172 GB against roughly 82 GB usable.

How fast is DeepSeek-V4 Flash on a Mac Studio M5 Ultra 96 GB?

We estimate — of decode throughput. This is calculated from memory bandwidth and active parameter count, not measured, so it is shown as a range.

What does it cost to run DeepSeek-V4 Flash on a Mac Studio M5 Ultra 96 GB?

The default US federal estimate is about $62 per month as a C corporation at 8 hours a day, including depreciation, electricity and tax relief. Use the selector for an interactive country estimate.

DeepSeek-V4 Flash on Mac Studio M5 Ultra 96 GB

304.18B (13B active) on 96 GB at 1,200 GB/s. Hardware details · Model details

Country

Buyer

Usage

CompatibilityDoes not fit

Fits

Calculated Requires more than 97% of usable memory. Needs a smaller quantization or more memory.

Recommended quantization

MLX 4-bit

Calculated mlx

Memory required

172.4 GB

Calculated of 81.6 GB usable — 211%

Max practical context

Calculated model supports 1M

Memory budget at 8K context

Model weights ⓘ

165.7 GB Calculated

KV cache ⓘ

0.7 GB Calculated

Runtime overhead ⓘ

6.0 GB Estimated

Total required

172.4 GB Calculated

Usable memory ⓘ

81.6 GB Assumption

Headroom

-90.8 GB Calculated

No quantization in our catalogue fits this machine.

Unified memory: weights, KV cache and the OS share the same 96 GB pool. We assume 85% is addressable by the GPU, which matches a headless machine with the wired-memory limit raised.

Mixture of experts: all 304.18B parameters must be resident in memory even though only ~13B are active per token. Memory follows total parameters; speed follows active parameters.

PerformanceEstimated0/10

Decode (generation)

—

Estimated calculated, not measured

Prefill (prompt)

—

Estimated

TTFT at 8K

~10.7–22.3 s

Estimated time to first token

Power while generating

190 W

Measured

No throughput figures for this pairing. We do not estimate performance for a model that cannot load: a tokens-per-second number for a configuration that will never run is noise, not data. The alternatives below are machines that can actually run DeepSeek-V4 Flash.

How the estimate is calculated

Decode: reading 13.0B active parameters at 4.50 bits/weight takes 6.95 ms at 1200 GB/s x 88% achieved efficiency.
MoE routing penalty of 15% applied: expert gathers are less bandwidth-efficient than a dense sweep.
Prefill: 192 TFLOPS (FP16) x 1.69 calibrated against measured prefill on this platform x 22% assumed model-FLOPs utilisation, divided by 2 x 62.9B parameters per token.
Prefill uses 62.9B effective parameters, not the 13B active in decode: a batch of hundreds of tokens routes across most of the expert pool.

MoE decode depends on how well the engine batches expert gathers; real results vary more than for dense models.
Prefill throughput is highly engine-dependent. Flash attention, batch size and quantized KV all move this number substantially, and for sparse mixture-of-experts models it is the least reliable figure we produce.
This is a calculated estimate, not a measurement. It assumes a single request, a short prompt, no speculative decoding and a warm model already resident in memory.

Estimator version estimator_v1. Stored with every estimated row so old estimates can be regenerated when the model improves.

This model at other quantizations on this machine

Quantization	Weights	Total needed	Utilisation	Fit
`MLX 4-bit`recommended	165.7 GB	172.4 GB	211%	Does not fit
`Q4_K_M`	176.9 GB	183.9 GB	225%	Does not fit
`Q8_0`	307.0 GB	317.9 GB	390%	Does not fit

Cost of running DeepSeek-V4 Flash on this machineUnited States (federal) · C corporation · 8h/day

Monthly economic cost

$62

Calculated after tax

Codex/Claude Code

$100/mo

≈ $100/mo · local is $38 less

Net cash at purchase

$5,945

Calculated VAT not reclaimable

Total over 5 years

$3,741

Calculated after tax, after resale

Cost per USD/1M tokens

—

Calculated

The $100 comparison uses the Codex Pro 5x / Claude Max 5x plans. A fixed planning conversion is used for USD. This compares monthly spend only: subscriptions have usage limits, local hardware has different capabilities and constraints, and taxes or regional pricing may change the charged amount. Prices checked 7 September 2026.

Monthly breakdown

Depreciation 4,161 over 5 years, straight-line to a 1,783 residual	$69.35
Electricity 8.4 kWh/month at 0.140/kWh	$1.17
Cost of capital 4.0%/yr on 3,864 average capital employed	$12.88
Monthly cost before tax	$83.41
Electricity tax shield Running costs are deductible business expenses	−$0.25
First-year expensing §179 (100.0%)	−$20.81
Monthly economic cost after tax	$62.35

Three different numbers, deliberately

Cash cost

$5,945

Money that leaves the bank account on day one, net of reclaimable VAT.

Accounting depreciation

$69.35/month

$4,161 written down over 5 years to a $1,783 residual.

After-tax economic cost

$62.35/month

Depreciation plus running costs plus cost of capital, less the tax those deductions save. This is the figure to compare between machines.

Assumptions and sources (verified 2026-09-07)

VAT rate

0% Official spec

VAT recoverable

0% Official spec

Federal C-corporation estimate at the flat 21% rate. Pass-through entities should use the sole-proprietor estimate as a rougher proxy.

Effective deduction rate

21.00% Calculated

Headline marginal rate 21.00%.

Depreciation

5 years, straight-line Assumption

Residual value

$1,783 (30%) Assumption

Extrapolated from the three-year curve.

Electricity

$0.140/kWh Assumption

Average power draw

48 W Calculated

Load 190 W for 20% of powered hours, idle 12 W for the rest — a machine that is on is not generating tokens the whole time.

Investment allowances

§179 100.0% Official spec

Worth $1,248 in total — first-year expensing that replaces later tax depreciation.

Cost of capital

$12.88/month Assumption

VAT rate: No US federal VAT · verified 2026-09-07
Marginal tax rate: IRS Publication 542 — Corporations · verified 2026-09-07
VAT recoverable fraction: site assumption · verified 2026-09-07
Useful life: IRS Publication 946 — How To Depreciate Property · verified 2026-09-07
Electricity price: Site assumption · verified 2026-09-07

Federal planning estimate only, not tax advice. State and local income tax, sales/use tax and incentives are excluded. It assumes 100% business use, a Section 179 election, enough business income to use it, and that the full annual limit remains available.

DeepSeek-V4 Flash on other hardware

Hardware	Decode	Price	Fit
Mac Studio M5 Ultra 256 GB	~89.3–129 t/s	€9.599	Comfortable
Mac Studio M3 Ultra 256 GB	~51.8–74.5 t/s	€6.299	Comfortable
Mac Studio M5 Ultra 512 GB	~49.8–71.7 t/s	€12.599	Comfortable
Mac Studio M3 Ultra 512 GB	~28.3–40.7 t/s	€9.199	Comfortable

Nearest alternatives to the Mac Studio M5 Ultra 96 GB

DeepSeek-V4 Flash on Mac Studio M5 Max 128 GB128 GB DeepSeek-V4 Flash on Mac Studio M5 Max 64 GB64 GB DeepSeek-V4 Flash on Mac Studio M5 Ultra 256 GB256 GB DeepSeek-V4 Flash on Mac Studio M5 Max 36 GB36 GB DeepSeek-V4 Flash on Mac Studio M5 Ultra 512 GB512 GB

Compare Mac Studio M5 Ultra 96 GB against Mac Studio M5 Max 128 GB →

Page quality score (why this page is or is not indexed)

6/13 — marked noindex. Generated pages are gated so we do not ask a search engine to rank a page with nothing computed to say. The directive is emitted in the page head via the metadata API, not in the body, so it is authoritative.

Has a memory-fit calculation (+3)
Has a price (+2)
Has an ownership economics calculation (+2)
Well connected (15 internal links) (+1)
No benchmark or estimate
Model does not fit and there is no measurement to explain why it is worth knowing (-2)
Fails a hard requirement: an indexable page needs both a compatibility calculation and at least one benchmark or estimate.