Mixtral 8x22B on Mac Studio M1 Max 64 GB
140.63B (39B active) on 64 GB at 400 GB/s. Hardware details · Model details
No calculated fit. Mixtral 8x22B does not fit under standard overhead assumptions at
MLX 4-bit: the model calculates 81.7 GB required against 54.4 GB usable.CompatibilityDoes not fit
Calculated fit
No
Calculated Requires more than 97% of usable memory. Needs a smaller quantization or more memory.
Smallest catalogued quantization
MLX 4-bit
Calculated mlx
Memory required
81.7 GB
Calculated of 54.4 GB usable — 150%
Max practical context
0
Calculated model supports 64K
Memory budget at 8K context
Model weights ⓘ
76.6 GB Calculated
KV cache ⓘ
1.8 GB Calculated
Runtime overhead ⓘ
3.3 GB Estimated
Total required
81.7 GB Calculated
Headroom ⓘ
-27.3 GB Calculated
No quantization in our catalogue fits this machine.
Unified memory: weights, KV cache and the OS share the same 64 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 140.63B parameters must be resident in memory even though only ~39B are active per token. Memory follows total parameters; speed follows active parameters.
Performance
Estimated performance · recommended MLX 4-bit
Decode, prefill and TTFT below are estimates for MLX 4-bit. We do not have a comparable MLX 4-bit measurement on this machine.
Estimated decode
—
Estimated MLX 4-bit; calculated range
Estimated prefill
—
Estimated MLX 4-bit; calculated range
Estimated TTFT at 8K
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Estimated MLX 4-bit; calculated range
Hardware load reference
—
Official spec hardware TDP; not this model run
No throughput figures for this configuration. We do not estimate performance for a model that cannot load.
How the estimate is calculated
- Decode: reading 39.0B active parameters at 4.50 bits/weight takes 78.35 ms at 400 GB/s x 70% achieved efficiency.
- MoE routing penalty of 15% applied: expert gathers are less bandwidth-efficient than a dense sweep.
- MoE decode depends on how well the engine batches expert gathers; real results vary more than for dense models.
- No FP16 compute figure for this hardware, so prefill cannot be estimated.
- 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.
Submit a benchmarkSubmissions stay pending until reviewed.
This model at other quantizations on this machine
| Quantization | Resident | Disk | Total needed | Utilisation | Fit | Max context |
|---|---|---|---|---|---|---|
MLX 4-bitsmallest listed | 76.6 GB | 76.6 GB | 81.7 GB | 150% | Does not fit | 0 |
Q4_K_M | 81.8 GB | 81.8 GB | 87.0 GB | 160% | Does not fit | 0 |
Q5_K_M | 95.9 GB | 95.9 GB | 101.6 GB | 187% | Does not fit | 0 |
Q8_0 | 141.9 GB | 141.9 GB | 148.9 GB | 274% | Does not fit | 0 |
BF16 | 261.9 GB | 261.9 GB | 272.6 GB | 501% | Does not fit | 0 |
Cost of running Mixtral 8x22B on this machineUnited States (federal) · C corporation · 8h/day
Monthly economic cost
$0
Calculated after tax
Codex/Claude Code
$100/mo
≈ $100/mo · local is $100 less
Net cash at purchase
$0
Calculated VAT not reclaimable
Total over 5 years
$0
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 0 over 5 years, straight-line to a 0 residual | $0.00 |
| Electricity 0.0 kWh/month at 0.140/kWh | $0.00 |
| Monthly cost before tax | $0.00 |
| Electricity tax shield Running costs are deductible business expenses | -$0.00 |
| Monthly economic cost after tax | $0.00 |
Three different numbers, deliberately
Cash cost
$0
Money that leaves the bank account on day one, net of reclaimable VAT.
Accounting depreciation
$0.00/month
$0 written down over 5 years to a $0 residual.
After-tax economic cost
$0.00/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
$0 (30%) Assumption
Extrapolated from the three-year curve.
Electricity
$0.000/kWh Assumption
Average power draw
0 W Calculated
Load — for 20% of powered hours, idle 0 W for the rest — a machine that is on is not generating tokens the whole time.
Investment allowances
§179 100.0% Official spec
Worth $0 in total — first-year expensing that replaces later tax depreciation.
Cost of capital
not applied 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.
Mixtral 8x22B on other hardware
| Hardware | Decode | Price | Fit |
|---|
Nearest alternatives to the Mac Studio M1 Max 64 GB