Mac Studio M3 Ultra 512 GB vs Mac Studio M5 Ultra 512 GB
M3 Ultra has 512 GB memory, 819 GB/s bandwidth, 280 W nominal power; M5 Ultra has 512 GB memory, 1,200 GB/s bandwidth, 310 W nominal power. Compare model compatibility, like-for-like tokens/sec and ownership cost below.
Verdict
- throughputThe Mac Studio M5 Ultra 512 GB delivers approximately 78% higher aggregate decode throughput across 3 like-for-like model configurations (same quantization, runtime, context and inference settings).
- capacityBoth machines run all 8 compared models in their best practical configurations. Compare their quantizations and evidence labels before treating any throughput difference as a hardware result.
- costAt 8 hours a day, the Mac Studio M3 Ultra 512 GB has approximately 27% lower total monthly cost ($87 against $118), for a C corporation in United States (federal).
- evidenceAll 3 like-for-like throughput rows are estimates. Treat the ranking as indicative and the margins as uncertain.
- recommendationThere is no single answer: the Mac Studio M5 Ultra 512 GB is faster, the Mac Studio M3 Ultra 512 GB is cheaper to own, and the Mac Studio M5 Ultra 512 GB gives more throughput per unit of purchase currency. Pick on whichever constraint actually binds you — interactive latency, monthly budget, or capacity headroom for larger models later.
Every statement above is generated from the calculations on this page by fixed rules — no prose is written for individual comparisons. If the numbers change, the verdict changes with them.
Hardware
| Mac Studio M3 Ultra 512 GB | Mac Studio M5 Ultra 512 GB | |
|---|---|---|
| Purchase price estimate | $8,287 * | $11,350 * |
| Memory | 512 GB | 512 GB |
| Memory bandwidth | 819 GB/s | 1,200 GB/s |
| Usable bandwidth indicator | 580 GB/s (71%) | 1,052 GB/s (88%) |
| Nominal power | 280 W | 310 W |
| Measured load power | 205 W | 225 W |
| Idle power | 13 W | 14 W |
| Architecture | unified memory | unified memory |
Like-for-like performance3 comparable models
MiniMax M3GLM-5.3 FlashTernary Bonsai 2 27BDeepSeek-V4.1 FlashDeepSeek-V3.2DeepSeek V3 671B-A37BDeepSeek R1 671B-A37BMiniMax Text 01 456B-A46B
| Model | Mac Studio M3 Ultra 512 GB | Mac Studio M5 Ultra 512 GB | Winner |
|---|---|---|---|
| MiniMax M3 427.04B (23B active) | ~24–34.5 t/s Q5_K_M | ~42.5–61.1 t/s Q5_K_M | Mac Studio M5 Ultra 512 GB +77% estimated · estimator_v1 · 8K context |
| GLM-5.3 Flash 321.323B (18B active) | ~20.6–29.7 t/s Q8_0 | ~36.6–52.7 t/s Q8_0 | Mac Studio M5 Ultra 512 GB +78% estimated · estimator_v1 · 8K context |
| Ternary Bonsai 2 27B 27.36B | — no matched configuration | — no matched configuration | Not comparable |
| DeepSeek-V4.1 Flash 763.205B (16B active) | — no matched configuration | — no matched configuration | Not comparable |
| DeepSeek-V3.2 685.397B (37B active) | ~17.6–25.4 t/s Q4_K_M | ~31.4–45.2 t/s Q4_K_M | Mac Studio M5 Ultra 512 GB +78% estimated · estimator_v1 · 8K context |
| DeepSeek V3 671B-A37B 684.531B (37B active) | — no matched configuration | — no matched configuration | Not comparable |
| DeepSeek R1 671B-A37B 684.49B (37B active) | — no matched configuration | — no matched configuration | Not comparable |
| MiniMax Text 01 456B-A46B 456.09B (46B active) | — no matched configuration | — no matched configuration | Not comparable |
Hardware deltas are calculated only when quantization, runtime, exact context, execution/decode mode and relevant inference settings match. Measured and estimated results are never compared to each other. A difference under 10% is reported as a tie.
Best practical configuration
| Model | Mac Studio M3 Ultra 512 GB | Mac Studio M5 Ultra 512 GB | Practical result |
|---|---|---|---|
| MiniMax M3 | ~24–34.5 t/s Q5_K_M · estimated | ~42.5–61.1 t/s Q5_K_M · estimated | Both fit; configurations may differ |
| GLM-5.3 Flash | ~20.6–29.7 t/s Q8_0 · estimated | ~36.6–52.7 t/s Q8_0 · estimated | Both fit; configurations may differ |
| Ternary Bonsai 2 27B | — PTQ1_0 · estimated | — PTQ1_0 · estimated | Both fit; configurations may differ |
| DeepSeek-V4.1 Flash | — DS4 V4.1 Q2 (SSD) · estimated | — DS4 V4.1 Q2 (SSD) · estimated | Both fit; configurations may differ |
| DeepSeek-V3.2 | ~19–27.3 t/s MLX 4-bit · estimated | ~33.8–48.6 t/s MLX 4-bit · estimated | Both fit; configurations may differ |
| DeepSeek V3 671B-A37B | — MLX 4-bit · estimated | — MLX 4-bit · estimated | Both fit; configurations may differ |
| DeepSeek R1 671B-A37B | — MLX 4-bit · estimated | — MLX 4-bit · estimated | Both fit; configurations may differ |
| MiniMax Text 01 456B-A46B | — Q5_K_M · estimated | — Q5_K_M · estimated | Both fit; configurations may differ |
This is a deployment comparison: each machine uses its own recommended configuration. Different quantizations can change speed and quality, so these figures are not raw hardware benchmarks.
Economics — United States (federal), C corporation, 8h/day
| Mac Studio M3 Ultra 512 GB | Mac Studio M5 Ultra 512 GB | |
|---|---|---|
| Purchase price estimate | $8,287 | $11,350 |
| Reclaimable VAT | $0 | $0 |
| Net cash at purchase | $8,287 | $11,350 |
| Monthly depreciation | $96.68 | $132.41 |
| Monthly electricity | $1.27 (9 kWh) | $1.38 (10 kWh) |
| Tax programme | §179 100.0% | §179 100.0% |
| Tax-programme benefit | $1,740 | $2,383 |
| Monthly economic cost | $86.63 | $118.37 |
| Total over 5 years | $5,198 | $7,102 |
Purchase prices are localized inputs in USD: tax/VAT excluded for Mac Studio M3 Ultra 512 GB and tax/VAT excluded for Mac Studio M5 Ultra 512 GB. Net cash and monthly economic cost then apply the selected United States (federal) / C corporation tax treatment. Tax assumptions last 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.