RTX 5090 vs Mac Studio M3 Ultra voor lokale LLMs
DO
Damien · LocalIATwee filosofieen en twee winnaars per use case: dedicated VRAM vs unified memory, throughput, multi-user serving en EUR per GB.
NVIDIA en Apple lossen lokale LLMs anders op: snelle dedicated VRAM en CUDA-tooling tegenover enorme unified memory en een stille desktop.
Kort gezegd
| RTX 5090 | 32 GB dedicated VRAM | Snel, CUDA-native, sterk voor serving en batching. |
| Mac Studio M3 Ultra | tot 512 GB unified memory | Trager, stil, laadt enorme modellen. |
Wie wint per use case
- Modellen onder 70B met meerdere gebruikers: NVIDIA.
- Zeer grote modellen voor een of twee gebruikers: Mac Studio.
- Fine-tuning en productie-tooling: NVIDIA door CUDA.
- Stille onderzoekswerkplek: Mac Studio.
De beste machine past bij de workload, niet bij de luidste benchmark.
Open de calculator / vraag ons om advies met doelmodel, gebruikers en randvoorwaarden.
Veelgestelde vragen
RTX 5090 or Mac Studio M3 Ultra to run a local LLM?+
The RTX 5090 (32 GB dedicated VRAM) wins on throughput and multi-user (vLLM batching). The Mac Studio M3 Ultra (up to 512 GB unified) wins on the ability to load very large models for 1-2 users.
What is the best GPU to serve Llama 70B to 5 users?+
2x RTX 5090 (64 GB total VRAM) with vLLM. A single 5090 is tight for 70B Q3, but 2x 5090 allow comfortable Q5_K_M plus batching of 5-10 concurrent requests at ~30-40 tok/s combined.
Can the Mac Studio M3 Ultra run Mistral Large 123B?+
Yes, in Q5_K_M it fits comfortably in 96-128 GB unified. Single-user speed ~15-25 tok/s. Downside: no efficient batching (Metal Performance Shaders are less mature than CUDA), so it cannot handle 5+ concurrent users.
Which rig for a GDPR-sensitive law firm?+
Recommendation: an Enterprise build (2x RTX A6000 NVLink, 96 GB VRAM, ECC RAM). A Mac Studio is fine for a solo lawyer but not for 5+ concurrent users. RTX A6000 with ECC is server-grade, matching GDPR/AI Act expectations.
What is the cost per GB of VRAM in 2026?+
RTX 5090: ~EUR 110/GB. RTX A6000: ~EUR 145/GB. Mac Studio M3 Ultra 256 GB: ~EUR 24/GB, but with roughly 3x lower throughput.
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