RTX 5090 vs Mac Studio M3 Ultra per LLM locali
DO
Damien · LocalIADue filosofie e due vincitori secondo il caso: VRAM dedicata vs memoria unificata, throughput, multiutente ed EUR per GB.
NVIDIA e Apple affrontano gli LLM locali in modo diverso: VRAM dedicata rapida e CUDA da un lato, memoria unificata enorme e desktop silenzioso dall'altro.
In breve
| RTX 5090 | 32 GB VRAM dedicata | Veloce, CUDA, ottima per serving e batch. |
| Mac Studio M3 Ultra | fino a 512 GB unificati | Piu lento, silenzioso, carica modelli enormi. |
Chi vince per caso d'uso
- Modelli sotto 70B con piu utenti: NVIDIA.
- Modelli enormi per uno o due utenti: Mac Studio.
- Fine-tuning e produzione: NVIDIA grazie a CUDA.
- Workstation silenziosa da ricerca: Mac Studio.
La macchina migliore e quella adatta al carico, non quella con il benchmark piu rumoroso.
Apri il calcolatore / chiedici un consiglio con modello target, utenti e vincoli.
Domande frequenti
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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