RAM NAS: How much do you need and when to upgrade?
Clear guide to understanding the RAM of a NAS: simple storage, photos, Immich, Docker, multi-apps, compatibility, ECC, DDR4/DDR5 and pre-purchase traps.
À retenir
La RAM ne sert pas qu’à “aller plus vite”
Dans un NAS, la RAM sert surtout à garder de la marge quand plusieurs tâches tournent : indexation des photos, miniatures, base de données Immich, Docker, sauvegardes, apps et utilisateurs. Le bon choix dépend donc de l’usage réel, pas seulement de la fiche technique.
Repère simple
Combien de RAM selon l’usage ?
Ces valeurs sont des repères pratiques. La compatibilité exacte doit toujours être vérifiée modèle par modèle.
Avant achat
Ce qu’il faut vérifier avant d’acheter une barrette
- Le type mémoire exact : DDR4, DDR5, ECC ou non-ECC.
- Le format : souvent SODIMM, mais pas toujours.
- La capacité maximale officielle du NAS.
- La présence d’un slot accessible ou d’une RAM soudée.
- Les références validées par le fabricant ou les retours fiables.
- L’impact potentiel sur le support ou la garantie.
Erreurs fréquentes
Les pièges à éviter
- Acheter une barrette “compatible NAS” sans vérifier le modèle exact.
- Penser que plus de RAM remplace une vraie sauvegarde.
- Confondre cache SSD, stockage et mémoire vive.
- Choisir uniquement le prix le plus bas au détriment de la stabilité.
- Oublier que certaines marques limitent officiellement les upgrades.
Famille qui veut juste stocker
Priorité aux disques fiables, à une sauvegarde externe et à une interface simple. La RAM doit être suffisante, mais ce n’est pas le poste principal.
Photos + sauvegarde mobile
La RAM devient utile pour l’indexation, les miniatures et plusieurs utilisateurs. Une app simple et stable reste plus importante qu’un gros chiffre marketing.
Immich, Docker et services maison
Vise une marge plus large. 8 Go sont une base raisonnable, 16 Go deviennent utiles si plusieurs services tournent en continu.
NAS Easy ne recommande pas encore de barrettes RAM précises tant que les compatibilités officielles, les formats, les capacités maximales et les sources n’ont pas été vérifiés.
#1
The short answer
For a single file NAS, 2 to 4 GB can be enough. For photos and comfortable family use, 4 to 8 GB are more reassuring. For Immich, Docker and several applications, target 8 GB minimum, and 16 GB if you want margin.
#2
Why RAM counts in a NAS
RAM is used for NAS systems, applications, indexes, databases, photo thumbnails, Docker containers and sometimes multimedia services. It does not magically make disks faster, but it prevents the NAS from saturating as soon as several tasks run at the same time.
#3
Single table according to use
Simple storage: 2 to 4 GB. Photos with application manufacturer: 4 to 8 GB. Family Immich: 8 GB minimum comfortable. Docker with multiple apps: 8 to 16 GB. Advanced use, large index or many services: 16 GB or more depending on the NAS.
#4
Simple storage: do not overpay
While your NAS is mainly used to store files, make some backups and share folders, RAM is not necessarily the first criterion. Sometimes it is better to invest in good disks, an external backup and an inverter rather than an excessive RAM.
#5
Family photos: comfort and indexing
Native photo applications can work with a reasonable amount of RAM, but massive import, creation of thumbnails and indexing may require more margin. If several phones save their photos, 4 to 8 GB make the experience more comfortable.
#6
Immich: why 8 GB becomes important
Immich uses several services: application, database, photo processing, miniatures, indexing and sometimes machine learning. With too little RAM, the NAS can slow down, swap or become painful during imports. 8 GB is a reasonable starting point for family use.
#7
Docker: accumulation counts
A Docker application alone may seem light. The problem comes when you add Immich, Paperless, Vaultwarden, Jellyfin, Uptime Kuma, a database, reverse proxy and monitoring tools. Each service consumes a little, and the whole can quickly saturate.
#8
RAM welded, slot accessible or upgrade impossible
Some NAS have welded RAM, others have an accessible slot, and some accept a limited extension. Before purchasing, check the exact model: maximum capacity, memory type, number of slots and official compatibility.
#9
DDR4, DDR5, SODIMM, ECC: Do not buy at random
A RAM bar must match the expected format: SODIMM or other, DDR4 or DDR5, ECC or non-ECC, compatible frequency, voltage. Two similar bars may not work in a stable way in a NAS.
#10
Official or compatible RAM
The official RAM manufacturer is often more expensive but more reassuring on the support side. A compatible RAM can work, but you have to check the user returns, the stability and the possible impact on the warranty. Easy NAS should not recommend a specific bar without verification.
#11
Errors to avoid
Do not buy a bar only because it is cheaper. Do not assume that a model compatible with a NAS is with all NAS of the brand. Do not confuse more RAM with better backup. Remember that stability counts more than technical score.
#12
Easy NAS Recommendation
For simple storage, remain reasonable. For photos, aim for comfort. For Immich and Docker, 8 GB minimum is a good base, 16 GB gives more margin. Before purchasing, always check the official or documented compatibility of the exact model.