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Qu'est-ce qu'une alimentation électrique ?

L'alimentation électrique est le composant chargé de fournir de l'énergie au reste des composants du PC. C'est donc l'une des pièces basiques et indispensables d'un ordinateur, comme la carte mère, le processeur et la mémoire RAM.Les parties visibles d'une PSU sont le câblage, l'interrupteur marche/arrêt, le ventilateur et le couvercle de tout le circuit intérieur, aspect que nous n'approfondirons pas.Traditionnellement, les alimentations électriques étaient placées à l'arrière en haut de la tour du PC, mais maintenant de nombreuses tours ont placé l'espace pour l'alimentation électrique en bas pour faciliter la sortie de l'air chaud.Il est essentiel de choisir une alimentation électrique PSU d'une puissance suffisante pour alimenter tous les composants de l'ordinateur. Une PSU de faible puissance peut entraîner des redémarrages ou des blocages du système par mesure de sécurité. Cependant, il ne faut pas non plus choisir un modèle excessivement puissant, car s'il fonctionne avec une faible charge de travail, des pannes apparaîtront également. L'idéal est qu'une alimentation électrique fonctionne entre 50 et 80 % de sa puissance maximale. En dessous de 50 %, nous pouvons subir des blocages et dépasser constamment les 80 % peut provoquer une détérioration prématurée des éléments de notre PSU.La consommation moyenne d'un ordinateur basique oscille entre 200 et 400 W, un poste de travail et un PC de jeu standard entre 300 et 600 et un PC Master Race conçu pour fournir un effort graphique total peut partir de 500 W et plus.Compte tenu de cette recommandation selon laquelle la puissance minimale doit être de 50 % de la puissance maximale, si nous constatons qu'un PC qui consomme 250 W nécessite de penser à des alimentations électriques entre 450 W et 500 W. Dans un PC de jeu, la PSU devrait osciller entre 550 W et 650 W environ.

Types d'alimentations électriques : modulaires et semi-modulaires

Une fois la puissance sélectionnée, nous pouvons choisir entre des alimentations électriques standard, modulaires ou semi-modulaires.La différence entre les différents types de sources réside dans le câblage.

Alors que les standards disposent de tout le câblage préinstallé et prêt à l'emploi, une source modulaire dispose de différentes entrées pour que vous ne connectiez que les câbles dont vous avez besoin, vous permettant ainsi une plus grande personnalisation et évitant l'excès de câbles dans votre PC.
Les alimentations électriques semi-modulaires sont une combinaison des modèles précédents qui fusionne les concepts et nous offre un câblage minimal pour les composants de base et les connexions dans la source où coupler de nouveaux câbles au cas où nous aurions besoin d'ajouter des composants supplémentaires.

Certification 80 Plus : Bronze, Argent, Or, Platine et Titane

La manière de contrôler que la puissance indiquée dans une alimentation électrique pour PC est correcte est de se conformer aux exigences du certificat 80 Plus.La certification 80 Plus est un programme qui promeut l'utilisation efficace de l'énergie dans les PSU.80 Plus a été choisi parce que ses tests certifient que les produits portant ce label dépassent les 80 % d'efficacité énergétique (que plus de 80 % de l'électricité consommée est destinée à fournir de l'énergie aux composants), réduisant à 20 % ou moins l'énergie « perdue » sous forme de chaleur.

Tableau d'efficacité du certificat 80 Plus

	Efficacité	Blanc	Bronze	Argent	Or	Platine	Titane
Charge
20 %	80 %	82 %	85 %	87	90 %	94 %
50 %	80 %	85 %	88 %	90 %	92 %	96 %
100 %	80 %	82 %	85 %	87 %	97 %	91 %

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