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Fiind vitale pentru functionarea optima a unui calculator, sursele asigura alimentarea cu energie electrica a tuturor componentelor. Capacitatea unei surse PC, masurata in watti, trebuie sa fie adecvata nevoilor sistemului, lasand si un mic buffer pentru siguranta. Modelele mai noi si de calitate ofera eficienta energetica inalta, ajungand pana la 80 PLUS Titanium, si au ventilatoare silentioase, contribuind la un mediu de lucru linistit. Modularitatea este un alt aspect important, sursele modulare permitand o organizare mai buna a cablurilor in interiorul carcasei. Este crucial sa alegi o sursa de la un producator recunoscut, pentru a asigura stabilitatea si durabilitatea sistemului pe termen lung. Protectiile integrate impotriva fluctuatiilor de tensiune sunt esentiale.