The CPU is not a problem because it can be replaced by any sandy Bridge EP. The 2602 is a pre-release product, but you have the 2603.
As for the PSU, that is where the highest concern is. HP probably uses better qualities in the PSU, but Dell XPS had proprietary PSU that would short out components. Most servers and workstation class computer have proprietary design on the PSU. It is part of the nature since they have to fit a lot of power in less space.
Lorsqu'il en aura reçu, il pourra afficher un graphique de sa réputation au fil du temps.
Voici un aperçu de ce à quoi ressemble ce graphique :
Aucun point de réputation obtenu pour l'instant.