What kind of PSU's do companies like HP and Dell use in the Business products? They obviously have to be reliable, but as someone who builds custom PCs for both home and business use, I always tend to go for branded PSU's (due to popular advice) to prevent them failing. I tend to avoid non-brand ones, and go for brands like Thermaltake, Corsair, etc. But now I feel these consumer PSU's may just be too expensive. Surely PSUs in business PC's have to be reliable (especially higher end business systems for things like graphics use), and I don't think HP and Dell in that scenario would be using gaming-spec PSUs. So what kind do they use where I can avoid the bells and whistles and attractive designs, but still have a 500+W PSU which is a "reliable" long term one?