I want to upgrade a Dell Dimension XPS M166s dating from early 1997 (Pentium 166MMX). My plan is to buy an ECS Socket A Motherboard, Duron 1300 Retail boxed processor and 256MB PC133 crucial memory as the "barebones" of a new cheap but effective system. The problem with this is that Dell has been shipping systems with proprietary power supplies for some time so if this system has one of these then I will have to replace it as part of the upgrade. I've found some websites where it states that systems made from September 1998 onwards have the proprietary supplies, but could someone confirm whether this is correct as I don't want to find when I upgrade that I have got a proprietary unit. Is there an easy way to discern which type a power supply is, for my future reference?