Having owned an Enermax PSU (the exact same model you're considering) which failed taking the motherboard connector with it in a molten heap (connectors fused together), I suggest a different brand. I've been looking for replacements for the Enermax and the Enhance 460 Watt was recommended by my motherboard supplier. It is ATX 2.03 compliant so you would need one of those converter cables to make it work with a non ATX spec Dell motherboard. Interestingly, the supplier used to sell the Enermax PSUs but now he doesn't recommend them for use with my motherboard type (Tyan Tiger MP) because they can have problems maintaining the +5 Volt line voltage. Mine died precisely due to this problem. Just before it gave up completely, I noticed in Tyan System Monitor that the +5V line was actually reading about 4.4V (I had already contacted the local Enermax people by this point due to suspected PSU problems - spontaneous reboots/crashes). The Enhance 460 Watt PSUs are reputedly exceptionally quiet - more so than the Enermax whisper PSU (I found it listed on a website devoted to bits for quietening your PC). I've ordered one of these PSUs and it should be with me in a few days. I'll be able to hear for myself just how quiet it is.