I wouldn't worry unless you are having a problem.
I'm not claiming anything about Enermax power supplies. I was talking about the problem. I had recently read a thread on Usenet about a few people with the same symptom, that is low readings on the 5 volt rail. Since their fix was the same as mine I knew I wasn't alone with this problem. I thought it was worth mentioning. Not everyone had an Enermax power supply.
In my case, I don't know if it is a worn out ATX connector, something wrong with my motherboard, loose socket, substandard pins, a bit of corrosion, or what. I do know that simply pressing on the ATX connector does nothing but if disconnect and reconnect all is fine, at least for a few weeks. It doesn't seem like a loose connection. Really rather odd.
<b>99% is great, unless you are talking about system stability</b>