I have similar prob
can someone show me how to "join" 2 or more psu?
or give me the link
TIA
http://www.add2psu.com/I'm using one now, works like a champ.
I'll eventually be using dual PS's but don't know if I should go with the add2psu version or this one:

The one pictured above does not require a molex connection and looks cleaner but have a feeling the add2psu version may be better engineered? It has what looks like a relay that must do something?

It kicks the second psu on automatically when powering on the first one. That split plug looked a bit hinky to me which is why I went with the add2psu. You can use multiple add2psu's if needed.