heyhey Dan
I'm not at all a expert. (Hope someone with hands on exp jump in)
But from what I've seen what components are used inside the psu are significantly more important then the cert'
Example:
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html
I just happen to own the only Bronze in the top tier.
A XfX xxx ed' 650 modular.
Also I noticed on that list. The Ts is gold and bronze...
Take this with extreme grain of salt. But Maybe they pushed the product out the door before geting gold cert? in which case there is no diffrence except one has a gold sticker and one doesnt.
Thast pure speculation!!
Either way thats a very good quality psu. you wont be disappointed.