Seems like the link is not working. Well it has two +12V rails 18A each.
You don't know that. The label says "Maximum power". We have no way of knowing what the total 12 volt power is. And because they are not telling, it's probably pretty bad.
The Apex is junk. Note the voltage selector switch. That means that it is an obsolete design without automatic PFC. Efficiency is probably around 70% instead of the 80% + that more modern PSU's have.
I'd recommend something like a
Corsair 450VX (33 amp 12 volt rail)http://www.newegg.com/Product/Product.aspx?Item=N82E16817139003
or an Antec 500 watt BASIQhttp://www.newegg.com/Product/Product.aspx?Item=N82E16817371004http://www.hardwaresecrets.com/article/792