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Power supply amperage ??
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Nacimroc:
I got a name branded cheapo one with no specs! Didn't realise it had that much power! The 2 rail thing is handy to know instead of loading one to death!

Thanks for all the help!
MonMotha:
For grins, here's the ratings from an old 490W supply out of a Compaq server from the late 90s:

3.4V 18A
12V 12A
5V 75A

You could weld with this thing!

Due to the way power in computers works these days (CPU/GPU cores, which consume the most power of everything on the system, use locally generated supplies), a lot of the power has migrated to the 12V rails, but 400W is a LOT of power.

Now, do be aware that, if you have a cheap supply, it's probably not actually good to the claimed ratings for any period of time.  I'd derate it by at least 25%.  This means your 400W supply is more like a 300W supply.  Oh boo hoo, it's still got more juice than you'll ever need just for some LEDs and fans and such.
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