I'm pretty sure it's enough for refrerence 7870 but will 30a on 12v be enough for the gigabyte version of the 7870.
If you're wondering the psu in question is an antec vp550p
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More aboutrail gigabyte 7870
The Antec VP 550 actually has multiple 12v rails capable of supplying 540 watts on the 12v rail alone making for 45 combined amps on the 12v rail. It's a very good power supply and would be fine even for a GTX 680 or HD 7970.