Hard to tell much from the published specifications - they're all proprietary to each manufacturer anyway, so can vary a lot from one manufacturer to another. Seems to be sound enough - I've seen some with a little more amperage on the 12v rail. But much of what determines the "quality" of a power supply is largely subjective - is it heavy, does it use good brand capacitors, etc.
I'd just try the new video card with the current P/S, if it acts up, go shopping.