Even by doing the 'math' it does not mean things will come together and work.
Yes . . . a 16-amp 12-volt rail by theoretical spec has 196w, but your available clean power in a generic brand power supply may be substantially less.
In fact, even with no load on the rail, overall system 'ripple' may be well outside ATX specifications.
OCCT has a feature that will chart system power over load test runs --- it may be a great place for you to start and see how the PSU performs under various loads.
And please remember our new motto at Tom's: Sometimes We Ain't Just As Smart As We Think We Is