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it depends, 3db bandwidth is the point open loop where the gain of the opamp drops by 3db. this is also the half power frequency and for most analog circuits 3db is a good level of suppression, this frequency/gain will change with feedback however, this can be modeled/visualized using bode plots.
If you have the specs of a comercial opamp look at the plot gain versus frequency and check the gain 3dB below the DC gain.
Now, if you're simulating your opamp just perform an AC analysis and plot gain versus frequency and measure the gain in the same way.
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