On the left-hand side of this slide, you see the graph from the LMH6715 data sheet. This plot shows what kind of Diff Gain/Diff Phase the LMH6715 is capable of even when driving more than one load or four to be exact in this case. You can see that the Diff Gain/Diff Phase numbers are less than .02% and .02 degrees for all loads shown. On the right, you see the Op Amps produced by TI which meet the requirement of having low Diff Gain/Diff Phase errors with multiple loads.