Cell addresses to specify a range, then find value

I have two formulas in two cells that generate a cell address in each.

How do I use the cell address value given in these cells to select a range (in a formula) and then find the highest number in that range?

Example my formulas return the following cell addresses:

E27 & F33

I need the formula to basically say =MAX(E27:F33), but without the manual input - the range in the formula needs to come from the cells with the cell addresses.

Or this =MAX(indirect(A3),Indirect(B3))

But as INDIRECT is a volatile function, you'd want to keep the number of occurances of it to a minimum for the sake of sheet efficiency