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Which will be louder?

I have a little giant 1000, which is 2x500w 4ohm amp and 2 8ohm cabs.

Which would be louder? Running the cabs into one side(500w 4ohm) so they run at 4ohms producing full 500w

or

running each 8 ohm cab through the seperate outputs so each is still 8 ohms and doesn't draw all 500, but uses both outputs?

someone told me that the cabs will run about 300 - 350w at 8ohm, which is a total of 600 -700w. Is this correct?