Yea it will run fine at 3ohm bridged, as far as power I couldnt be accurate but id assume maybe 500+watts. Maybe more, im sure u know these are underrated...
Im guessing you made a typo cuz its rated at 600x1 @ 4ohms so why would it do less at 3ohms? And yes I am aware that they are underrated. I love the old school Orions/PPIs.
Oh my bad, lol... Well they aint rated for under 4ohms use but I have heard people using them down to 2ohms bridged. Even the manual says its ok for 2ohms bridged. but power I couldnt really say man. I know at 4ohms it will do a lil over 700watts.