ive owned a few 3000.1,s and they were stable at .5 ohms so i would have to say the 5000.1 is also but ive never owned one of those before....if you run it at .5 make sure you have sufficient electrical upgrades and i wouldnt take the gain over .75
I have 2 150 amp alternators, an MLA module, and 2 odyssey 2150s.. im not sure how much power its going to draw at .5 but I think that should be enough