Ember JS: How ember handles DOM rendering of views for following code:

APP.Model_a = DS.Model.extend({
    name: DS.attr(),
    model_b: DS.hasMany('model_b'),
});
APP.Model_b = DS.Model.extend({
    name: DS.attr(),
});

Above I have two models Model_a and Model_b. In Route I have following model method which is being called after every 5 seconds.

model: function(){
            var model = currentInstance.store.findAll('model_a');
            model.then(function(response){}, function(error){});
            return model;
        }
    },  

After every 5 seconds server sends live data. What is no data is changed from back end? Will Ember still try to re-render the whole view?