I'd doubt you could hit 250 consistently. My PC itself ran a 9800GT and a dual core processor @ 2.81ghz and gets some nasty drops at times depending on how many models there are in view. Though it's very old, it was powerful enough to play some modern games at decent framerates.
In addition, my laptop with a core i5 3320m with Intel HD 4000 (surprisingly good for the overall price of the laptop) and I cap at 250 frames with just only a few models in plain sight; after about 6 or 7 the frames begin to decline. Your only upside is that you have 4 cores blasting in, but we're also talking about an APU here.
Now, these are just my experiences, but seeing comparisons to your laptop, it seems it just may not do the job you want it to. Just see what you can do and hope for the best.
