Assuming higher intelligence could form on a conventional computer (I have a pet theory it requires some true randomness, which would imply either connecting to some fancy radioactive-decay-random-number-generator-hardware or quantum computers), I think it's possible. Because I think it's possible that, failing anything else, you could construct a Turing machine inside Darwinbots.
That said, if you're looking for it to actually evolve, I think we need far more processing power and memory on our actual computers running it. You're just not going to get anywhere with single digit Ghz and a few gigs of RAM.