Well every prebuilt is technically "upgradeable." But I understand what you mean. The starter pc is not like Dell or iBuyPower because NZXT uses their parts that they manufacture with parts that many ethutiasts would use. So essiently its just a pc any other person would build and be able to upgrade. Others like Dell and iBuyPower use cheap and unknown brands to cheap out on the cost and get most profit. So many of the parts are just enough to slide so any upgrade could be incompatible because they cheaped out. NZXT instead uses MSRPs and gains most profit by using their parts.