The commodity-based cluster has changed the HPTC landscape in a significant way. Indeed, clusters have had a disruptive influence on many sectors of the IT market in addition to HPTC. As with most disruptive technologies, clusters promised "faster, better, cheaper" computing. Marketing numbers from IDC seem to support the perception that clusters are delivering on their promise.
However, a closer look reveals that, in reality, the delivery of some of the "cheaper" promise is achieved by shifting certain costs from the traditional HPTC vendor to the customer.