Capacity on Demand (CoD) is a feature of IBM's Power Systems designed to provide an easier way to upgrade your server resources when the need arises.

The 5Ghz POWER6 processors are considerably more expensive than the 4.2/4.4Ghz alternatives and could be ruled out on grounds of cost on first inspection.  I was called upon by a customer the other day to perform a total cost of ownership study for 5 years including organic growth on a IBM Power p570 system

Included in the TCO calculation were power consumption, services, maintenance, hardware and software costs. The overall result was that the IBM p570 the 5Ghz system proved the lower cost option compared to the 4.2 or 4.4Ghz. The most significant factor was the reduced Oracle licence overhead. 

The higher performance rating of the 5.0Ghz core kept the licence count within the customers current licence entitlement that had been agreed with the POWER5 cores (0.75 licences per core compared with 1 per core for POWER6).

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