Does vCenter 4.0 chargeback allow the chargeback based on CPU cycles used? If I upgrade a vCenter to v4.0 to manage ESX 3.5 hosts will I be able to perform chargeback modelling on those hosts?
that would be a nice feature, may be we have to wait until the product is actually released
Does vCenter 4.0 chargeback allow the chargeback based on CPU cycles used?
Yes. You can set your CPU costs per GHz-Hour and then vCenter Chargeback will allow chargeback based on used CPU cycles. Please choose appropriate billing policy that includes "Actual Usage" to be considered.
If I upgrade a vCenter to v4.0 to manage ESX 3.5 hosts will I be able to perform chargeback modelling on those hosts?
Yes. vCenter Chargeback supports any ESX hosts managed by vCenter Server 2.5 U3 and above, that includes vSphere 4.0.