If the amount of vRAM that is available in the vRAM pools in your virtual environment is insufficient, you can extend the vRAM pools to keep them in compliance with the licensing model of vSphere 5.0 products.

You can extend a vRAM pool of a certain license edition in three ways.

Assign new license keys of the same edition to unlicensed ESXi 5.0 hosts. To increase the vRAM pool for vSphere Standard, you can assign another license key of vSphere Standard to an unlicensed ESXi 5.0 host. In this case, the key adds its vRAM capacity to the vRAM pool for vSphere Standard.

Assign a license key of the same edition and a larger processor capacity to ESXi 5.0 hosts. You can use the VMware License Portal to create a license key with a larger processor capacity by combining the capacities of an already assigned license key and a new key. You can combine the capacities of only license keys that are of the same vSphere 5.0 edition. To extend the vRAM pool for the corresponding license edition, you can remove the old license key from the ESXi 5.x hosts and license them with the key that you created by using the License Portal. For example, suppose that you license a group of ESXi 5.0 hosts with license key A of vSphere Standard. License key A has a capacity of 10 processors and adds 320GB of vRAM to the pool for vSphere Standard. The 365-day moving average for the vRAM usage reaches 320GB. You purchase license key B of vSphere Standard that has a capacity of 5 processors corresponding to a vRAM entitlement of 160GB. You use the VMware Licensing Portal to combine the capacities of license key A and B to create license key C of vSphere Standard that has a capacity of 15 processors. You remove license key A from the ESXi 5.0 hosts and assign them the new license key C. Respectively, the vRAM pool for vSphere Standard is extended to 480GB.

Upgrade the editions of the license keys that are assigned to ESXi 5.0 hosts. For example, you can upgrade the license keys from vSphere Standard to vSphere Enterprise. License keys of vSphere Enterprise entitle 64GB of vRAM.