http://www.networld.co.jp/vmware/pro_info/vsphere/vram.htm
vSphere 5は各エディション・1ライセンスごとに利用できるvRAM（仮想マシンに割り当てる仮想メモリ量）に制限があります。
制限されるvRAMの使用量は、各エディションごとに異なっています。仮想メモリの1年間の平均使用量が、このvRAM制限を超えないようにご利用下さい。
http://blogs.vmware.com/partner/2011/08/vmware-vsphere-5-licensing-and-pricing-update.html
We’ve adjusted our model to be much more flexible around transient workloads, and short-term spikes that are typical in test & development environments for example. We will now calculate a 12-month average of consumed vRAM to rather than tracking the high water mark of vRAM.
http://www.vmware.com/products/vsphere-hypervisor/faq.html
How much vRAM does a VMware vSphere Hypervisor license provide?
vSphere Hypervisor license provides a vRAM entitlement of 32GB per server, regardless of the number of physical processors. vSphere Hypervisor can be used on servers with maximum physical RAM capacity of 32GB.
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