Swapping VMs --> more memory assigned then recommended

In ESX cluster with 3 host I have some WIndows 2003 Server Standard x64 machines with 16GB RAM.
 In VM Settings "Windows 2003 Server x64 Standard" is selected. The recommended max RAM size by VMware is 4GB according to the menu when creating the machine. I assigned 16GB to my machines, because the OS I installed supports up to 32GB. Now the VM are performing very slow, time to boot ist up to 10 minutes. The VMs are creating heavy CPU Load on the Host when booting.

I changed the OS selection to "Windows 2003 Server x64 Enterprise". Now everything is fine.

What causes this behavior? Can it possibly be that ESX is only assigning the recommended RAM as physical RAM to the VM and the rest is swapped to the disk?
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TRITEC-kuenAsked:
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bmonroe44Connect With a Mentor Commented:
Even though you selected a x64 base operating system that is capable of handling 32gb of memory there are specific limitations on the template guest selected. Anytime you are using more than 4gb of memory on any system (x86 or x64) be sure to always select the enterprise template as it is the most compatible with the larger amounts of memory. This is the same issue with XenServer and why they adjust RAM shadowing which increases performance on guest vm's that operate as terminal servers. Consequently, operating system types are strictly enforced in both environment.
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TRITEC-kuenAuthor Commented:
Nobody knows something on this?
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