Virtual server limitations of Windows Server 2008 Standard x64

I ordered an 8 processor, 32gig RAM server from Dell today and the pre-
sales rep told me that Win2K8 x64 Standard was limited to having 4gig
of memory per VM with standard and that to go above 4 gig I'd need the
Enterprise version of Win2K8.  I hadn't heard this before, is he
correct?

Thanks!