Other posters to these forums suggest that Windows XP guests max out at ~3.6GB. If you have a gaming system with a large video card, then Windows would give you much less than 3.75GB. This would make sense if Windows 7 32-bit could only support 3072mb of RAM, but in this article Mark Russinovich says that a Windows 32-bit client can use up to 3.75GB of memory depending on the hardware. It says that this 1024mb "is not wasted" because "the VMM does not need to allocate the memory that the guest cannot access".
This Vmware KB says that a hardware version 7 guest offers 3072mb supported memory, and 1024mb reserved memory. I can never get taskmgr.exe to report more than 3071mb total physical memory for a Windows 7 32-bit guest. Because of overhead and memory holes, I would expect the number to be less than 4GB, perhaps 3.5GB, but in reality it seems to only be 3GB.
It's unclear to me the maximum memory you should allocate for a Windows 7 32-bit guest.
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