"PAE is supported only on 32-bit versions of Windows; 64-bit versions of Windows do not support PAE. The following 32-bit Windows releases support PAE:
- Windows Server 2008
- Windows Vista
- Windows Server 2003
- Windows XP
- Windows 2000 Datacenter Server
- Windows 2000 Advanced Server" PAE@MSDN
"Physical Memory Limits: Windows Vista
The following table specifies the limits on physical memory for Windows Vista.
Version --------------- Limit in 32-bit Windows --- Limit in 64-bit Windows
Windows Vista Ultimate -------- 4 GB ---------------------- 128 GB
Windows Vista Enterprise ------ 4 GB ---------------------- 128 GB
Windows Vista Business -------- 4 GB ---------------------- 128 GB
Windows Vista Home Premium ---- 4 GB ----------------------- 16 GB
Windows Vista Home Basic ------ 4 GB ------------------------ 8 GB
Windows Vista Starter --------- 1 GB ------------------ Not applicable
Physical Memory Limits: Windows XP
The following table specifies the limits on physical memory for Windows XP.
Version --------------- Limit in 32-bit Windows --- Limit in 64-bit Windows
Windows XP -------------------- 4 GB ---------------------- 128 GB
Windows XP Starter Edition -- 512 MB ------------------ Not applicable" Memory Limits for Windows Releases