Memory Limits for the Windows OS

Memory Limits for the various versions of Windows 8.1:

• Windows 8.1 RT – 4GB
• Windows 8.1  - 128GB
• Windows 8.1 Pro – 512GB
• Windows 8.1 Enterprise – 512GB
• All 32 bit versions of Windows 8.1 – 4GB 

Memory Limits for the various versions of Windows 8:

• Windows 8 – 128GB
• Windows 8 Pro -512 GB
• Windows 8 Enterprise – 512GB
• All 32 but versions of Windows 8 – 4GB

Memory Limits for the various versions of Windows 7:

• Windows 7 Starter Edition – 2GB (Note: there is no 64 bit version of Win 7 Starter Edition)
• Windows 7 Home Basic – 8GB
• Windows 7 Home Premium – 16GB
• Windows 7 Pro – 192GB
• Windows 7 Enterprise – 192GB
• Windows 7 Ultimate – 192GB
• All 32 bit version of Windows 7 Except Win 7 Starter Edition – 4GB

Memory Limits for the various versions of Windows Vista:

• Windows Vista Starter Edition - 1GB (Note: there is no 64 bit version of Win Vista Starter Edition)
• Windows Vista Home Basic – 8GB
• Windows Vista Home Premium – 16GB
• Windows Vista Business – 128GB
• Windows Vista Enterprise – 128GB
• Windows Vista Ultimate – 128GB
• All 32 bit version of Windows Vista Except Win Vista Starter Edition – 4GB

Memory Limits for the various versions of Windows XP:

• Windows XP Starter Edition - 512MB (Note: there is no 64 bit version of Win XP Starter Edition)
• All 32 bit versions of Windows XP (except Win XP Starter): 4GB
• All 64 bit versions of Windows XP: 128GB

Note: Although each version of Windows has its own limit on the amount of RAM it will support, so do the many CPU/motherboard combinations found in PCs both old and new. Therefore, just because your particular Windows version supports a certain amount of RAM, your computer’s CPU/motherboard might support more or less than that amount.