Windows PE x86 typically requires only 1–2 GB of RAM to run comfortably. The x64 version often consumes over 3 GB just for the base environment. For older systems with 2GB of RAM, the x86 ISO is the only viable option.
The arrival of the versions has bridged that gap, providing a modern, WinPE-based environment for troubleshooting today’s systems. Here is everything you need to know about the updated x86 and x64 builds. What is HBCDPE? hbcdpex86iso updated
Many older tablets (like early Windows 8 tablets) and "Atom" based netbooks use 32-bit UEFI firmware. A standard x64 ISO will not boot on these devices. Windows PE x86 typically requires only 1–2 GB