不是内存大小问题，就算只有2G也可以安装64位系统（Win8 64位官方要求只是2G）。不过答案是不能！Atom平板的UEFI限制了只能启动32位系统，启动不了64位。另外，Win7的内存占用绝对不比Win8少！
附上Win8.1部分系统要求，引用来源
http://windows.microsoft.com/en-US/windows-8/system-requirements System requirements
Windows 8.1
If you want to run Windows 8.1 on your PC, here's what it takes:
Processor: 1 gigahertz (GHz) or faster with support for PAE, NX, and SSE2 (more info)
RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
Hard disk space: 16 GB (32-bit) or 20 GB (64-bit)
Graphics card: Microsoft DirectX 9 graphics device with WDDM driver