Isso acontece por causa do novo despejo configuração" Automatic dump "no Windows 8 .
The “System Managed” page file has been updated to reduce the page file size on disk, primarily for small SSDs but will also benefit servers with large amounts or ram.
The “Automatic memory dump” is not really a new memory dump type. In previous versions of Windows, we already have Mini, Kernel, and Complete memory dump options. The Automatic memory dump option produces a Kernel memory dump, the difference is when you select Automatic it allows the SMSS process to reduce the page file smaller than the size of RAM.