Out of System PTEs on a Computer w/ More Than 768 MB of Memory

CAUSE

Computers with more than 768 MB of physical memory have fewer available system PTEs than computers with less memory. Increasing the memory capacity of a computer from 512 MB to 1 GB, for example, means you can now run fewer threads. The algorithm for Microsoft Windows NT version 3.51 trades off non-paged pool and system PTE space. Once the sum of these two regions exceeds the allowable space, the number of system PTEs is reduced. On a DEC Alpha computer, this occurs around 768 MB of physical memory.