Specify the amount of kernel pageable memory available. This memory is used primarily for kernel thread stacks. Increasing this number allows either larger stacks for the same number of threads or more threads. This parameter can only be set on 64–bit kernels. 64-bit kernels use a default stack size of 24 Kbytes.
64–bit kernels, 2 Gbytes
32–bit kernels, 512 Mbytes
64–bit kernels, 512 Mbytes - 24 Gbytes
32-bit kernels, 512 Mbytes
Increase when more threads are desired.