RE: configuracion Shared Buffer

Hola lista
Quiero molestarlos de nuevo adquirimos un servidor MAC G4 OS X 10 con 2 procesadores y 4GB de memoria Ram, instale Postgresql 8.2 pero me da el siguiente error

FATAL: could not create shared memory segment: Invalid argument
DETAIL: Failed system call was shmget(key=5432001, size=484491264, 03600).
HINT: This error usually means that PostgreSQL's request for a shared memory segment exceeded your kernel's SHMMAX parameter. You can either reduce the request size or reconfigure the kernel with larger SHMMAX. To reduce the request size (currently 484491264 bytes), reduce PostgreSQL's shared_buffers parameter (currently 56800) and/or its max_connections parameter (currently 500).
If the request size is already small, it's possible that it is less than your kernel's SHMMIN parameter, in which case raising the request size or reconfiguring SHMMIN is called for.
The PostgreSQL documentation contains more information about shared memory configuration.

Estuve viendo en la documentación como aumentar o reducir las pociones SHMMAX y SHMMIN pero me da el mismo error y me gustaria que me recomendaran alguna configuración.
Y mi intension es que pueda configurar el max_connection a 1000 porque con 500 mi aplicación me da un error que dice
Too many client exist..

Agradeciendoles de antemano
Douglas Escobar