Comparison to the Intel® 440BX AGPset
The Intel 440ZX AGPset is a full featured 440BX AGPset with the following exceptions:

Support for a maximum of two DIMM sockets (256MB memory)
Maximum of four PCI slots
No dual processor support
No ECC support
No Mobile support
No Registered DIMM support
http://support.intel.com/support/chipsets/440ZX/