Further info:
# inteltool
Intel CPU: Family 6, Model f Intel Northbridge: 8086:2a00 (PM965) Intel Southbridge: 8086:2815 (ICH8-M)
# dmidecode
# dmidecode 2.9 SMBIOS 2.4 present. 45 structures occupying 1977 bytes. Table at 0x000F7190.
inetltool recognizes Northbridge as PM965 but lspci says GM965. I am not sure which one it is.
I am not sure if is helpful, but the data sheet for Intel 965 Express Chipset Family can be found at: http://www.intel.com/design/chipsets/datashts/313053.htm
If you need any more information about my system, please let me know.