I was just wondering, can anyone help me locate the Northbridge, Southbridge and graphics chip on my motherboard (ASUS P5N-MX). I assume the northbridge is under the central heatsink. But where is the Southbridge? Surely it's not under the same heatsink.
There's a little chip next to the PCI express slot which could be the video chip, but maybe not?
Almost all of nVidia nForce series chipsets are based on single-chip design (northbridge/southbridge combo).
Asus P5N-MX has nForce 610i which is also based on single-chip design.
So the northbridge you mentioned is also the southbridge; it's on the same chip.
The "video chip" you want to find is already integrated into the northbridge.
More information about nForce 630i/610i can be found here and here.