450GX & 450KX are the first chipsets intended for the i686 era of processors. Mostly they were used on workstations and servers but also a few general boards. This is an early implementation, not complete due to 86Box limitations in terms of memory handling.
A replacement for the US Technologies 386. It's a late 386SX board released around 1996. Comes with parts commonly found on late 486 and mid Pentium systems.
Popular chipset casually used on the PC Chips motherboards rebranded as TXPro. The implementation is extremely early with many bugs surrounding both machines it comes with.