The bigger brother of the PX5 in ATX form factor is suffering from the same problem as its sibling, it is quite touchy about the SDRAM that's used with it. Unlike the VX chipset predecessor of this board (IT5V) and unlike the TX boards form Shuttle and AOpen, it wouldn't run stable with the Corsair SDRAM I'm using by default. This is not a very serious problem as long as you are using only 66 MHz bus speed, but 75 and 83 MHz will give you a lot of headaches until you find the proper SDRAM to go with it. I succeeded to run this board at these bus speeds with Toshiba SDRAM eventually.
This board is also using the TX chipset, it comes with the usual Abit
Coming with 4 PCI, 4 ISA, 4 SIMM and 3 DIMM slots, it supports all Socket 7 CPUs, including the M2 and the 3.2 V for the K6 233, you can use each type of RAM, cacheable area 64 MB, no ECC support, Ultra-DMA support, switching voltage regulator.
This board is still one of the fastest Socket 7 boards, especially at the usual bus speeds and the latest revision 1.5 supports 75 and 83 MHz as well. This revision is out now. It is a HX chipset board, so it can do ECC if you fancy that. Since revision 1.2 it is now also including a large tag RAM, which enables 512 MB of cacheable area. As all the recent Abit boards it comes with the SoftMenu feature (=jumperless design) and offers you the 'turbo frequency' for 'non-overclockers'.
I recommend this board especially in the latest revision (1.5 and up) to everyone who wants to have a Socket 7 board that supports almost everything except the UltraDMA feature. It's a very good performer, it's extremely convenient due to its jumperless design and it can handle 512 MB RAM as well as 83 MHz bus speed.It's actually one of the fastest boards for a K6 233 under Windows NT. The 83 MHz performance is somewhat lower than of a TX board, due to the missing SDRAM support, since with EDO you have to reduce the RAM timing for 83 MHz.