The Microstar BXMaster is also a holder of the AnandTech Editor's Choice award
1. It has an UltraDMA/66 controller just like the cubx
2. will support 768mb of ram, supports 1gb ram on BX if registered Dims, supports ECC
3. Supports up to 155mhz Bus
4. 1.3V - 3.5V vcore in .5 increments.
5. All PCI slots support being Masters "BXMaster features a PCI arbiter chip that allows all 6 of those PCI slots to support bus master devices. PCI slots 1 and 6 still share an IRQ, as do slots 3 and 5. Slot 4 shares an IRQ with the onboard USB controller. "The AGP slot can share an IRQ with either the first or the second PCI slots
6. In many review you can see the BX Master is faster than other BX boards.
7. It is a Top Tier BX board. And beat Cubx in benchmarks.
8. They are Rare, much rarer than Asus cubx or other top tier boards.
9. That particular board was recapped, saving me time and money.
10. It Supports Northbridge Core voltage, and had a rare optional Thermal Sensor for it.
11. The Seller Recapped the board, which is a plus.
Sources.
https://www.anandtech.com/show/556/14