The latest supported card is the Ragnarok. This is semi-supported but it is currently working and is stable. Specs as tested:

• PowerPC 750FX@800MHz with 512KB L2 on-die cache
• 512MB of SDRAM as of release 402, up to 384MB available depending on PCI space utilized by other devices
• 512MB provided by either 9pcs Samsung K4S510832B-TC75 or Micron 48LC64M8A2-75

As with other PPC PMC boards many different hardware configurations for this board exist but it is unknown whether any of the other variations work.