That CPU card looks like a 604, so I'd say it'd most likely be a 7300 or 7600. Its definitely not a 4400 - this is a 4400:



(I know it says 7220 - the photo was taken by our very own Danamania, the 4400 was sold as the 7220 here)

Either way - its definitely no 4400 - the 4400 was based on a Tanzania board, which not only won't fit in an Outrigger case, but also has a soldered-on CPU. (G3 upgrades were available via the L2 cache slot)