Hi, the first gen axon server's do not have the same updated DL3 content as the newest versions,some of the grapics card's are also discontinued which also makes finding spares very diffcult.Really depends what you need the server for if it is going to a big difference.
Here's a link to the secret hardware decoder ring to see what hardware was in each Axon rev: www.highend.com/support/digital_lighting/DigitalLightingServerHardware.asp
Keep in mind a number of older units out there have been updated with newer hardware, so this doesn't guarantee that a unit with that serial prefix has that specific hardware in it, but it will tell you what hardware that unit was originally shipped with.