The collected works of jocc

Hi!

I have an Intellistation 275. This seems to be a 1-way machine, the documentation says: "The Model 275 can be configured as a 1-way to 2-way symmetric multiprocessing (SMP) system." This means there are systems with single-core and dual-core POWER4+ CPUs ? Or this is just the good old CoD technology and the machines are the same, but in some systems the second core is disabled ? If so, is there a possibility to enable it ?
Another question. I'm running AIX6.1 and Debian Lenny on this machine. In debian the X server crashes, so i have no X. Can you recommend a linux distro that runs fine on this machine ?

Thanks,
Jocc