As the controller's arrival today, I finally was able to power up my pixie (that's how Keysight sales rep pronounces PXI) system.
Currently, there are two 1GHz scopes and 3 SMUs in the box. A DMM module and an auto probe interface module are on their way.
I got really luck on procuring this system. The chassis was bought as "for parts or not working", and the only problem was a dead fan and some conductive dust accumulation. Oh, it came with TCXO upgrade as well.
After dedusting the PCB and replaced the fans, it no longer powers off randomly or complain fan fault anymore.
The controller was also a score. It was listed as used, but it turned out its brand new with only 4 hours of uptime and 40 power cycles. It is in the old painting (white, rather than the new red bars on gray), but for 1/4 the MSRP, I can complain nothing.
The only thing I have with it is the auto low noise fan, which when enabled, triggers the low RPM protection due to my fan has lower RPM than the original one. Since the cooling is actually very well, I decide to trick the system with an RPM doubler. That'd be a quick and fun project that I can also do a PCB designing tutorial on.