Yes "Asus 2" is your internal CPU temperature.
Not having a CUBX, I can't tell you exactly. With a P3B-F, I need to dial in +5C "compensation" in MBM 4.18 so that CPU temp is very close to what's reported in Bios. Never having a mainboard that reported internal CPU temp before this one, CPU temp seemed to be very erratic at first. It's normal for it to change for example, from 23C to 22C to 26C to 25C to 23C, every one second. The CPU internal temp can go from 23C to 39C, and vice versa over a two second period.
PC Probe didn't let me compensate the reported CPU temp. It's a nice prog, but I didn't want to constantly add +5C to the reported CPU temp.
Lots of people don't need to compensate their reported temps in MBM. C'est la vie.