I don't have any of the ASUS Utilities installed

.
- SpeedFan can read the same motherboard sensors that PC Probe does, and it will also display CPU and hard drive sensors.
- I use the BIOS to overclock, so I don't have AI Booster installed.
- As far as I can tell, EPU 6 Engine can't be run if you're doing BIOS overclocking.
- ASUS Update has an unfortunate reputation for causing bad BIOS flashes, so it's usually preferable to use EZFlash2 to update the BIOS
The rest of the apps, I haven't really found a use for. I don't that any of them hamper OCing. I haven't had any personal experience with AI Booster, or similar software overclocking utilities.