I have a Gigabyte GA-MA790XT-UD4P motherboard with a Phenom X2 550 Callisto cpu for my backup rig. Been running the basic BIOS with a modest OC to 3.3 for power consumption reasons. Anyway, Today with the mindset of upgrading the cpu to an X6 1055... I updated the BIOS to F8. This went pretty smoothly. Then all these options in the BIOS became available. The EC firmware option on Hybrid basically turned this CPU into an X4 and seems to be running fine. The CPU is identified as B50 on Coretemp. However there are no temp readings!! Now I have a question about all these other options: 1. Advanced Clock Calib - on auto for now - leave it there or modify? What is this supposed to do? 2. CPU core control - On auto; change or not; what does this do? 3. As I am still exploring this BIOS, Any other setting that you guys have found to be good for OCing. The system specs are in my sig. Thanks for the help!!