Software

Most graphics card manufacturers now have their own custom OC and monitoring utilty, and Gigabyte's is OC Guru. Power Target for GPU Boost is limited to 115% on this board. Core voltage, which is currently done through a driver interface rather than i2c hardware control, cannot be adjusted by software means either.

ocguru Nvidia GeForce GTX 660 Ti Review (Part 1/3)   Gigabytes Windforce OC Edition

 

Overclocking

maxoc Nvidia GeForce GTX 660 Ti Review (Part 1/3)   Gigabytes Windforce OC Edition

  Reference GTX 660Ti Gigabyte Windforce 660Ti Gigabyte Windforce 660Ti with OC
Core Clock 915 MHz 1033 MHz (+13%) 1083 MHz (+5%)
Boost Clock 980 MHz 1111 MHz  (+13%) 1161 MHz  (+5%)
Memory Clock 1502 MHz 1502 MHz 1752 MHz (+17%)

As with any overclocking, your mileage will vary.

 

Thermals

 

Stock Clocks/Voltages with 100% Fan (Max 60 degrees celcius)

stock Nvidia GeForce GTX 660 Ti Review (Part 1/3)   Gigabytes Windforce OC Edition

 

Overclocked / Raised Power Limits with 100% Fan (Max 66 degrees celcius)

oc Nvidia GeForce GTX 660 Ti Review (Part 1/3)   Gigabytes Windforce OC Edition