techPowerUp posted a review on the PowerColor HD 5770 PCS++ 1024M

PowerColor's HD 5770 PCS++ could be described as an evolutionary step from the HD 5770 PCS+, targeted at overclockers. It is the first HD 5770 that comes with a Volterra voltage regulator which allows software voltage control. This enables tweakers to get higher overclocks out of their card without complicated modding.

PowerColor HD 5770 PCS++ 1024M Review