PC Perspective posted a review on the Corsair TX750W Power Supply

Overall, most of the higher-capacity Channel Well Technology built power supplies have proven to be excellent but they have a weakness, which is higher levels of AC ripple on the +12V output. While still well within spec, the TX750W exhibits a little more AC ripple on the +12V rail than we would like to see, especially at higher loads. Bottom line; you get what you pay for and some trade-offs have to be made when balancing price and performance.

Corsair TX750W Power Supply Review