For a system using a single NVIDIA reference design GeForce GTX 660 Ti graphics card NVIDIA specifies a minimum of a 450 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 24 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.
Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most important factor.
Overclocking of the CPU and/or factory or manual overclocking of the GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.
The Corsair Builder Series CX430 (SKU# CP-9020046), with its maximum combined +12 Volt continuous current rating of 32 Amps and with one (6+2)-pin PCI Express supplementary power connector, is electrically sufficient to power your system configuration with a single GeForce GTX 660 Ti graphics card but is deficient by one PCI Express supplementary power connector so you'll have to resort to using a dual 4-pin Molex peripheral to 6-pin PCIe adapter cable that MSI includes with their graphics cards.