Logainofhades is correct. According to nvidia
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-560/specifications
Thermal and Power Specs:
99 CMaximum GPU Temperature (in C)
150 WMaximum Graphics Card Power (W)
450 WMinimum System Power Requirement (W)
Two 6-pinSupplementary Power Connectors
The 560ti's minimum specs are as follows
Thermal and Power Specs:
Maximum GPU Temperature (in C) 99 C 97 C
Maximum Graphics Card Power (W) 170 W 210 W
Minimum System Power Requirement (W) 500 W 550 W
Supplementary Power Connectors Two 6-pin Two 6-pin