I have several Neo's in my junk draw.....and 520 is a lil tight considering that 500W is the minimum size PSU and you are OC'ing ithttp://www.geforce.com/Hardware/GPUs/geforce-gtx-560ti/specificationsThermal 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
At 4 months, it's still under warranty .... give em a call.