I can't find any real reviews of that power supply. Thermaltake has a pretty bad reputation when it comes to power supplies though. That unit is discontinued and was made by FSP.http://www.realhardtechx.com/index_archivos/Page680.htm
The GTX 560 Ti 448 pulls about 265w at maximum but much less on average.http://www.techpowerup.com/reviews/ASUS/GTX_560_Ti_448_Cores_DirectCU_II/25.html
I would say as long as you don't overclock you are probably OK. But if it was my computer I would replace it when you can afford it with something decent.
Corsair, Seasonic, PC Power and Cooling, XFX, Silverstone, Enermax, OCZ and Antec are what you should look at. 500-550 watts should be fine with one card and 700-750 watts if you plan on adding a second one in Sli.
CPU will not bottleneck that card at all.