the 560ti needs two 6 pin power connections. you *could* use a molex to 6 pin adapter for the second 6 pin but i would highly recommend NOT doing that with an iball PSU.
unless you have a bag of marshmallows close by so you can roast them once the PSU turns into a flaming brick.
please get another PSU.
but a 7750 would work alright woudnt it ?