Depends on the PSU power rating , open it up and look at the sticker on the psu.
A 560ti requires a 500watt PSU
as long as you case are not the slim type the card will fit into your case. what is your spec? also i'm pretty much sure you will need new PSU based on the spec sheet from your link since the unit will come with 300w or 350w psu. GTX560Ti needs 500w PSU (non- generic type)