Will i be able to use dedicated physX?

You have 1 PCI-e 16x slot that i assume your GTX 560 TI is in, there are 2 white PCI slots which are meant for older and lower bandwidth expansion cards like sound cards and TV tuner cards, the little slot is a PCI-e 1x slot which doesn't give much bandwidth so i wouldnt stick something like a 9800 GT in it even for PhysX only.

You shouldn't take too large of a hit with physX on a 560 Ti, give it a shot and see what happens, otherwise your board doesn't really have a good way to support a physX card.