Should i try it

Yes, you can use a pcie 1.1 gpu in a 2.0 slot, you'll just get 1.1 speeds. I'm not familiar with the gtx 760, but for that price sounds great.

Edit: I had a gtx 750ti, it was a decent card and the 760 does much better than it in benchmarks. I've never heard of the brand that you linked, but the gx 760 would probably play most new games with medium/high settings at playable fps.