I have the same chip, except mine is the Y series. I'm overclocking to 1.52. I'm using a Big Moma rad, an older BE Cool water block, and a cheap submerssible pond pump. Everything has 3/8 inch fittings. I'm running a Abit KT7A-Raid. My temps run between 100-104 degrees.
I agree that your temps seem a bit high, though they don't sound dangerous.