What type of water cooling? I have an Opteron 175 with a $100 TT BigWater and it keeps my CPU below 43C at 2420MHz at 1.475volts...
BTW, 55C is safe as well as 60C.
My venice runs at 2800 Mhz (when it decides to be stable lol) and I hit 43C. When I look in my bios for minimum shut down temp on the CPU it lists 60C as the floor and goes up to 75C. So I would suspect you could hit ~60 without any problems. I get nervous when I hit above 45C.... haven't figured out why though lol.