Fx 8150 taking too much voltage

[EdwinCodec]

As the title, My Fx 8150 is taking too much Voltage compare to others. I did a overclocked to 4.4 and stable at 1.3875voltage. Now I'm trying to bump it up to 4.6ghz but it seems to be stable only under 1.45v. Also, my temperature are pretty suck even it's under water cooling. When I running 4.6ghz under prime95, the max temperature written on the hwmonitor is 64Celcius. Which is like no difference if it were to compare with a stock cooler. Any idea?

Specs:
CPU: Fx-8150
RAM: G.Skill 8GB DDR3 1600
Mobo: Crosshair V Formula
Graphics Card: Club3D 7970 Royalking OC
Cooling: XSPC Rasa 750 Rs240 (modded):
i)Pump: Swiftech MCP355
II)Resevoir: XSPC Acrylic Dual 5.25 Reservoir

I would put the settings for 4.6ghz
FSB: 200
Multiplier: 23
Cpu voltage: 1.45v and it goes 1.464v under prime95
Cpu/Nb: 1.25
Dram: 1.5v
HT Link: 2200
Memory: 1600 default
NB: 2400

Any guide =(?

[HiVizMan]

Often that will be the case, there is steady small incremental increase of voltage needed for each increase in frequency, then suddenly there is a huge exponential increase in voltage needed for a new frequency. I would dial back to the frequency and stay at the lower voltage. The gains in performance between the two would be so small I think as to not matter.

[EdwinCodec]

Argh.. How unlucky to get a AMD leakage chip