How low can you go (Vcore voltage)

[amdkt7]

My AMD Athlon 64 X2 5400+ 2.8GHz 2 x 512KB L2 Cache Socket AM2 65W Dual-Core Processor:
http://www.newegg.com/Product/Produc...82E16819103242

It runs quit cool under normal conditions, but under heavy loads the temps push past 60C. I know my cooler needs to have a faster fan on it, but I don't want the noise. I remembered a trick I tried in the past and I have tried it again. I began experimenting with reducing the Vcore voltage and testing with Prime 95 and memtest86 to verify that the system still was stable.
The normal voltage for Vcore is 1.325v for this cpu. I have it set to 1.200v and it still runs stable. Prime95 running on max heat results in temps no higher than 53c now(room temp is about 72F).
I have not tried going any lower with my Vcore. I am already down four steps and I got my temps to where I want them to be. Most of the time I read 25 to 27C, but Prime95 pushes it up to 53C. The spec for the cpu is 68c max. One guy ran his at over 100c when overclocking, but I'm not doing that.
So, how low can you go?

[MaXiMuSiZeMe24]

I got to run my cpu to 5 degrees c with liquid.

[amdkt7]

I actually meant how low can you reduce the cpu core voltage and still be stable. 5c is rather cold temps. How did you cool your liquid?

I reduced the vcore voltage to lower the heat output rather than try to remove the heat after it has been made. Since it runs stable I am happy with my solution.

[KarmaKiller]

Really, you can go as low as you want as long as it's still stable. Maybe run something like Prime95 after you drop the v-core, to test to make sure it's stable.