Hello, this might interest you. Undervolted? and overclocked. But I'm only running one core per unit. The most demanding thing I use on my computer, is an old racing simulator that uses predominately one core. It uses a second core lightly and a third core very lightly.
Gigabyte 990FX UD3 R5
Radeon HD7850 2GB
RAM specs in picture below
Cheap 4 heat pipe heat sink with a 120mm fan blowing down on the heat sink and cpu.
These shots of HWiNFO are after one hour of prime95. I let it run another hour while I browsed. The readings were about the same after the second hour.
Vcore set at 1.31875V in BIOS, LLC = Medium. I've seen no problems with any of my ordinary activities.
At 1.3125V, the Vcore in HWiNFO drops to 1.296V when starting prime95, then runs at 1.308V. Around the 1 hour mark it started dropping to 1.296V some and then I got an error on the 3rd core.
I'm getting close to success with lower voltage using Extreme LLC. Extreme raises the Vcore in HWiNFO compared to what I've set in the BIOS. Prime95 runs longer without errors at 1.296V but I'm not "stable" yet. At 1.25625V in the BIOS and 1.296V in HWiNFO I got an error on the 3rd core after 30 minutes. I'll keep going up on the voltage until I find the setting that keeps prime95 running at least an hour. It appears using extreme LLC will allow me a lower idle voltage but at these clocks I doubt I'll get prime95 stable at less than 1.308V in HWiNFO.