Asus P8P67 WS Revolution
Xigmatek Gaia sd1283
My question is: how can I lower the voltage? I don't know if I want to run over 1.4 V 24/7.
Are you planning on running your system maxed out 24/7? If not, then setting Vcore a little bit over 1.4 won't hurt. 90% of the time Vcore will be much lower than that as long as you have the turbo function enabled.
The other way to lower Vcore and have a stable system is to lower the multiplier on the CPU so that less voltage is required.