Our electricity bill went from 1.6k to 1.3k downgrading from an FX-6300 heavily overclocked + HD7950 overclocked to an A8-5600k slightly overclocked + onboard graphics. Sacrificed 80% gaming performance to save 300 pesos. Is it worth it? Hell no. Power consumption is overrated.
Note: With the previous rig, I'm averaging around 6-8 hours playing time per day. With current rig I'm cut down to 3 sessions of NBA 2k14. The rest of hours goes to surfing and watching movies, around 10-12 hours of usage.