|Intel Sandy Bridge Overclocking Guide|
|Articles - Featured Guides|
|Written by Servando Silva|
|Tuesday, 19 April 2011|
Page 8 of 10
Overclock vs. Power ConsumptionSome people cry a lot about power consumption (including me). I'm the kind of person who wants the best efficiency if possible, and that means I want my CPU as fast as I can without doubling power consumption. As if we didn't have enough with all the extra components already! Reality is, many people don't even bother about power consumption, and after all, that's why they paid for an 800 watt PSU (even if they normally don't use more than 300 watts). Anyway, I'll test both Idle and Prime 95 modes and measure CPU power consumption with Real Temp 3.67. Have a look at the next results as they represent power consumption in idle mode. These numbers are important as you probably keep your PC near idle mode 70% (or more) of your time.
Woah! Those processors barely use 6 watts at idle mode. This is with EIST and Turbo Boost enabled. When overclocked, it seems the CPU power consumption raised somewhere between 10 and 11 watts, but still, seems like a very nice result. Anyway, we can only make conclusions after analyzing Full Load results, but I hope they won't increase that much. Let's have a look at the next chart:
OK now we're talking. The Core i7 2600K consumes 10 extra watts against the Core i5 2500K at full load. When overclocked to 4GHz, the i5 increased 16 watts while the i7 increased 17 watts. The next step was overclocking both CPUs at 4.4GHz which according to the voltage it needs; it seems like the sweet point for Sandy Bridge overclocking. The Core i5 increased its power consumption to 82 watts, which is 23 extra watts against stock values, while the i7 increased to 94 watts, nearly arriving to the TDP.
Finally at 4.8GHz the Core i5 consumes 90 watts, which is 50% extra consumption, while the Core i7 2600K reaches 105 watts, representing a 50% extra power consumption also. Of course, increasing power consumption means the CPU heatsink will have more watts to dissipate, thus increasing CPU temperatures. Let's have a look at our voltage vs. temperature results in the next page then.