Power Consumption

For all of the performance tests, we disable all power-saving technology in order to give us a consistent set of results, and to give us best-case performance numbers - even though technologies such as Intel's SpeedStep might only take microseconds to kick in, that can make a difference in some tests.

However, for the power consumption tests we re-enable everything in order to get a real-world power draw. The power draw is measured via a power meter at the wall, so the numbers below represent the total system power draw from the mains, not the power consumption of a CPU itself. Measuring the power draw of any individual component in a PC is tricky to impossible to achieve.

Idle Power Consumption

For this test, we leave the PC doing nothing but displaying the Windows 7 desktop (with Aero enabled) for a few minutes and record the wattage drawn from the wall via a power meter.

Power Consumption (Idle)

Peak system power draw from the wall, Windows 7 Desktop, with Aero enabled)

  • Intel Core i5-2400 (3.1GHz)
  • Intel Core i5-2500K (3.3GHz)
  • Intel Core i7-2600K (3.4GHz)
  • Intel Core i5-2400 (up to 3.99GHz)
  • Intel Core i3-2100 (3.1GHz)
  • Intel Core i5-2500K (4.9GHz)
  • Intel Core i7-2600K (4.85GHz)
  • Intel Core i5-760 (2.8GHz)
  • AMD Phenom II X6 1100T Black Edition (3.3GHz)
  • Intel Core i7-990X Extreme Edition (3.46GHz)
  • Intel Core i7-950 (3.06GHz)
  • AMD Phenom II X4 980 Black Edition (3.7GHz)
  • Intel Core i5-760 (4.1GHz)
  • Intel Core i7-980X Extreme Edition (3.33GHz)
  • AMD Phenom II X6 1100T Black Edition (4.2GHz)
  • Intel Core i7-990X Extreme Edition (4.6GHz)
  • AMD Phenom II X4 980 Black Edition (4.3GHz)
  • Intel Core i7-950 (4.3GHz)
  • Intel Core i7-980X Extreme Edition (4.4GHz)
  • 75
  • 76
  • 77
  • 77
  • 78
  • 80
  • 81
  • 93
  • 108
  • 109
  • 117
  • 119
  • 124
  • 140
  • 146
  • 157
  • 167
  • 174
  • 177
0
50
100
150
200
Watts, lower is better

Power Consumption (Load)

Peak system power draw from the wall, Prime95 smallfft test

  • Intel Core i3-2100 (3.1GHz)
  • Intel Core i5-2400 (3.1GHz)
  • Intel Core i5-760 (2.8GHz)
  • Intel Core i5-2500K (3.3GHz)
  • Intel Core i5-2400 (up to 3.99GHz)
  • Intel Core i7-2600K (3.4GHz)
  • AMD Phenom II X4 980 Black Edition (3.7GHz)
  • Intel Core i5-760 (4.1GHz)
  • AMD Phenom II X6 1100T Black Edition (3.3GHz)
  • Intel Core i5-2500K (4.9GHz)
  • Intel Core i7-990X Extreme Edition (3.46GHz)
  • Intel Core i7-950 (3.06GHz)
  • Intel Core i7-2600K (4.85GHz)
  • Intel Core i7-980X Extreme Edition (3.33GHz)
  • AMD Phenom II X4 980 Black Edition (4.3GHz)
  • Intel Core i7-990X Extreme Edition (4.6GHz)
  • Intel Core i7-980X Extreme Edition (4.4GHz)
  • AMD Phenom II X6 1100T Black Edition (4.2GHz)
  • Intel Core i7-950 (4.3GHz)
  • 115
  • 142
  • 146
  • 148
  • 154
  • 156
  • 195
  • 198
  • 207
  • 221
  • 231
  • 233
  • 234
  • 256
  • 331
  • 356
  • 368
  • 369
  • 383
0
100
200
300
400
Watts, lower is better

Note: the Intel LGA1156 CPUs were tested in a micro-ATX board. This difference can account for up to 20W, as we found in our Energy Efficient Hardware feature.

Read our Performance Analysis.

QUICK COMMENT

View this in the forums

SUBSCRIBE TO OUR NEWSLETTER

WEEK IN REVIEW

TOP STORIES

SUGGESTED FOR YOU