Intel Core i7-5930K and Core i7-5820K Review

Written by Antony Leather

September 3, 2014 | 12:09

Tags: #haswell-e #haswell-e-review #intel-core-i7-5820k-review #intel-core-i7-5930k-review #intel-core-i7-5960x-review #lga2011-v3 #x99 #x99-review

Companies: #intel

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 also 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 are of 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 acheive.

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. We've also added two additional tests that show the absolute default setting power consumption with the Core i7-5930K and Core i7-5820K, which can only be currently achieved using 2,133MHz memory. All other tests were carried out using 2,666MHz memory, but due to limitations with the X99 chipset, the CPU strap is forced to 125MHz with a resulting increase in power consumption on many motherboards.

Power Consumption (Idle)

Windows Aero enabled

  • ntel Core i7-5930K (3.5GHz, 2,133MHz RAM)
  • ntel Core i7-5820K (3.3GHz, 2,133MHz RAM)
  • Intel Core i7-4770K (3.5GHz/4.7GHz)
  • Intel Core i7-4790K (4GHz/4.8GHz)
  • AMD FX-8350 (4GHz/4.8GHz)
  • Intel Core i7-4930K (3.4GHz/4.5GHz)
  • Intel Core i7-5820K (3.3GHz/4.3GHz)
  • ntel Core i7-5930K (3.5GHz/4.55GHz)
  • Intel Core i7-5960X (3GHz/4.45GHz)
  • Intel Core i7-3960X Extreme Edition (3.3GHz/4.7GHz)
    • 74
    • 0
    • 75
    • 0
    • 81
    • 100
    • 84
    • 109
    • 91
    • 157
    • 114
    • 126
    • 119
    • 121
    • 125
    • 126
    • 127
    • 139
    • 172
    • 205
0
50
100
150
200
Watts, lower is better
  • Stock Speed
  • Overclocked

Load Power Consumption
For this test, we want to only stress the CPU, so use the smallfft stress test of Prime95 to fully load all available processors (logical as well as physical). We leave Aero enabled, and wait a few minutes for any power saving technology to kick in and for the power consumption to level out before taking our reading.

Power Consumption (Load)

Windows Aero enabled

  • Intel Core i7-4770K (3.5GHz/4.7GHz)
  • Intel Core i7-4790K (4GHz/4.8GHz)
  • Intel Core i7-5930K (3.5GHz/4.55GHz)
  • Intel Core i7-4930K (3.4GHz/4.5GHz)
  • Intel Core i7-5820K (3.3GHz/4.3GHz)
  • Intel Core i7-3960X Extreme Edition (3.3GHz/4.7GHz)
  • Intel Core i7-5960X (3GHz/4.45GHz)
  • AMD FX-8350 (4GHz/4.8GHz)
    • 137
    • 171
    • 154
    • 198
    • 201
    • 352
    • 212
    • 274
    • 216
    • 339
    • 220
    • 436
    • 274
    • 445
    • 283
    • 334
0
100
200
300
400
Watts, lower is better
  • Stock Speed
  • Overclocked

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