Intel Core i5 and Core i7 Lynnfield review

Written by James Gorbold

September 8, 2009 | 06:36

Tags: #750 #860 #870 #benchmark #core #core-i5 #core-i7 #cpu #i5 #i5-750 #i7 #lga1156 #lynfield #lynnfield #overclocked #performance #processor #review #turbo #turboboost

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.

For Core i7 CPUs we disable SpeedStep, C1E support, Intel C-State technology and Turbo Boost (despite this being a default performance enhancement technology, it can make benchmarks unreliable). We would normally disable HPET too, but the Asus P6T Deluxe doesn't offer this. For Socket AM3 CPUs, we disable Cool'n'Quiet, C1E support and HPET.

However, for the power consumption tests we re-enable in order to get a real-world power draw.

Idle Power Consumption

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

Power Consumption, Idle

Power at wall socket. BIOS Defaults, all onboard hardware enabled. Windows desktop, Aero enabled, Id

  • Intel Core i5-750
  • Intel Core i7-860
  • Intel Core 2 Duo E8600
  • Intel Core i7-870
  • Intel Core 2 Quad Q9650
  • AMD Phenom II X4 955 Black Edition
  • Intel Core 2 Quad Q6600
  • Intel Core i7-920
  • AMD Phenom II X4 965 Black Edition
    • 90
    • 134
    • 91
    • 146
    • 96
    • 116
    • 96
    • 98
    • 97
    • 118
    • 115
    • 171
    • 118
    • 135
    • 130
    • 172
    • 144
    • 182
0
50
100
150
200
Watts (lower is better)
  • Stock Speed
  • Overclocked

Full Load Power Consumption

For this test, we run the small FFT test of Prime95 (v25.9) across all available processing threads and record the wattage drawn from the wall via a power meter.

Power Consumption, Load

Power at wall socket. BIOS Defaults, all onboard hardware enabled. Prime95 Load

  • Intel Core 2 Duo E8600
  • Intel Core i5-750
  • Intel Core 2 Quad Q9650
  • Intel Core 2 Quad Q6600
  • Intel Core i7-860
  • Intel Core i7-870
  • Intel Core i7-920
  • AMD Phenom II X4 955 Black Edition
  • AMD Phenom II X4 965 Black Edition
    • 142
    • 226
    • 170
    • 293
    • 173
    • 299
    • 184
    • 322
    • 185
    • 305
    • 197
    • 270
    • 211
    • 363
    • 217
    • 295
    • 248
    • 330
0
100
200
300
400
Watts (lower is better)
  • Stock Speed
  • Overclocked

For analysis of these results, please read the Results Analysis page.
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