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How CPU Features Affect CPU Performance, Part 7

Intel Core i7, memory subsystem.

February 18, 2010



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Data compression



  DDR3-800 DDR3-1066 DDR3-1333 DDR3-1600
7-Zip ↓ 04:17 04:02 6% 03:47 7% 03:37 5%
WinRAR ↓ 01:21 01:16 7% 01:11 7% 01:07 6%
Group Score ↑ 128 136 6% 145 7% 153 6%

  DDR3-1333
3-ch. 6GB
DDR3-1333
2-ch. 4GB
DDR3-1333
2-ch. 6GB
7-Zip ↓ 03:47 04:31 -16% 04:13 -10%
WinRAR ↓ 01:11 01:25 -16% 01:20 -11%
Group Score ↑ 145 122 -16% 130 -10%

This group of application is traditionally sensitive to everything related to RAM. Today these programs demonstrated high sensitivity to both frequency and the number of channels of the Core i7 memory controller. But then again this is traditional.

Compiling



Another traditionally sensitive test and yet another predictable result. The system equipped with dual-channel DDR3-1333 turned out to be even worse than the one with triple-channel DDR3-800. Simple math (2 x 1333 > 3 x 800) doesn't work here.

Audio encoding



This test is traditionally indifferent. Note that only the 2-channel and 6GB machine lost. Given this is not a measurement error, we see here what we described above: the test seemingly used more than 4GB of RAM and memory access switched to single-channel. This is reasonable, considering that our benchmark creates 8 audio encoding threads on Core i7 simultaneously.

Video encoding



  DDR3-800 DDR3-1066 DDR3-1333 DDR3-1600
Canopus ProCoder ↓ 03:09 03:05 2% 03:05 0% 03:02 2%
DivX ↓ 03:59 03:53 3% 03:48 2% 03:40 4%
Mainconcept VC-1 ↓ 05:36 05:24 4% 05:14 3% 05:08 2%
x264 ↓ 06:22 06:14 2% 06:04 3% 05:57 2%
XviD ↓ 02:30 02:24 4% 02:19 4% 02:17 1%
Group Score ↑ 151 156 3% 160 3% 163 2%

  DDR3-1333
3-ch. 6GB
DDR3-1333
2-ch. 4GB
DDR3-1333
2-ch. 6GB
Canopus ProCoder ↓ 03:05 03:17 -6% 03:20 -8%
DivX ↓ 03:48 03:49 0% 03:48 0%
Mainconcept VC-1 ↓ 05:14 05:29 -5% 05:34 -6%
x264 ↓ 06:04 06:05 0% 06:07 -1%
XviD ↓ 02:19 02:22 -2% 02:25 -4%
Group Score ↑ 160 155 -3% 154 -4%

The effect of memory frequency and the number of channels is rather small.

Java



In this case, performance is affected by memory frequency.


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