iXBT Labs - How CPU Features Affect CPU Performance, Part 7 - Page 3: Compression, compiling, encoding, Java

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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