File Compression & Encryption:
Website: WinRAR
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DDR2 1,066MHz C5
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G.SKill Pi-Black 4GB 1,015MHz C5
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G.SKill Pi-Black 4GB 800MHz C4
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DDR2 800MHz C5
Time in seconds (lower is better)
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DDR2 1,066MHz C5
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G.SKill Pi-Black 4GB 1,015MHz C5
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G.SKill Pi-Black 4GB 800MHz C4
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DDR2 800MHz C5
Time in seconds (lower is better)
Compression does see a significant performance increase from faster DDR2 memory over low latency, even though the Pi-Blacks at CAS-4 are three seconds faster than DDR2-800 at CAS-5 in large file compression it makes no difference in small file compression. The difference between DDR2-800 and overclocked 1000+MHz (PC2-8000) is significant though at roughly ten seconds and three to six seconds respectively. It's faster for large file compression because there are less interruptions to write to disk.
File Decompression & Decryption
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DDR2 1,066MHz C5
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G.SKill Pi-Black 4GB 1,015MHz C5
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G.SKill Pi-Black 4GB 800MHz C4
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DDR2 800MHz C5
0
3
5.5
8
10.5
13
15.5
18
Time in seconds (lower is better)
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G.SKill Pi-Black 4GB 1,015MHz C5
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G.SKill Pi-Black 4GB 800MHz C4
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DDR2 1,066MHz C5
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DDR2 800MHz C5
Time in seconds (lower is better)
Decompression makes no difference all around apart from a second on average for large file with overclocked 1,015MHz and 1,066MHz memory but it's within experimental error. The bottleneck for decompressing compressed files is clearly overwhemlingly the system and hard drive, rather than the small differences in memory performance.
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