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How CPU Features Affect CPU Performance, Part 5

Intel Core i7, number of cores.

November 23, 2009



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Data compression

Without Turbo Boost and Hyper-Threading





  1 core 2 cores 3 cores 4 cores
7-Zip ↓ 05:01 03:49 31% 03:48 0% 03:45 1%
WinRAR ↓ 01:42 01:17 32% 01:19 -3% 01:19 0%
Group Score ↑ 105 139 32% 138 -1% 138 0%

That's a traditional strange negative response to three cores, which is absent in Phenom II X4.

With Turbo Boost and Hyper-Threading





  2 cores 4 cores 6 cores 8 cores
7-Zip ↓ 04:16 03:46 13% 03:55 -4% 03:37 8%
WinRAR ↓ 01:29 01:13 22% 01:19 -8% 01:07 18%
Group Score ↑ 122 144 18% 135 -6% 153 13%

Response to three cores got only stronger, but there appeared a difference between 7-Zip and WinRAR, practically unnoticeable with disabled TB and HT.

Compared to AMD Phenom II X4



A standard situation. Phenom II X4 leads in scalability.


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