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Сергей



Joined: 26 Aug 2005
Posts: 16920

Flash-Extractor developer

PostPosted: Wed Mar 30, 2016 22:24    Post subject: i5-680 vs i7-4790k
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i5-680
http://ark.intel.com/ru/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz
Cache 4 MB
DMI (internal bus) 2.5 GT/s
2 cores + HT (Hyper-Threading)
Freq 3.6 GHz
Turbo Boost 3.86 GHz
DDR3 1333 (I take memory with latency = 9)
Max Memory Bandwidth 21 GB/s

i7-4790K
http://ark.intel.com/ru/products/80807/Intel-Core-i7-4790K-Processor-8M-Cache-up-to-4_40-GHz
Cache 8 MB
DMI2 (internal bus) 5 GT/s
Cores 4 + HT
Freq 4 GHz
Turbo Boost 4.4 GHz
DDR3-1600 (I take memory with latency = 9)
Max Memory Bandwidth 25,6 GB/s

Test 1 - FE compile time
1 thread, many small files used
i5-680   HT on  - 96 sec 
i5-680 HT off - 91 sec
i7-4790K HT On - 61 sec
i7-4790K HT Off - 60 sec


Test 2 - ECC correction
Used same 16 GB dump
Red with ECC = Check, and green with ECC = ON
Threads number set in FE props before test
i5-680   HT on   Threads 4 -  51 min
i5-680 HT on Threads 3 - 57 min
i5-680 HT on Threads 2 - 71 min
i5-680 HT on Threads 1 - 105 min
 
i5-680 HT off Threads 2 - 62 min
i5-680 HT off Threads 1 - 102 min
 
i7-4790K HT On Threads 8 - 21 min (20:51)
i7-4790K HT On Threads 7 - 21 min (21:26)
i7-4790K HT On Threads 6 - 21 min
i7-4790K HT On Threads 5 - 22 min
i7-4790K HT On Threads 4 - 25 min
i7-4790K HT On Threads 3 - 26 min
i7-4790K HT On Threads 2 - 34 min
i7-4790K HT On Threads 1 - 60 min
 
i7-4790K HT Off Threads 4 - 21 min (21:48)
i7-4790K HT Off Threads 3 - 25 min
i7-4790K HT Off Threads 2 - 34 min
i7-4790K HT Off Threads 1 - 59 min


Results
Test 1: new processor is faster on 1.5 times
Test 2: on 1.78 with single core, and 1.82 with two cores

That is strange because 4.4 GHz / 3.86 GHz = 1,14

May be memory changed from DDR3-1333 to DDR3-1666 with same latance 9 in clock cycles.
9/1333 = 0,00675
9/1666 = 0,00540
0,00675 / 0,00540 = 1,25

We sum 1.14 from freq and 1.25 from memory = 1.14 * 1.25 = 1,425
For Test_1 result is near

What i miss?
Why results for Test_2 is 1.8 faster?
javing



Joined: 22 Sep 2015
Posts: 213


PostPosted: Fri Sep 30, 2016 15:33    Post subject:
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If you can use the GPU just fine.
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