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Core i7-7700K vs i5-8400


Description
The i7-7700K is based on Kaby Lake architecture while the i5-8400 is based on Coffee Lake.

Using the multithread performance as a reference, the i7-7700K gets a score of 291.1 k points while the i5-8400 gets 317.3 k points.

Summarizing, the i5-8400 is 1.1 times faster than the i7-7700K . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906e9
906ea
Core
Kaby Lake-S
Coffee Lake-S
Architecture
Base frecuency
4.2 GHz
2.8 GHz
Boost frecuency
4.5 GHz
4 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
4/8
6/6
TDP
95 W
65 W
Cache L1 (d+i)
32+32 kB
6x32+6x32 kB
Cache L2
256 kB
6x256 kB
Cache L3
8192 kB
9216 kB
Date
September 2016
September 2017

AVX2 optimized benchmark
The benchmark in mode III (AVX2), like AVX1, is optimized to used 256 bits registers beside the second version of the Advanced Vector Extensions (AVX). The first AVX2 compatible CPU was released in 2013.
Monothread
i7-7700K
i5-8400
Test#1 (Integers)
30864
26118 (-15.38%)
Test#2 (FP)
27262
23191 (-14.93%)
Test#3 (Generic, ZIP)
6421
5403 (-15.85%)
Test#1 (Memory)
13994
11161 (-20.24%)
TOTAL
78541
65873 (-16.13%)

Multithread

i7-7700K

i5-8400
Test#1 (Integers)
129531
146011 (12.72%)
Test#2 (FP)
122200
133114 (8.93%)
Test#3 (Generic, ZIP)
29617
30374 (2.56%)
Test#1 (Memory)
9751
7828 (-19.72%)
TOTAL
291099
317328 (9.01%)

Performance/W
i7-7700K
i5-8400
Test#1 (Integers)
1363 points/W
2246 points/W
Test#2 (FP)
1286 points/W
2048 points/W
Test#3 (Generic, ZIP)
312 points/W
467 points/W
Test#1 (Memory)
103 points/W
120 points/W
TOTAL
3064 points/W
4882 points/W

Performance/GHz
i7-7700K
i5-8400
Test#1 (Integers)
6859 points/GHz
6529 points/GHz
Test#2 (FP)
6058 points/GHz
5798 points/GHz
Test#3 (Generic, ZIP)
1427 points/GHz
1351 points/GHz
Test#1 (Memory)
3110 points/GHz
2790 points/GHz
TOTAL
17453 points/GHz
16468 points/GHz

Monothread performance graph
Monothread performance graphics gives the performance vs time. They are useful to measure the time it takes to the CPU to reach the maximum performance.

Usually, CPU's performance will be steady during these tests but if it has a slow frequency strategy, the first samples will show a lower score.


Test#1 (Integers) [points vs time]

grafica bm.hardlimit.com


Test#2 (FP) [points vs time]

grafica bm.hardlimit.com


Test#3 (Generic, ZIP) [points vs time]

grafica bm.hardlimit.com


Test#1 (Memory) [points vs time]

grafica bm.hardlimit.com

Multithread performance graph
Multithread graphs measure the performance against a heavy load during certain time.

If CPU's TDP doesn't limit the frequency and the machine is properly cooled, performance should remain steady vs time. Otherwise, the performance score will oscillate or decrease over time.


Test#1 (Integers) [points vs time]

grafica bm.hardlimit.com


Test#2 (FP) [points vs time]

grafica bm.hardlimit.com


Test#3 (Generic, ZIP) [points vs time]

grafica bm.hardlimit.com


Test#1 (Memory) [points vs time]

grafica bm.hardlimit.com

Hardlimit Benchmark Central - Ver. 3.7.9