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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 289.9 k points while the i5-8400 gets 289.6 k points.

Summarizing, the i7-7700K is 1 times faster than the i5-8400. 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
Mean monothread perf.
76.98k points
64.98k points
Mean multithread perf.
289.9k points
289.61k points

Non-optimized benchmark
The benchmark in Mode 0 (FPU) measures cpu performance with non-optimized software. It uses the basic µinstructions from the i386 architecture with the i387 floating point unit. This mode is compatible with all CPUs so it's practical to compare very different CPUs
Monothread
i7-7700K
i5-8400
Test#1 (Integers)
4.63k
4.08k (x0.88)
Test#2 (FP)
18.92k
14.96k (x0.79)
Test#3 (Generic, ZIP)
6.22k
4.98k (x0.8)
Test#1 (Memory)
13.92k
10.29k (x0.74)
TOTAL
43.7k
34.31k (x0.79)

Multithread

i7-7700K

i5-8400
Test#1 (Integers)
18.53k
21.54k (x1.16)
Test#2 (FP)
86.49k
85.13k (x0.98)
Test#3 (Generic, ZIP)
28.78k
28.24k (x0.98)
Test#1 (Memory)
9.67k
4.08k (x0.42)
TOTAL
143.47k
139k (x0.97)

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)
30.47k
26.5k (x0.87)
Test#2 (FP)
26.94k
23.11k (x0.86)
Test#3 (Generic, ZIP)
6.25k
5.2k (x0.83)
Test#1 (Memory)
13.32k
10.16k (x0.76)
TOTAL
76.98k
64.98k (x0.84)

Multithread

i7-7700K

i5-8400
Test#1 (Integers)
127.81k
135.08k (x1.06)
Test#2 (FP)
123.7k
121.49k (x0.98)
Test#3 (Generic, ZIP)
29.34k
27.53k (x0.94)
Test#1 (Memory)
9.05k
5.5k (x0.61)
TOTAL
289.9k
289.61k (x1)

Performance/W
i7-7700K
i5-8400
Test#1 (Integers)
1345 points/W
2078 points/W
Test#2 (FP)
1302 points/W
1869 points/W
Test#3 (Generic, ZIP)
309 points/W
424 points/W
Test#1 (Memory)
95 points/W
85 points/W
TOTAL
3052 points/W
4455 points/W

Performance/GHz
i7-7700K
i5-8400
Test#1 (Integers)
6770 points/GHz
6626 points/GHz
Test#2 (FP)
5987 points/GHz
5778 points/GHz
Test#3 (Generic, ZIP)
1389 points/GHz
1300 points/GHz
Test#1 (Memory)
2960 points/GHz
2541 points/GHz
TOTAL
17106 points/GHz
16245 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. 3.11.4