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Core i5-8400 vs i7-8550U


Description
The i5-8400 is based on Coffee Lake architecture while the i7-8550U is based on Kaby Lake.

Using the multithread performance as a reference, the i5-8400 gets a score of 289.6 k points while the i7-8550U gets 166.1 k points.

Summarizing, the i5-8400 is 1.7 times faster than the i7-8550U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
806ea
Core
Coffee Lake-S
Kaby Lake-R
Architecture
Base frecuency
2.8 GHz
1.8 GHz
Boost frecuency
4 GHz
4 GHz
Socket
LGA 1151
BGA1356
Cores/Threads
6/6
4/8
TDP
65 W
15 W
Cache L1 (d+i)
6x32+6x32 kB
4x32+4x32 kB
Cache L2
6x256 kB
4x256 kB
Cache L3
9216 kB
8192 kB
Date
September 2017
August 2017
Mean monothread perf.
64.98k points
64.2k points
Mean multithread perf.
289.61k points
166.12k 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
i5-8400
i7-8550U
Test#1 (Integers)
4.08k
3.91k (x0.96)
Test#2 (FP)
14.96k
15.98k (x1.07)
Test#3 (Generic, ZIP)
4.98k
5.11k (x1.03)
Test#1 (Memory)
10.29k
11.05k (x1.07)
TOTAL
34.31k
36.05k (x1.05)

Multithread

i5-8400

i7-8550U
Test#1 (Integers)
21.54k
11.76k (x0.55)
Test#2 (FP)
85.13k
50.15k (x0.59)
Test#3 (Generic, ZIP)
28.24k
16.76k (x0.59)
Test#1 (Memory)
4.08k
4.17k (x1.02)
TOTAL
139k
82.84k (x0.6)

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
i5-8400
i7-8550U
Test#1 (Integers)
26.5k
25.37k (x0.96)
Test#2 (FP)
23.11k
22.6k (x0.98)
Test#3 (Generic, ZIP)
5.2k
5.13k (x0.99)
Test#1 (Memory)
10.16k
11.1k (x1.09)
TOTAL
64.98k
64.2k (x0.99)

Multithread

i5-8400

i7-8550U
Test#1 (Integers)
135.08k
72.82k (x0.54)
Test#2 (FP)
121.49k
71.71k (x0.59)
Test#3 (Generic, ZIP)
27.53k
17.35k (x0.63)
Test#1 (Memory)
5.5k
4.24k (x0.77)
TOTAL
289.61k
166.12k (x0.57)

Performance/W
i5-8400
i7-8550U
Test#1 (Integers)
2078 points/W
4855 points/W
Test#2 (FP)
1869 points/W
4781 points/W
Test#3 (Generic, ZIP)
424 points/W
1157 points/W
Test#1 (Memory)
85 points/W
282 points/W
TOTAL
4455 points/W
11075 points/W

Performance/GHz
i5-8400
i7-8550U
Test#1 (Integers)
6626 points/GHz
6343 points/GHz
Test#2 (FP)
5778 points/GHz
5650 points/GHz
Test#3 (Generic, ZIP)
1300 points/GHz
1282 points/GHz
Test#1 (Memory)
2541 points/GHz
2774 points/GHz
TOTAL
16245 points/GHz
16049 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