Core i5-8400 vs i7-8665U
Description
The i5-8400 is based on Coffee Lake architecture while the i7-8665U is based on Whiskey Lake.
Using the multithread performance as a reference, the i5-8400 gets a score of 289.6 k points while the i7-8665U gets 123.1 k points.
Summarizing, the i5-8400 is 2.4 times faster than the i7-8665U. To get a proper comparison between both models, take a look to the data shown below.
Using the multithread performance as a reference, the i5-8400 gets a score of 289.6 k points while the i7-8665U gets 123.1 k points.
Summarizing, the i5-8400 is 2.4 times faster than the i7-8665U. To get a proper comparison between both models, take a look to the data shown below.
Specs
CPUID
906ea
806ec
Core
Coffee Lake-S
Whiskey Lake-U
Base frecuency
2.8 GHz
1.9 GHz
Boost frecuency
4 GHz
4.8 GHz
Socket
LGA 1151
BGA 1528
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
April 2019
Mean monothread perf.
64.98k points
41.66k points
Mean multithread perf.
289.61k points
123.09k points
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
i7-8665U
Test#1 (Integers)
26.5k
16.92k (x0.64)
Test#2 (FP)
23.11k
15.41k (x0.67)
Test#3 (Generic, ZIP)
5.2k
3.33k (x0.64)
Test#1 (Memory)
10.16k
6k (x0.59)
TOTAL
64.98k
41.66k (x0.64)
Multithread
i5-8400
i7-8665U
Test#1 (Integers)
135.08k
53.19k (x0.39)
Test#2 (FP)
121.49k
52.4k (x0.43)
Test#3 (Generic, ZIP)
27.53k
11.67k (x0.42)
Test#1 (Memory)
5.5k
5.83k (x1.06)
TOTAL
289.61k
123.09k (x0.43)
Performance/W
i5-8400
i7-8665U
Test#1 (Integers)
2078 points/W
3546 points/W
Test#2 (FP)
1869 points/W
3493 points/W
Test#3 (Generic, ZIP)
424 points/W
778 points/W
Test#1 (Memory)
85 points/W
389 points/W
TOTAL
4455 points/W
8206 points/W
Performance/GHz
i5-8400
i7-8665U
Test#1 (Integers)
6626 points/GHz
3525 points/GHz
Test#2 (FP)
5778 points/GHz
3210 points/GHz
Test#3 (Generic, ZIP)
1300 points/GHz
694 points/GHz
Test#1 (Memory)
2541 points/GHz
1251 points/GHz
TOTAL
16245 points/GHz
8680 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.
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]
Test#2 (FP) [points vs time]
Test#3 (Generic, ZIP) [points vs time]
Test#1 (Memory) [points vs time]
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.
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]
Test#2 (FP) [points vs time]
Test#3 (Generic, ZIP) [points vs time]
Test#1 (Memory) [points vs time]
Hardlimit Benchmark Central - Ver. 3.11.4