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Core i5-8500 vs i5-8400


Description
Both models i5-8500 and i5-8400 are based on Coffee Lake architecture.

Coffee Lake is the second refinement of Intel’s 14nm (Tri-Gate) technology. While it uses LGA1151 socket, it is incompatible with previous generations due to electrical changes in socket’s pins so these CPUs require Z370 chipset. This kind of generation introduced more cores in every range to compete with new AMD’s architecture. Coffee Lake uses DDR4 memory at 2400MHz for i3 and at 2666MHz for i5, i7 CPUs plus iGPU frequency has been increased 50MHz with respect to previous generation.

Using the multithread performance as a reference, the i5-8500 gets a score of 307.5 k points while the i5-8400 gets 289.6 k points.

Summarizing, the i5-8500 is 1.1 times faster than the i5-8400. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
906ea
Core
Coffee Lake-S
Coffee Lake-S
Architecture
Base frecuency
3 GHz
2.8 GHz
Boost frecuency
4.1 GHz
4 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/6
6/6
TDP
65 W
65 W
Cache L1 (d+i)
6x32+6x32 kB
6x32+6x32 kB
Cache L2
6x256 kB
6x256 kB
Cache L3
9216 kB
9216 kB
Date
March 2018
September 2017
Mean monothread perf.
69.09k points
64.98k points
Mean multithread perf.
307.52k 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
i5-8500
i5-8400
Test#1 (Integers)
4.19k
4.08k (x0.97)
Test#2 (FP)
17.38k
14.96k (x0.86)
Test#3 (Generic, ZIP)
5.46k
4.98k (x0.91)
Test#1 (Memory)
11.92k
10.29k (x0.86)
TOTAL
38.96k
34.31k (x0.88)

Multithread

i5-8500

i5-8400
Test#1 (Integers)
27.67k
21.54k (x0.78)
Test#2 (FP)
94.07k
85.13k (x0.9)
Test#3 (Generic, ZIP)
29.05k
28.24k (x0.97)
Test#1 (Memory)
4.39k
4.08k (x0.93)
TOTAL
155.18k
139k (x0.9)

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
i5-8500
i5-8400
Test#1 (Integers)
27.36k
26.5k (x0.97)
Test#2 (FP)
24.27k
23.11k (x0.95)
Test#3 (Generic, ZIP)
5.69k
5.2k (x0.91)
Test#1 (Memory)
11.77k
10.16k (x0.86)
TOTAL
69.09k
64.98k (x0.94)

Multithread

i5-8500

i5-8400
Test#1 (Integers)
144.77k
135.08k (x0.93)
Test#2 (FP)
129.04k
121.49k (x0.94)
Test#3 (Generic, ZIP)
29.53k
27.53k (x0.93)
Test#1 (Memory)
4.18k
5.5k (x1.32)
TOTAL
307.52k
289.61k (x0.94)

Performance/W
i5-8500
i5-8400
Test#1 (Integers)
2227 points/W
2078 points/W
Test#2 (FP)
1985 points/W
1869 points/W
Test#3 (Generic, ZIP)
454 points/W
424 points/W
Test#1 (Memory)
64 points/W
85 points/W
TOTAL
4731 points/W
4455 points/W

Performance/GHz
i5-8500
i5-8400
Test#1 (Integers)
6673 points/GHz
6626 points/GHz
Test#2 (FP)
5920 points/GHz
5778 points/GHz
Test#3 (Generic, ZIP)
1388 points/GHz
1300 points/GHz
Test#1 (Memory)
2870 points/GHz
2541 points/GHz
TOTAL
16850 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