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Core i5-8400 vs i5-9500T


Description
Both models i5-8400 and i5-9500T 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 i5-8400 gets a score of 289.6 k points while the i5-9500T gets 274 k points.

Summarizing, the i5-8400 is 1.1 times faster than the i5-9500T. 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
2.8 GHz
2.2 GHz
Boost frecuency
4 GHz
3.7 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/6
6/6
TDP
65 W
35 W
Cache L1 (d+i)
6x32+6x32 kB
6x32+6x32 kB
Cache L2
6x256 kB
6x256 kB
Cache L3
9216 kB
9216 kB
Date
September 2017
July 2019
Mean monothread perf.
64.98k points
61.46k points
Mean multithread perf.
289.61k points
274.02k 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
i5-9500T
Test#1 (Integers)
4.08k
3.73k (x0.91)
Test#2 (FP)
14.96k
15.41k (x1.03)
Test#3 (Generic, ZIP)
4.98k
4.62k (x0.93)
Test#1 (Memory)
10.29k
10.59k (x1.03)
TOTAL
34.31k
34.35k (x1)

Multithread

i5-8400

i5-9500T
Test#1 (Integers)
21.54k
20.82k (x0.97)
Test#2 (FP)
85.13k
85.48k (x1)
Test#3 (Generic, ZIP)
28.24k
23.21k (x0.82)
Test#1 (Memory)
4.08k
4.11k (x1.01)
TOTAL
139k
133.63k (x0.96)

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
i5-9500T
Test#1 (Integers)
26.5k
24.5k (x0.92)
Test#2 (FP)
23.11k
21.41k (x0.93)
Test#3 (Generic, ZIP)
5.2k
4.82k (x0.93)
Test#1 (Memory)
10.16k
10.73k (x1.06)
TOTAL
64.98k
61.46k (x0.95)

Multithread

i5-8400

i5-9500T
Test#1 (Integers)
135.08k
134.63k (x1)
Test#2 (FP)
121.49k
113.61k (x0.94)
Test#3 (Generic, ZIP)
27.53k
21.71k (x0.79)
Test#1 (Memory)
5.5k
4.07k (x0.74)
TOTAL
289.61k
274.02k (x0.95)

Performance/W
i5-8400
i5-9500T
Test#1 (Integers)
2078 points/W
3846 points/W
Test#2 (FP)
1869 points/W
3246 points/W
Test#3 (Generic, ZIP)
424 points/W
620 points/W
Test#1 (Memory)
85 points/W
116 points/W
TOTAL
4455 points/W
7829 points/W

Performance/GHz
i5-8400
i5-9500T
Test#1 (Integers)
6626 points/GHz
6621 points/GHz
Test#2 (FP)
5778 points/GHz
5786 points/GHz
Test#3 (Generic, ZIP)
1300 points/GHz
1302 points/GHz
Test#1 (Memory)
2541 points/GHz
2901 points/GHz
TOTAL
16245 points/GHz
16610 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