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Core i7-8700k vs i3-9100


Description
Both models i7-8700k and i3-9100 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 i7-8700k gets a score of 443.8 k points while the i3-9100 gets 229.2 k points.

Summarizing, the i7-8700k is 1.9 times faster than the i3-9100. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
906eb
Core
Coffee Lake-S
Coffee Lake-S
Architecture
Base frecuency
3.7 GHz
3.6 GHz
Boost frecuency
4.7 GHz
4.2 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/12
4/4
TDP
95 W
65 W
Cache L1 (d+i)
6x32+6x32 kB
4x32+4x32 kB
Cache L2
6x256 kB
4x256 kB
Cache L3
12288 kB
6144 kB
Date
October 2017
April 2019

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
i7-8700k
i3-9100
Test#1 (Integers)
4127
4299 (4.18%)
Test#2 (FP)
16959
17795 (4.93%)
Test#3 (Generic, ZIP)
5564
5575 (0.20%)
Test#1 (Memory)
12845
8862 (-31.01%)
TOTAL
39495
36531 (-7.51%)

Multithread

i7-8700k

i3-9100
Test#1 (Integers)
24011
15987 (-33.42%)
Test#2 (FP)
108690
66305 (-39.00%)
Test#3 (Generic, ZIP)
36616
20752 (-43.33%)
Test#1 (Memory)
9327
4444 (-52.35%)
TOTAL
178644
107488 (-39.83%)

SSE3 optimized benchmark
The benchmark in mode I (SSE) is optimized for the use of SIMD instructions with 128 bits register and the SSE set up to version 3. Nearly every modern CPU has support for this mode.
Monothread
i7-8700k
i3-9100
Test#1 (Integers)
12920
15531 (20.21%)
Test#2 (FP)
20678
22214 (7.43%)
Test#3 (Generic, ZIP)
5295
5789 (9.32%)
Test#1 (Memory)
12587
8306 (-34.01%)
TOTAL
51480
51840 (0.70%)

Multithread

i7-8700k

i3-9100
Test#1 (Integers)
94259
58565 (-37.87%)
Test#2 (FP)
152549
86170 (-43.51%)
Test#3 (Generic, ZIP)
39735
22401 (-43.62%)
Test#1 (Memory)
8527
4555 (-46.59%)
TOTAL
295071
171690 (-41.81%)

AVX optimized benchmark
The benchmark in mode II (AVX) is optimized to used 256 bits registers beside the first version of the Advanced Vector Extensions (AVX). The first AVX compatible CPU was released in 2011.
Monothread
i7-8700k
i3-9100
Test#1 (Integers)
16874
14810 (-12.23%)
Test#2 (FP)
26119
22150 (-15.20%)
Test#3 (Generic, ZIP)
6329
5415 (-14.43%)
Test#1 (Memory)
13708
4799 (-64.99%)
TOTAL
63030
47173 (-25.16%)

Multithread

i7-8700k

i3-9100
Test#1 (Integers)
105740
52078 (-50.75%)
Test#2 (FP)
180520
87450 (-51.56%)
Test#3 (Generic, ZIP)
44994
20985 (-53.36%)
Test#1 (Memory)
8512
4241 (-50.17%)
TOTAL
339766
164754 (-51.51%)

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
i7-8700k
i3-9100
Test#1 (Integers)
31204
28035 (-10.16%)
Test#2 (FP)
27821
24497 (-11.95%)
Test#3 (Generic, ZIP)
6568
5735 (-12.68%)
Test#1 (Memory)
15004
8476 (-43.51%)
TOTAL
80598
66743 (-17.19%)

Multithread

i7-8700k

i3-9100
Test#1 (Integers)
202422
107496 (-46.90%)
Test#2 (FP)
186332
95109 (-48.96%)
Test#3 (Generic, ZIP)
44958
22022 (-51.02%)
Test#1 (Memory)
10054
4573 (-54.52%)
TOTAL
443765
229199 (-48.35%)

Performance/W
i7-8700k
i3-9100
Test#1 (Integers)
2131 points/W
1654 points/W
Test#2 (FP)
1961 points/W
1463 points/W
Test#3 (Generic, ZIP)
473 points/W
339 points/W
Test#1 (Memory)
106 points/W
70 points/W
TOTAL
4671 points/W
3526 points/W

Performance/GHz
i7-8700k
i3-9100
Test#1 (Integers)
6639 points/GHz
6675 points/GHz
Test#2 (FP)
5919 points/GHz
5833 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1365 points/GHz
Test#1 (Memory)
3192 points/GHz
2018 points/GHz
TOTAL
17148 points/GHz
15891 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. 3.7.9