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Core i7-8700k vs i3-7100


Description
The i7-8700k is based on Coffee Lake architecture while the i3-7100 is based on Kaby Lake.

Using the multithread performance as a reference, the i7-8700k gets a score of 443.8 k points while the i3-7100 gets 126.5 k points.

Summarizing, the i7-8700k is 3.5 times faster than the i3-7100. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
906e9
Core
Coffee Lake-S
Kaby Lake-S
Architecture
Base frecuency
3.7 GHz
3.9 GHz
Boost frecuency
4.7 GHz
3.9 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/12
2/4
TDP
95 W
51 W
Cache L1 (d+i)
6x32+6x32 kB
2x32+2x32 kB
Cache L2
6x256 kB
2x256 kB
Cache L3
12288 kB
3072 kB
Date
October 2017
January 2017

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
i3-7100
Test#1 (Integers)
4127
4010 (-2.83%)
Test#2 (FP)
16959
16382 (-3.40%)
Test#3 (Generic, ZIP)
5564
5310 (-4.57%)
Test#1 (Memory)
12845
3984 (-68.99%)
TOTAL
39495
29686 (-24.84%)

Multithread

i7-8700k

i3-7100
Test#1 (Integers)
24011
8097 (-66.28%)
Test#2 (FP)
108690
38702 (-64.39%)
Test#3 (Generic, ZIP)
36616
12689 (-65.35%)
Test#1 (Memory)
9327
3755 (-59.74%)
TOTAL
178644
63243 (-64.60%)

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
i3-7100
Test#1 (Integers)
12920
14043 (8.69%)
Test#2 (FP)
20678
20546 (-0.64%)
Test#3 (Generic, ZIP)
5295
5405 (2.08%)
Test#1 (Memory)
12587
3995 (-68.26%)
TOTAL
51480
43989 (-14.55%)

Multithread

i7-8700k

i3-7100
Test#1 (Integers)
94259
30090 (-68.08%)
Test#2 (FP)
152549
47844 (-68.64%)
Test#3 (Generic, ZIP)
39735
13134 (-66.95%)
Test#1 (Memory)
8527
3519 (-58.74%)
TOTAL
295071
94586 (-67.94%)

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
i3-7100
Test#1 (Integers)
16874
14411 (-14.59%)
Test#2 (FP)
26119
22381 (-14.31%)
Test#3 (Generic, ZIP)
6329
5454 (-13.82%)
Test#1 (Memory)
13708
4964 (-63.79%)
TOTAL
63030
47210 (-25.10%)

Multithread

i7-8700k

i3-7100
Test#1 (Integers)
105740
30484 (-71.17%)
Test#2 (FP)
180520
52082 (-71.15%)
Test#3 (Generic, ZIP)
44994
12972 (-71.17%)
Test#1 (Memory)
8512
4563 (-46.39%)
TOTAL
339766
100102 (-70.54%)

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
i3-7100
Test#1 (Integers)
31204
25769 (-17.42%)
Test#2 (FP)
27821
23261 (-16.39%)
Test#3 (Generic, ZIP)
6568
5432 (-17.29%)
Test#1 (Memory)
15004
4091 (-72.73%)
TOTAL
80598
58553 (-27.35%)

Multithread

i7-8700k

i3-7100
Test#1 (Integers)
202422
54982 (-72.84%)
Test#2 (FP)
186332
54727 (-70.63%)
Test#3 (Generic, ZIP)
44958
13117 (-70.82%)
Test#1 (Memory)
10054
3648 (-63.72%)
TOTAL
443765
126474 (-71.50%)

Performance/W
i7-8700k
i3-7100
Test#1 (Integers)
2131 points/W
1078 points/W
Test#2 (FP)
1961 points/W
1073 points/W
Test#3 (Generic, ZIP)
473 points/W
257 points/W
Test#1 (Memory)
106 points/W
72 points/W
TOTAL
4671 points/W
2480 points/W

Performance/GHz
i7-8700k
i3-7100
Test#1 (Integers)
6639 points/GHz
6607 points/GHz
Test#2 (FP)
5919 points/GHz
5964 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1393 points/GHz
Test#1 (Memory)
3192 points/GHz
1049 points/GHz
TOTAL
17148 points/GHz
15014 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