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Core i7-8700k vs i5-8500


Description
Both models i7-8700k and i5-8500 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 i5-8500 gets 307.5 k points.

Summarizing, the i7-8700k is 1.4 times faster than the i5-8500. 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
3.7 GHz
3 GHz
Boost frecuency
4.7 GHz
4.1 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/12
6/6
TDP
95 W
65 W
Cache L1 (d+i)
6x32+6x32 kB
6x32+6x32 kB
Cache L2
6x256 kB
6x256 kB
Cache L3
12288 kB
9216 kB
Date
October 2017
March 2018

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
i5-8500
Test#1 (Integers)
4127
4192 (1.57%)
Test#2 (FP)
16959
17378 (2.47%)
Test#3 (Generic, ZIP)
5564
5462 (-1.84%)
Test#1 (Memory)
12845
11924 (-7.17%)
TOTAL
39495
38956 (-1.37%)

Multithread

i7-8700k

i5-8500
Test#1 (Integers)
24011
27672 (15.25%)
Test#2 (FP)
108690
94071 (-13.45%)
Test#3 (Generic, ZIP)
36616
29055 (-20.65%)
Test#1 (Memory)
9327
4386 (-52.97%)
TOTAL
178644
155184 (-13.13%)

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
i5-8500
Test#1 (Integers)
12920
15225 (17.84%)
Test#2 (FP)
20678
22020 (6.49%)
Test#3 (Generic, ZIP)
5295
5746 (8.51%)
Test#1 (Memory)
12587
12175 (-3.27%)
TOTAL
51480
55165 (7.16%)

Multithread

i7-8700k

i5-8500
Test#1 (Integers)
94259
87781 (-6.87%)
Test#2 (FP)
152549
126729 (-16.93%)
Test#3 (Generic, ZIP)
39735
32928 (-17.13%)
Test#1 (Memory)
8527
4215 (-50.57%)
TOTAL
295071
251654 (-14.71%)

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
i5-8500
Test#1 (Integers)
16874
15208 (-9.87%)
Test#2 (FP)
26119
22940 (-12.17%)
Test#3 (Generic, ZIP)
6329
5538 (-12.50%)
Test#1 (Memory)
13708
11389 (-16.92%)
TOTAL
63030
55075 (-12.62%)

Multithread

i7-8700k

i5-8500
Test#1 (Integers)
105740
79517 (-24.80%)
Test#2 (FP)
180520
107776 (-40.30%)
Test#3 (Generic, ZIP)
44994
31885 (-29.13%)
Test#1 (Memory)
8512
13367 (57.04%)
TOTAL
339766
232546 (-31.56%)

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
i5-8500
Test#1 (Integers)
31204
27359 (-12.32%)
Test#2 (FP)
27821
24271 (-12.76%)
Test#3 (Generic, ZIP)
6568
5691 (-13.35%)
Test#1 (Memory)
15004
11765 (-21.59%)
TOTAL
80598
69087 (-14.28%)

Multithread

i7-8700k

i5-8500
Test#1 (Integers)
202422
144773 (-28.48%)
Test#2 (FP)
186332
129040 (-30.75%)
Test#3 (Generic, ZIP)
44958
29526 (-34.33%)
Test#1 (Memory)
10054
4185 (-58.37%)
TOTAL
443765
307524 (-30.70%)

Performance/W
i7-8700k
i5-8500
Test#1 (Integers)
2131 points/W
2227 points/W
Test#2 (FP)
1961 points/W
1985 points/W
Test#3 (Generic, ZIP)
473 points/W
454 points/W
Test#1 (Memory)
106 points/W
64 points/W
TOTAL
4671 points/W
4731 points/W

Performance/GHz
i7-8700k
i5-8500
Test#1 (Integers)
6639 points/GHz
6673 points/GHz
Test#2 (FP)
5919 points/GHz
5920 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1388 points/GHz
Test#1 (Memory)
3192 points/GHz
2870 points/GHz
TOTAL
17148 points/GHz
16850 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