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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
Mean monothread perf.
80.6k points
69.09k points
Mean multithread perf.
443.77k points
307.52k 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
i7-8700k
i5-8500
Test#1 (Integers)
4.13k
4.19k (x1.02)
Test#2 (FP)
16.96k
17.38k (x1.02)
Test#3 (Generic, ZIP)
5.56k
5.46k (x0.98)
Test#1 (Memory)
12.85k
11.92k (x0.93)
TOTAL
39.5k
38.96k (x0.99)

Multithread

i7-8700k

i5-8500
Test#1 (Integers)
24.01k
27.67k (x1.15)
Test#2 (FP)
108.69k
94.07k (x0.87)
Test#3 (Generic, ZIP)
36.62k
29.05k (x0.79)
Test#1 (Memory)
9.33k
4.39k (x0.47)
TOTAL
178.64k
155.18k (x0.87)

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)
12.92k
15.22k (x1.18)
Test#2 (FP)
20.68k
22.02k (x1.06)
Test#3 (Generic, ZIP)
5.3k
5.75k (x1.09)
Test#1 (Memory)
12.59k
12.17k (x0.97)
TOTAL
51.48k
55.17k (x1.07)

Multithread

i7-8700k

i5-8500
Test#1 (Integers)
94.26k
87.78k (x0.93)
Test#2 (FP)
152.55k
126.73k (x0.83)
Test#3 (Generic, ZIP)
39.74k
32.93k (x0.83)
Test#1 (Memory)
8.53k
4.22k (x0.49)
TOTAL
295.07k
251.65k (x0.85)

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)
16.87k
15.21k (x0.9)
Test#2 (FP)
26.12k
22.94k (x0.88)
Test#3 (Generic, ZIP)
6.33k
5.54k (x0.87)
Test#1 (Memory)
13.71k
11.39k (x0.83)
TOTAL
63.03k
55.07k (x0.87)

Multithread

i7-8700k

i5-8500
Test#1 (Integers)
105.74k
79.52k (x0.75)
Test#2 (FP)
180.52k
107.78k (x0.6)
Test#3 (Generic, ZIP)
44.99k
31.89k (x0.71)
Test#1 (Memory)
8.51k
13.37k (x1.57)
TOTAL
339.77k
232.55k (x0.68)

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)
31.2k
27.36k (x0.88)
Test#2 (FP)
27.82k
24.27k (x0.87)
Test#3 (Generic, ZIP)
6.57k
5.69k (x0.87)
Test#1 (Memory)
15k
11.77k (x0.78)
TOTAL
80.6k
69.09k (x0.86)

Multithread

i7-8700k

i5-8500
Test#1 (Integers)
202.42k
144.77k (x0.72)
Test#2 (FP)
186.33k
129.04k (x0.69)
Test#3 (Generic, ZIP)
44.96k
29.53k (x0.66)
Test#1 (Memory)
10.05k
4.18k (x0.42)
TOTAL
443.77k
307.52k (x0.69)

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. 3.11.4