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Core i7-8700k vs i3-8350K


Description
Both models i7-8700k and i3-8350K 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 i3-8350K gets 237.6 k points.

Summarizing, the i7-8700k is 1.9 times faster than the i3-8350K. 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
4 GHz
Boost frecuency
4.7 GHz
4 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/12
4/4
TDP
95 W
91 W
Cache L1 (d+i)
6x32+6x32 kB
4x32+4x32 kB
Cache L2
6x256 kB
4x256 kB
Cache L3
12288 kB
8192 kB
Date
October 2017
October 2017

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
i3-8350K
Test#1 (Integers)
31204
27293 (-12.53%)
Test#2 (FP)
27821
24192 (-13.04%)
Test#3 (Generic, ZIP)
6568
5746 (-12.52%)
Test#1 (Memory)
15004
11134 (-25.79%)
TOTAL
80598
68365 (-15.18%)

Multithread

i7-8700k

i3-8350K
Test#1 (Integers)
202422
107778 (-46.76%)
Test#2 (FP)
186332
95935 (-48.51%)
Test#3 (Generic, ZIP)
44958
22653 (-49.61%)
Test#1 (Memory)
10054
11262 (12.02%)
TOTAL
443765
237627 (-46.45%)

Performance/W
i7-8700k
i3-8350K
Test#1 (Integers)
2131 points/W
1184 points/W
Test#2 (FP)
1961 points/W
1054 points/W
Test#3 (Generic, ZIP)
473 points/W
249 points/W
Test#1 (Memory)
106 points/W
124 points/W
TOTAL
4671 points/W
2611 points/W

Performance/GHz
i7-8700k
i3-8350K
Test#1 (Integers)
6639 points/GHz
6823 points/GHz
Test#2 (FP)
5919 points/GHz
6048 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1436 points/GHz
Test#1 (Memory)
3192 points/GHz
2784 points/GHz
TOTAL
17148 points/GHz
17091 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