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Core i7-8700k vs i7-6700K


Description
The i7-8700k is based on Coffee Lake architecture while the i7-6700K is based on Skylake.

Using the multithread performance as a reference, the i7-8700k gets a score of 443.8 k points while the i7-6700K gets 254.6 k points.

Summarizing, the i7-8700k is 1.7 times faster than the i7-6700K . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
506e3
Core
Coffee Lake-S
Skylake-S
Architecture
Base frecuency
3.7 GHz
4 GHz
Boost frecuency
4.7 GHz
4.2 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/12
4/8
TDP
95 W
95 W
Cache L1 (d+i)
6x32+6x32 kB
32+32 kB
Cache L2
6x256 kB
256 kB
Cache L3
12288 kB
8192 kB
Date
October 2017
May 2015

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
i7-6700K
Test#1 (Integers)
4127
4072 (-1.33%)
Test#2 (FP)
16959
16620 (-2.00%)
Test#3 (Generic, ZIP)
5564
5225 (-6.09%)
Test#1 (Memory)
12845
6279 (-51.12%)
TOTAL
39495
32196 (-18.48%)

Multithread

i7-8700k

i7-6700K
Test#1 (Integers)
24011
16366 (-31.84%)
Test#2 (FP)
108690
77341 (-28.84%)
Test#3 (Generic, ZIP)
36616
25654 (-29.94%)
Test#1 (Memory)
9327
10206 (9.43%)
TOTAL
178644
129568 (-27.47%)

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
i7-6700K
Test#1 (Integers)
12920
14733 (14.03%)
Test#2 (FP)
20678
21273 (2.87%)
Test#3 (Generic, ZIP)
5295
5516 (4.17%)
Test#1 (Memory)
12587
6320 (-49.79%)
TOTAL
51480
47841 (-7.07%)

Multithread

i7-8700k

i7-6700K
Test#1 (Integers)
94259
61093 (-35.19%)
Test#2 (FP)
152549
99165 (-34.99%)
Test#3 (Generic, ZIP)
39735
26574 (-33.12%)
Test#1 (Memory)
8527
10257 (20.28%)
TOTAL
295071
197089 (-33.21%)

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
i7-6700K
Test#1 (Integers)
31204
25782 (-17.38%)
Test#2 (FP)
27821
23081 (-17.04%)
Test#3 (Generic, ZIP)
6568
5325 (-18.92%)
Test#1 (Memory)
15004
9031 (-39.81%)
TOTAL
80598
63219 (-21.56%)

Multithread

i7-8700k

i7-6700K
Test#1 (Integers)
202422
112827 (-44.26%)
Test#2 (FP)
186332
106861 (-42.65%)
Test#3 (Generic, ZIP)
44958
25758 (-42.71%)
Test#1 (Memory)
10054
9116 (-9.33%)
TOTAL
443765
254562 (-42.64%)

Performance/W
i7-8700k
i7-6700K
Test#1 (Integers)
2131 points/W
1188 points/W
Test#2 (FP)
1961 points/W
1125 points/W
Test#3 (Generic, ZIP)
473 points/W
271 points/W
Test#1 (Memory)
106 points/W
96 points/W
TOTAL
4671 points/W
2680 points/W

Performance/GHz
i7-8700k
i7-6700K
Test#1 (Integers)
6639 points/GHz
6139 points/GHz
Test#2 (FP)
5919 points/GHz
5495 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1268 points/GHz
Test#1 (Memory)
3192 points/GHz
2150 points/GHz
TOTAL
17148 points/GHz
15052 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