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Core i7-8700k vs i7-7700K


Description
The i7-8700k is based on Coffee Lake architecture while the i7-7700K 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 i7-7700K gets 292.3 k points.

Summarizing, the i7-8700k is 1.5 times faster than the i7-7700K . 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
4.2 GHz
Boost frecuency
4.7 GHz
4.5 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
September 2016

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
i7-7700K
Test#1 (Integers)
4127
4629 (12.18%)
Test#2 (FP)
16959
18925 (11.59%)
Test#3 (Generic, ZIP)
5564
6221 (11.82%)
Test#1 (Memory)
12845
13922 (8.38%)
TOTAL
39495
43698 (10.64%)

Multithread

i7-8700k

i7-7700K
Test#1 (Integers)
24011
18529 (-22.83%)
Test#2 (FP)
108690
86487 (-20.43%)
Test#3 (Generic, ZIP)
36616
28778 (-21.41%)
Test#1 (Memory)
9327
9674 (3.73%)
TOTAL
178644
143468 (-19.69%)

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
i7-7700K
Test#1 (Integers)
16874
17549 (4.00%)
Test#2 (FP)
26119
27822 (6.52%)
Test#3 (Generic, ZIP)
6329
6796 (7.38%)
Test#1 (Memory)
13708
14832 (8.20%)
TOTAL
63030
66999 (6.30%)

Multithread

i7-8700k

i7-7700K
Test#1 (Integers)
105740
68395 (-35.32%)
Test#2 (FP)
180520
118805 (-34.19%)
Test#3 (Generic, ZIP)
44994
33336 (-25.91%)
Test#1 (Memory)
8512
17434 (104.82%)
TOTAL
339766
237970 (-29.96%)

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
i7-7700K
Test#1 (Integers)
31204
30879 (-1.04%)
Test#2 (FP)
27821
27266 (-2.00%)
Test#3 (Generic, ZIP)
6568
6416 (-2.31%)
Test#1 (Memory)
15004
14011 (-6.62%)
TOTAL
80598
78572 (-2.51%)

Multithread

i7-8700k

i7-7700K
Test#1 (Integers)
202422
130361 (-35.60%)
Test#2 (FP)
186332
122434 (-34.29%)
Test#3 (Generic, ZIP)
44958
29679 (-33.98%)
Test#1 (Memory)
10054
9830 (-2.22%)
TOTAL
443765
292304 (-34.13%)

Performance/W
i7-8700k
i7-7700K
Test#1 (Integers)
2131 points/W
1372 points/W
Test#2 (FP)
1961 points/W
1289 points/W
Test#3 (Generic, ZIP)
473 points/W
312 points/W
Test#1 (Memory)
106 points/W
103 points/W
TOTAL
4671 points/W
3077 points/W

Performance/GHz
i7-8700k
i7-7700K
Test#1 (Integers)
6639 points/GHz
6862 points/GHz
Test#2 (FP)
5919 points/GHz
6059 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1426 points/GHz
Test#1 (Memory)
3192 points/GHz
3114 points/GHz
TOTAL
17148 points/GHz
17460 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