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Core i7-8700k vs i7-7700


Description
The i7-8700k is based on Coffee Lake architecture while the i7-7700 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 i7-7700 gets 262.2 k points.

Summarizing, the i7-8700k is 1.7 times faster than the i7-7700 . 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
3.6 GHz
Boost frecuency
4.7 GHz
4.2 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
6/12
4/8
TDP
95 W
65 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
i7-7700
Test#1 (Integers)
4127
4303 (4.26%)
Test#2 (FP)
16959
17621 (3.90%)
Test#3 (Generic, ZIP)
5564
5536 (-0.51%)
Test#1 (Memory)
12845
11726 (-8.72%)
TOTAL
39495
39185 (-0.79%)

Multithread

i7-8700k

i7-7700
Test#1 (Integers)
24011
16796 (-30.05%)
Test#2 (FP)
108690
78082 (-28.16%)
Test#3 (Generic, ZIP)
36616
26792 (-26.83%)
Test#1 (Memory)
9327
4103 (-56.01%)
TOTAL
178644
125773 (-29.60%)

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
i7-7700
Test#1 (Integers)
16874
15274 (-9.48%)
Test#2 (FP)
26119
23432 (-10.29%)
Test#3 (Generic, ZIP)
6329
5940 (-6.14%)
Test#1 (Memory)
13708
10451 (-23.76%)
TOTAL
63030
55098 (-12.58%)

Multithread

i7-8700k

i7-7700
Test#1 (Integers)
105740
63017 (-40.40%)
Test#2 (FP)
180520
105046 (-41.81%)
Test#3 (Generic, ZIP)
44994
26438 (-41.24%)
Test#1 (Memory)
8512
4035 (-52.60%)
TOTAL
339766
198535 (-41.57%)

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
i7-7700
Test#1 (Integers)
31204
27175 (-12.91%)
Test#2 (FP)
27821
25094 (-9.80%)
Test#3 (Generic, ZIP)
6568
5794 (-11.78%)
Test#1 (Memory)
15004
12848 (-14.38%)
TOTAL
80598
70911 (-12.02%)

Multithread

i7-8700k

i7-7700
Test#1 (Integers)
202422
120948 (-40.25%)
Test#2 (FP)
186332
109758 (-41.10%)
Test#3 (Generic, ZIP)
44958
27356 (-39.15%)
Test#1 (Memory)
10054
4133 (-58.89%)
TOTAL
443765
262195 (-40.92%)

Performance/W
i7-8700k
i7-7700
Test#1 (Integers)
2131 points/W
1861 points/W
Test#2 (FP)
1961 points/W
1689 points/W
Test#3 (Generic, ZIP)
473 points/W
421 points/W
Test#1 (Memory)
106 points/W
64 points/W
TOTAL
4671 points/W
4034 points/W

Performance/GHz
i7-8700k
i7-7700
Test#1 (Integers)
6639 points/GHz
6470 points/GHz
Test#2 (FP)
5919 points/GHz
5975 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1380 points/GHz
Test#1 (Memory)
3192 points/GHz
3059 points/GHz
TOTAL
17148 points/GHz
16884 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