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Core i7-7700K vs i7-8700k


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

Using the multithread performance as a reference, the i7-7700K gets a score of 291.1 k points while the i7-8700k gets 440.8 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
906e9
906ea
Core
Kaby Lake-S
Coffee Lake-S
Architecture
Base frecuency
4.2 GHz
3.7 GHz
Boost frecuency
4.5 GHz
4.7 GHz
Socket
LGA 1151
LGA 1151
Cores/Threads
4/8
6/12
TDP
95 W
95 W
Cache L1 (d+i)
32+32 kB
6x32+6x32 kB
Cache L2
256 kB
6x256 kB
Cache L3
8192 kB
12288 kB
Date
September 2016
October 2017

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
i7-7700K
i7-8700k
Test#1 (Integers)
4629
4127 (-10.85%)
Test#2 (FP)
18925
16959 (-10.39%)
Test#3 (Generic, ZIP)
6221
5564 (-10.57%)
Test#1 (Memory)
13922
12845 (-7.74%)
TOTAL
43698
39495 (-9.62%)

Multithread

i7-7700K

i7-8700k
Test#1 (Integers)
18529
24011 (29.59%)
Test#2 (FP)
86487
108690 (25.67%)
Test#3 (Generic, ZIP)
28778
36616 (27.24%)
Test#1 (Memory)
9674
9327 (-3.59%)
TOTAL
143468
178644 (24.52%)

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
i7-7700K
i7-8700k
Test#1 (Integers)
17549
16874 (-3.85%)
Test#2 (FP)
27822
26119 (-6.12%)
Test#3 (Generic, ZIP)
6796
6329 (-6.87%)
Test#1 (Memory)
14832
13708 (-7.57%)
TOTAL
66999
63030 (-5.92%)

Multithread

i7-7700K

i7-8700k
Test#1 (Integers)
68395
105740 (54.60%)
Test#2 (FP)
118805
180520 (51.95%)
Test#3 (Generic, ZIP)
33336
44994 (34.97%)
Test#1 (Memory)
17434
8512 (-51.18%)
TOTAL
237970
339766 (42.78%)

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
i7-7700K
i7-8700k
Test#1 (Integers)
30864
31057 (0.63%)
Test#2 (FP)
27262
27738 (1.75%)
Test#3 (Generic, ZIP)
6421
6573 (2.37%)
Test#1 (Memory)
13994
14996 (7.16%)
TOTAL
78541
80364 (2.32%)

Multithread

i7-7700K

i7-8700k
Test#1 (Integers)
129531
201030 (55.20%)
Test#2 (FP)
122200
184775 (51.21%)
Test#3 (Generic, ZIP)
29617
44705 (50.95%)
Test#1 (Memory)
9751
10281 (5.43%)
TOTAL
291099
440791 (51.42%)

Performance/W
i7-7700K
i7-8700k
Test#1 (Integers)
1363 points/W
2116 points/W
Test#2 (FP)
1286 points/W
1945 points/W
Test#3 (Generic, ZIP)
312 points/W
471 points/W
Test#1 (Memory)
103 points/W
108 points/W
TOTAL
3064 points/W
4640 points/W

Performance/GHz
i7-7700K
i7-8700k
Test#1 (Integers)
6859 points/GHz
6608 points/GHz
Test#2 (FP)
6058 points/GHz
5902 points/GHz
Test#3 (Generic, ZIP)
1427 points/GHz
1399 points/GHz
Test#1 (Memory)
3110 points/GHz
3191 points/GHz
TOTAL
17453 points/GHz
17099 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