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Core i7-8700k vs i9-7980XE


Description
The i7-8700k is based on Coffee Lake architecture while the i9-7980XE is based on Skylake.

Using the multithread performance as a reference, the i7-8700k gets a score of 443.8 k points while the i9-7980XE gets 1223.8 k points.

Summarizing, the i9-7980XE is 2.8 times faster than the i7-8700k. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
50654
Core
Coffee Lake-S
Skylake-X
Architecture
Base frecuency
3.7 GHz
2.6 GHz
Boost frecuency
4.7 GHz
4.4 GHz
Socket
LGA 1151
LGA 2066
Cores/Threads
6/12
18/36
TDP
95 W
165 W
Cache L1 (d+i)
6x32+6x32 kB
18x32+18x32 kB
Cache L2
6x256 kB
18x1024 kB
Cache L3
12288 kB
25344 kB
Date
October 2017
May 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
i7-8700k
i9-7980XE
Test#1 (Integers)
4127
4889 (18.46%)
Test#2 (FP)
16959
19975 (17.79%)
Test#3 (Generic, ZIP)
5564
6145 (10.44%)
Test#1 (Memory)
12845
9812 (-23.61%)
TOTAL
39495
40821 (3.36%)

Multithread

i7-8700k

i9-7980XE
Test#1 (Integers)
24011
79802 (232.35%)
Test#2 (FP)
108690
372721 (242.92%)
Test#3 (Generic, ZIP)
36616
121424 (231.61%)
Test#1 (Memory)
9327
26481 (183.93%)
TOTAL
178644
600427 (236.10%)

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
i9-7980XE
Test#1 (Integers)
31204
31156 (-0.15%)
Test#2 (FP)
27821
28125 (1.09%)
Test#3 (Generic, ZIP)
6568
6651 (1.27%)
Test#1 (Memory)
15004
10498 (-30.03%)
TOTAL
80598
76431 (-5.17%)

Multithread

i7-8700k

i9-7980XE
Test#1 (Integers)
202422
560190 (176.74%)
Test#2 (FP)
186332
516975 (177.45%)
Test#3 (Generic, ZIP)
44958
123940 (175.68%)
Test#1 (Memory)
10054
22687 (125.67%)
TOTAL
443765
1223792 (175.77%)

Performance/W
i7-8700k
i9-7980XE
Test#1 (Integers)
2131 points/W
3395 points/W
Test#2 (FP)
1961 points/W
3133 points/W
Test#3 (Generic, ZIP)
473 points/W
751 points/W
Test#1 (Memory)
106 points/W
137 points/W
TOTAL
4671 points/W
7417 points/W

Performance/GHz
i7-8700k
i9-7980XE
Test#1 (Integers)
6639 points/GHz
7081 points/GHz
Test#2 (FP)
5919 points/GHz
6392 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1512 points/GHz
Test#1 (Memory)
3192 points/GHz
2386 points/GHz
TOTAL
17148 points/GHz
17371 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