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Core i9-7980XE vs i7-8700k


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

Using the multithread performance as a reference, the i9-7980XE gets a score of 1223.8 k points while the i7-8700k gets 443.8 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
50654
906ea
Core
Skylake-X
Coffee Lake-S
Architecture
Base frecuency
2.6 GHz
3.7 GHz
Boost frecuency
4.4 GHz
4.7 GHz
Socket
LGA 2066
LGA 1151
Cores/Threads
18/36
6/12
TDP
165 W
95 W
Cache L1 (d+i)
18x32+18x32 kB
6x32+6x32 kB
Cache L2
18x1024 kB
6x256 kB
Cache L3
25344 kB
12288 kB
Date
May 2017
October 2017
Mean monothread perf.
76.43k points
80.6k points
Mean multithread perf.
1223.79k points
443.77k points

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
i9-7980XE
i7-8700k
Test#1 (Integers)
4.89k
4.13k (x0.84)
Test#2 (FP)
19.98k
16.96k (x0.85)
Test#3 (Generic, ZIP)
6.14k
5.56k (x0.91)
Test#1 (Memory)
9.81k
12.85k (x1.31)
TOTAL
40.82k
39.5k (x0.97)

Multithread

i9-7980XE

i7-8700k
Test#1 (Integers)
79.8k
24.01k (x0.3)
Test#2 (FP)
372.72k
108.69k (x0.29)
Test#3 (Generic, ZIP)
121.42k
36.62k (x0.3)
Test#1 (Memory)
26.48k
9.33k (x0.35)
TOTAL
600.43k
178.64k (x0.3)

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
i9-7980XE
i7-8700k
Test#1 (Integers)
31.16k
31.2k (x1)
Test#2 (FP)
28.13k
27.82k (x0.99)
Test#3 (Generic, ZIP)
6.65k
6.57k (x0.99)
Test#1 (Memory)
10.5k
15k (x1.43)
TOTAL
76.43k
80.6k (x1.05)

Multithread

i9-7980XE

i7-8700k
Test#1 (Integers)
560.19k
202.42k (x0.36)
Test#2 (FP)
516.97k
186.33k (x0.36)
Test#3 (Generic, ZIP)
123.94k
44.96k (x0.36)
Test#1 (Memory)
22.69k
10.05k (x0.44)
TOTAL
1223.79k
443.77k (x0.36)

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

Performance/GHz
i9-7980XE
i7-8700k
Test#1 (Integers)
7081 points/GHz
6639 points/GHz
Test#2 (FP)
6392 points/GHz
5919 points/GHz
Test#3 (Generic, ZIP)
1512 points/GHz
1397 points/GHz
Test#1 (Memory)
2386 points/GHz
3192 points/GHz
TOTAL
17371 points/GHz
17148 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. 3.11.4