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Core i7-7700K vs i9-7980XE


Description
The i7-7700K is based on Kaby Lake architecture while the i9-7980XE is based on Skylake.

Using the multithread performance as a reference, the i7-7700K gets a score of 291.1 k points while the i9-7980XE gets 1223.8 k points.

Summarizing, the i9-7980XE is 4.2 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
50654
Core
Kaby Lake-S
Skylake-X
Architecture
Base frecuency
4.2 GHz
2.6 GHz
Boost frecuency
4.5 GHz
4.4 GHz
Socket
LGA 1151
LGA 2066
Cores/Threads
4/8
18/36
TDP
95 W
165 W
Cache L1 (d+i)
32+32 kB
18x32+18x32 kB
Cache L2
256 kB
18x1024 kB
Cache L3
8192 kB
25344 kB
Date
September 2016
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
i7-7700K
i9-7980XE
Test#1 (Integers)
4629
4889 (5.60%)
Test#2 (FP)
18925
19975 (5.55%)
Test#3 (Generic, ZIP)
6221
6145 (-1.23%)
Test#1 (Memory)
13922
9812 (-29.52%)
TOTAL
43698
40821 (-6.58%)

Multithread

i7-7700K

i9-7980XE
Test#1 (Integers)
18529
79802 (330.68%)
Test#2 (FP)
86487
372721 (330.96%)
Test#3 (Generic, ZIP)
28778
121424 (321.93%)
Test#1 (Memory)
9674
26481 (173.73%)
TOTAL
143468
600427 (318.51%)

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
i9-7980XE
Test#1 (Integers)
30864
31156 (0.95%)
Test#2 (FP)
27262
28125 (3.17%)
Test#3 (Generic, ZIP)
6421
6651 (3.59%)
Test#1 (Memory)
13994
10498 (-24.98%)
TOTAL
78541
76431 (-2.69%)

Multithread

i7-7700K

i9-7980XE
Test#1 (Integers)
129531
560190 (332.48%)
Test#2 (FP)
122200
516975 (323.06%)
Test#3 (Generic, ZIP)
29617
123940 (318.48%)
Test#1 (Memory)
9751
22687 (132.66%)
TOTAL
291099
1223792 (320.40%)

Performance/W
i7-7700K
i9-7980XE
Test#1 (Integers)
1363 points/W
3395 points/W
Test#2 (FP)
1286 points/W
3133 points/W
Test#3 (Generic, ZIP)
312 points/W
751 points/W
Test#1 (Memory)
103 points/W
137 points/W
TOTAL
3064 points/W
7417 points/W

Performance/GHz
i7-7700K
i9-7980XE
Test#1 (Integers)
6859 points/GHz
7081 points/GHz
Test#2 (FP)
6058 points/GHz
6392 points/GHz
Test#3 (Generic, ZIP)
1427 points/GHz
1512 points/GHz
Test#1 (Memory)
3110 points/GHz
2386 points/GHz
TOTAL
17453 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