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Core i7-6700K vs i7-8550U


Description
The i7-6700K is based on Skylake architecture while the i7-8550U is based on Kaby Lake.

Using the multithread performance as a reference, the i7-6700K gets a score of 254.6 k points while the i7-8550U gets 166.1 k points.

Summarizing, the i7-6700K is 1.5 times faster than the i7-8550U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
506e3
806ea
Core
Skylake-S
Kaby Lake-R
Architecture
Base frecuency
4 GHz
1.8 GHz
Boost frecuency
4.2 GHz
4 GHz
Socket
LGA 1151
BGA1356
Cores/Threads
4/8
4/8
TDP
95 W
15 W
Cache L1 (d+i)
4x32+4x32 kB
4x32+4x32 kB
Cache L2
256 kB
4x256 kB
Cache L3
8192 kB
8192 kB
Date
May 2015
August 2017
Mean monothread perf.
63.22k points
64.2k points
Mean multithread perf.
254.56k points
166.12k 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
i7-6700K
i7-8550U
Test#1 (Integers)
4.07k
3.91k (x0.96)
Test#2 (FP)
16.62k
15.98k (x0.96)
Test#3 (Generic, ZIP)
5.23k
5.11k (x0.98)
Test#1 (Memory)
6.28k
11.05k (x1.76)
TOTAL
32.2k
36.05k (x1.12)

Multithread

i7-6700K

i7-8550U
Test#1 (Integers)
16.37k
11.76k (x0.72)
Test#2 (FP)
77.34k
50.15k (x0.65)
Test#3 (Generic, ZIP)
25.65k
16.76k (x0.65)
Test#1 (Memory)
10.21k
4.17k (x0.41)
TOTAL
129.57k
82.84k (x0.64)

SSE3 optimized benchmark
The benchmark in mode I (SSE) is optimized for the use of SIMD instructions with 128 bits register and the SSE set up to version 3. Nearly every modern CPU has support for this mode.
Monothread
i7-6700K
i7-8550U
Test#1 (Integers)
14.73k
12.93k (x0.88)
Test#2 (FP)
21.27k
20.59k (x0.97)
Test#3 (Generic, ZIP)
5.52k
5.41k (x0.98)
Test#1 (Memory)
6.32k
10.48k (x1.66)
TOTAL
47.84k
49.41k (x1.03)

Multithread

i7-6700K

i7-8550U
Test#1 (Integers)
61.09k
41.11k (x0.67)
Test#2 (FP)
99.17k
65.04k (x0.66)
Test#3 (Generic, ZIP)
26.57k
17.53k (x0.66)
Test#1 (Memory)
10.26k
4.22k (x0.41)
TOTAL
197.09k
127.9k (x0.65)

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
i7-6700K
i7-8550U
Test#1 (Integers)
25.78k
25.37k (x0.98)
Test#2 (FP)
23.08k
22.6k (x0.98)
Test#3 (Generic, ZIP)
5.32k
5.13k (x0.96)
Test#1 (Memory)
9.03k
11.1k (x1.23)
TOTAL
63.22k
64.2k (x1.02)

Multithread

i7-6700K

i7-8550U
Test#1 (Integers)
112.83k
72.82k (x0.65)
Test#2 (FP)
106.86k
71.71k (x0.67)
Test#3 (Generic, ZIP)
25.76k
17.35k (x0.67)
Test#1 (Memory)
9.12k
4.24k (x0.46)
TOTAL
254.56k
166.12k (x0.65)

Performance/W
i7-6700K
i7-8550U
Test#1 (Integers)
1188 points/W
4855 points/W
Test#2 (FP)
1125 points/W
4781 points/W
Test#3 (Generic, ZIP)
271 points/W
1157 points/W
Test#1 (Memory)
96 points/W
282 points/W
TOTAL
2680 points/W
11075 points/W

Performance/GHz
i7-6700K
i7-8550U
Test#1 (Integers)
6139 points/GHz
6343 points/GHz
Test#2 (FP)
5495 points/GHz
5650 points/GHz
Test#3 (Generic, ZIP)
1268 points/GHz
1282 points/GHz
Test#1 (Memory)
2150 points/GHz
2774 points/GHz
TOTAL
15052 points/GHz
16049 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