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Core i7-6700K vs i5-8250U


Description
The i7-6700K is based on Skylake architecture while the i5-8250U 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 i5-8250U gets 161.3 k points.

Summarizing, the i7-6700K is 1.6 times faster than the i5-8250U. 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
1.6 GHz
Boost frecuency
4.2 GHz
3.4 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
6144 kB
Date
May 2015
August 2017
Mean monothread perf.
63.22k points
54.31k points
Mean multithread perf.
254.56k points
161.26k 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
i5-8250U
Test#1 (Integers)
4.07k
3.32k (x0.82)
Test#2 (FP)
16.62k
13.5k (x0.81)
Test#3 (Generic, ZIP)
5.23k
4.11k (x0.79)
Test#1 (Memory)
6.28k
7.42k (x1.18)
TOTAL
32.2k
28.34k (x0.88)

Multithread

i7-6700K

i5-8250U
Test#1 (Integers)
16.37k
13.97k (x0.85)
Test#2 (FP)
77.34k
50.8k (x0.66)
Test#3 (Generic, ZIP)
25.65k
14.71k (x0.57)
Test#1 (Memory)
10.21k
4.76k (x0.47)
TOTAL
129.57k
84.24k (x0.65)

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
i5-8250U
Test#1 (Integers)
14.73k
12.41k (x0.84)
Test#2 (FP)
21.27k
18.11k (x0.85)
Test#3 (Generic, ZIP)
5.52k
4.79k (x0.87)
Test#1 (Memory)
6.32k
8.16k (x1.29)
TOTAL
47.84k
43.46k (x0.91)

Multithread

i7-6700K

i5-8250U
Test#1 (Integers)
61.09k
42.48k (x0.7)
Test#2 (FP)
99.17k
60.2k (x0.61)
Test#3 (Generic, ZIP)
26.57k
14.85k (x0.56)
Test#1 (Memory)
10.26k
4.77k (x0.46)
TOTAL
197.09k
122.3k (x0.62)

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
i5-8250U
Test#1 (Integers)
25.78k
22.11k (x0.86)
Test#2 (FP)
23.08k
19.64k (x0.85)
Test#3 (Generic, ZIP)
5.32k
4.54k (x0.85)
Test#1 (Memory)
9.03k
8.03k (x0.89)
TOTAL
63.22k
54.31k (x0.86)

Multithread

i7-6700K

i5-8250U
Test#1 (Integers)
112.83k
74.19k (x0.66)
Test#2 (FP)
106.86k
66.27k (x0.62)
Test#3 (Generic, ZIP)
25.76k
15.97k (x0.62)
Test#1 (Memory)
9.12k
4.83k (x0.53)
TOTAL
254.56k
161.26k (x0.63)

Performance/W
i7-6700K
i5-8250U
Test#1 (Integers)
1188 points/W
4946 points/W
Test#2 (FP)
1125 points/W
4418 points/W
Test#3 (Generic, ZIP)
271 points/W
1065 points/W
Test#1 (Memory)
96 points/W
322 points/W
TOTAL
2680 points/W
10751 points/W

Performance/GHz
i7-6700K
i5-8250U
Test#1 (Integers)
6139 points/GHz
6503 points/GHz
Test#2 (FP)
5495 points/GHz
5777 points/GHz
Test#3 (Generic, ZIP)
1268 points/GHz
1334 points/GHz
Test#1 (Memory)
2150 points/GHz
2361 points/GHz
TOTAL
15052 points/GHz
15975 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