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Core i5-8250U vs i7-6700K


Description
The i5-8250U is based on Kaby Lake architecture while the i7-6700K is based on Skylake.

Using the multithread performance as a reference, the i5-8250U gets a score of 161.3 k points while the i7-6700K gets 254.6 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
806ea
506e3
Core
Kaby Lake-R
Skylake-S
Architecture
Base frecuency
1.6 GHz
4 GHz
Boost frecuency
3.4 GHz
4.2 GHz
Socket
BGA1356
LGA 1151
Cores/Threads
4/8
4/8
TDP
15 W
95 W
Cache L1 (d+i)
4x32+4x32 kB
4x32+4x32 kB
Cache L2
4x256 kB
256 kB
Cache L3
6144 kB
8192 kB
Date
August 2017
May 2015
Mean monothread perf.
54.31k points
63.22k points
Mean multithread perf.
161.26k points
254.56k 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
i5-8250U
i7-6700K
Test#1 (Integers)
3.32k
4.07k (x1.23)
Test#2 (FP)
13.5k
16.62k (x1.23)
Test#3 (Generic, ZIP)
4.11k
5.23k (x1.27)
Test#1 (Memory)
7.42k
6.28k (x0.85)
TOTAL
28.34k
32.2k (x1.14)

Multithread

i5-8250U

i7-6700K
Test#1 (Integers)
13.97k
16.37k (x1.17)
Test#2 (FP)
50.8k
77.34k (x1.52)
Test#3 (Generic, ZIP)
14.71k
25.65k (x1.74)
Test#1 (Memory)
4.76k
10.21k (x2.14)
TOTAL
84.24k
129.57k (x1.54)

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
i5-8250U
i7-6700K
Test#1 (Integers)
12.41k
14.73k (x1.19)
Test#2 (FP)
18.11k
21.27k (x1.17)
Test#3 (Generic, ZIP)
4.79k
5.52k (x1.15)
Test#1 (Memory)
8.16k
6.32k (x0.77)
TOTAL
43.46k
47.84k (x1.1)

Multithread

i5-8250U

i7-6700K
Test#1 (Integers)
42.48k
61.09k (x1.44)
Test#2 (FP)
60.2k
99.17k (x1.65)
Test#3 (Generic, ZIP)
14.85k
26.57k (x1.79)
Test#1 (Memory)
4.77k
10.26k (x2.15)
TOTAL
122.3k
197.09k (x1.61)

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
i5-8250U
i7-6700K
Test#1 (Integers)
22.11k
25.78k (x1.17)
Test#2 (FP)
19.64k
23.08k (x1.18)
Test#3 (Generic, ZIP)
4.54k
5.32k (x1.17)
Test#1 (Memory)
8.03k
9.03k (x1.12)
TOTAL
54.31k
63.22k (x1.16)

Multithread

i5-8250U

i7-6700K
Test#1 (Integers)
74.19k
112.83k (x1.52)
Test#2 (FP)
66.27k
106.86k (x1.61)
Test#3 (Generic, ZIP)
15.97k
25.76k (x1.61)
Test#1 (Memory)
4.83k
9.12k (x1.89)
TOTAL
161.26k
254.56k (x1.58)

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

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