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Core i7-8700k vs i5-8250U


Description
The i7-8700k is based on Coffee Lake architecture while the i5-8250U is based on Kaby Lake.

Using the multithread performance as a reference, the i7-8700k gets a score of 443.8 k points while the i5-8250U gets 176 k points.

Summarizing, the i7-8700k is 2.5 times faster than the i5-8250U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
806ea
Core
Coffee Lake-S
Kaby Lake-R
Architecture
Base frecuency
3.7 GHz
1.6 GHz
Boost frecuency
4.7 GHz
3.4 GHz
Socket
LGA 1151
BGA1356
Cores/Threads
6/12
4/8
TDP
95 W
15 W
Cache L1 (d+i)
6x32+6x32 kB
4x32+4x32 kB
Cache L2
6x256 kB
4x256 kB
Cache L3
12288 kB
6144 kB
Date
October 2017
August 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
i7-8700k
i5-8250U
Test#1 (Integers)
4127
3322 (-19.51%)
Test#2 (FP)
16959
13499 (-20.40%)
Test#3 (Generic, ZIP)
5564
4105 (-26.22%)
Test#1 (Memory)
12845
7416 (-42.27%)
TOTAL
39495
28342 (-28.24%)

Multithread

i7-8700k

i5-8250U
Test#1 (Integers)
24011
13969 (-41.82%)
Test#2 (FP)
108690
50797 (-53.26%)
Test#3 (Generic, ZIP)
36616
14713 (-59.82%)
Test#1 (Memory)
9327
4763 (-48.93%)
TOTAL
178644
84242 (-52.84%)

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
i7-8700k
i5-8250U
Test#1 (Integers)
12920
12410 (-3.95%)
Test#2 (FP)
20678
18112 (-12.41%)
Test#3 (Generic, ZIP)
5295
4785 (-9.63%)
Test#1 (Memory)
12587
8157 (-35.19%)
TOTAL
51480
43464 (-15.57%)

Multithread

i7-8700k

i5-8250U
Test#1 (Integers)
94259
42479 (-54.93%)
Test#2 (FP)
152549
60203 (-60.54%)
Test#3 (Generic, ZIP)
39735
14850 (-62.63%)
Test#1 (Memory)
8527
4770 (-44.07%)
TOTAL
295071
122301 (-58.55%)

AVX optimized benchmark
The benchmark in mode II (AVX) is optimized to used 256 bits registers beside the first version of the Advanced Vector Extensions (AVX). The first AVX compatible CPU was released in 2011.
Monothread
i7-8700k
i5-8250U
Test#1 (Integers)
16874
12588 (-25.40%)
Test#2 (FP)
26119
18890 (-27.68%)
Test#3 (Generic, ZIP)
6329
4648 (-26.56%)
Test#1 (Memory)
13708
8197 (-40.21%)
TOTAL
63030
44322 (-29.68%)

Multithread

i7-8700k

i5-8250U
Test#1 (Integers)
105740
45911 (-56.58%)
Test#2 (FP)
180520
69550 (-61.47%)
Test#3 (Generic, ZIP)
44994
16795 (-62.67%)
Test#1 (Memory)
8512
4830 (-43.25%)
TOTAL
339766
137086 (-59.65%)

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
i7-8700k
i5-8250U
Test#1 (Integers)
31204
22022 (-29.43%)
Test#2 (FP)
27821
19620 (-29.48%)
Test#3 (Generic, ZIP)
6568
4660 (-29.04%)
Test#1 (Memory)
15004
8550 (-43.02%)
TOTAL
80598
54852 (-31.94%)

Multithread

i7-8700k

i5-8250U
Test#1 (Integers)
202422
83330 (-58.83%)
Test#2 (FP)
186332
70301 (-62.27%)
Test#3 (Generic, ZIP)
44958
17159 (-61.83%)
Test#1 (Memory)
10054
5175 (-48.53%)
TOTAL
443765
175965 (-60.35%)

Performance/W
i7-8700k
i5-8250U
Test#1 (Integers)
2131 points/W
5555 points/W
Test#2 (FP)
1961 points/W
4687 points/W
Test#3 (Generic, ZIP)
473 points/W
1144 points/W
Test#1 (Memory)
106 points/W
345 points/W
TOTAL
4671 points/W
11731 points/W

Performance/GHz
i7-8700k
i5-8250U
Test#1 (Integers)
6639 points/GHz
6477 points/GHz
Test#2 (FP)
5919 points/GHz
5771 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1371 points/GHz
Test#1 (Memory)
3192 points/GHz
2515 points/GHz
TOTAL
17148 points/GHz
16133 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