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Core i7-8700k vs i5-8265U


Description
The i7-8700k is based on Coffee Lake architecture while the i5-8265U is based on Whiskey Lake.

Using the multithread performance as a reference, the i7-8700k gets a score of 443.8 k points while the i5-8265U gets 190 k points.

Summarizing, the i7-8700k is 2.3 times faster than the i5-8265U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
806ec
Core
Coffee Lake-S
Whiskey Lake-U
Architecture
Base frecuency
3.7 GHz
1.6 GHz
Boost frecuency
4.7 GHz
3.9 GHz
Socket
LGA 1151
BGA1528
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 2018

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
i5-8265U
Test#1 (Integers)
4127
3676 (-10.93%)
Test#2 (FP)
16959
16084 (-5.16%)
Test#3 (Generic, ZIP)
5564
4985 (-10.40%)
Test#1 (Memory)
12845
7948 (-38.13%)
TOTAL
39495
32693 (-17.22%)

Multithread

i7-8700k

i5-8265U
Test#1 (Integers)
24011
14285 (-40.51%)
Test#2 (FP)
108690
61154 (-43.74%)
Test#3 (Generic, ZIP)
36616
16527 (-54.86%)
Test#1 (Memory)
9327
3721 (-60.11%)
TOTAL
178644
95687 (-46.44%)

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
i5-8265U
Test#1 (Integers)
12920
13599 (5.26%)
Test#2 (FP)
20678
20026 (-3.15%)
Test#3 (Generic, ZIP)
5295
5195 (-1.90%)
Test#1 (Memory)
12587
7052 (-43.97%)
TOTAL
51480
45871 (-10.89%)

Multithread

i7-8700k

i5-8265U
Test#1 (Integers)
94259
51420 (-45.45%)
Test#2 (FP)
152549
77478 (-49.21%)
Test#3 (Generic, ZIP)
39735
16653 (-58.09%)
Test#1 (Memory)
8527
3687 (-56.76%)
TOTAL
295071
149239 (-49.42%)

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
i5-8265U
Test#1 (Integers)
16874
13657 (-19.06%)
Test#2 (FP)
26119
21172 (-18.94%)
Test#3 (Generic, ZIP)
6329
5001 (-20.98%)
Test#1 (Memory)
13708
8115 (-40.81%)
TOTAL
63030
47944 (-23.93%)

Multithread

i7-8700k

i5-8265U
Test#1 (Integers)
105740
51363 (-51.43%)
Test#2 (FP)
180520
79717 (-55.84%)
Test#3 (Generic, ZIP)
44994
16613 (-63.08%)
Test#1 (Memory)
8512
3748 (-55.97%)
TOTAL
339766
151440 (-55.43%)

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
i5-8265U
Test#1 (Integers)
31204
24140 (-22.64%)
Test#2 (FP)
27821
21605 (-22.35%)
Test#3 (Generic, ZIP)
6568
5147 (-21.64%)
Test#1 (Memory)
15004
7580 (-49.48%)
TOTAL
80598
58470 (-27.45%)

Multithread

i7-8700k

i5-8265U
Test#1 (Integers)
202422
87571 (-56.74%)
Test#2 (FP)
186332
81347 (-56.34%)
Test#3 (Generic, ZIP)
44958
17275 (-61.58%)
Test#1 (Memory)
10054
3776 (-62.44%)
TOTAL
443765
189969 (-57.19%)

Performance/W
i7-8700k
i5-8265U
Test#1 (Integers)
2131 points/W
5838 points/W
Test#2 (FP)
1961 points/W
5423 points/W
Test#3 (Generic, ZIP)
473 points/W
1152 points/W
Test#1 (Memory)
106 points/W
252 points/W
TOTAL
4671 points/W
12665 points/W

Performance/GHz
i7-8700k
i5-8265U
Test#1 (Integers)
6639 points/GHz
6190 points/GHz
Test#2 (FP)
5919 points/GHz
5540 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1320 points/GHz
Test#1 (Memory)
3192 points/GHz
1943 points/GHz
TOTAL
17148 points/GHz
14992 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