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Core i7-8700k vs i7-8550U


Description
The i7-8700k is based on Coffee Lake architecture while the i7-8550U 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 i7-8550U gets 169.9 k points.

Summarizing, the i7-8700k is 2.6 times faster than the i7-8550U. 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
1.8 GHz
Boost frecuency
4.7 GHz
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
8192 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
i7-8550U
Test#1 (Integers)
4127
3911 (-5.22%)
Test#2 (FP)
16959
15977 (-5.79%)
Test#3 (Generic, ZIP)
5564
5112 (-8.12%)
Test#1 (Memory)
12845
11046 (-14.01%)
TOTAL
39495
36047 (-8.73%)

Multithread

i7-8700k

i7-8550U
Test#1 (Integers)
24011
11761 (-51.02%)
Test#2 (FP)
108690
50154 (-53.86%)
Test#3 (Generic, ZIP)
36616
16756 (-54.24%)
Test#1 (Memory)
9327
4166 (-55.33%)
TOTAL
178644
82837 (-53.63%)

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
i7-8550U
Test#1 (Integers)
12920
12928 (0.06%)
Test#2 (FP)
20678
20589 (-0.43%)
Test#3 (Generic, ZIP)
5295
5410 (2.17%)
Test#1 (Memory)
12587
10479 (-16.75%)
TOTAL
51480
49406 (-4.03%)

Multithread

i7-8700k

i7-8550U
Test#1 (Integers)
94259
41109 (-56.39%)
Test#2 (FP)
152549
65038 (-57.37%)
Test#3 (Generic, ZIP)
39735
17532 (-55.88%)
Test#1 (Memory)
8527
4222 (-50.49%)
TOTAL
295071
127900 (-56.65%)

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
i7-8550U
Test#1 (Integers)
16874
13153 (-22.05%)
Test#2 (FP)
26119
19696 (-24.59%)
Test#3 (Generic, ZIP)
6329
5101 (-19.40%)
Test#1 (Memory)
13708
9213 (-32.80%)
TOTAL
63030
47162 (-25.17%)

Multithread

i7-8700k

i7-8550U
Test#1 (Integers)
105740
34130 (-67.72%)
Test#2 (FP)
180520
53788 (-70.20%)
Test#3 (Generic, ZIP)
44994
13906 (-69.09%)
Test#1 (Memory)
8512
4125 (-51.54%)
TOTAL
339766
105948 (-68.82%)

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
i7-8550U
Test#1 (Integers)
31204
25859 (-17.13%)
Test#2 (FP)
27821
23009 (-17.30%)
Test#3 (Generic, ZIP)
6568
5225 (-20.45%)
Test#1 (Memory)
15004
11503 (-23.34%)
TOTAL
80598
65595 (-18.61%)

Multithread

i7-8700k

i7-8550U
Test#1 (Integers)
202422
74572 (-63.16%)
Test#2 (FP)
186332
73316 (-60.65%)
Test#3 (Generic, ZIP)
44958
17857 (-60.28%)
Test#1 (Memory)
10054
4203 (-58.19%)
TOTAL
443765
169947 (-61.70%)

Performance/W
i7-8700k
i7-8550U
Test#1 (Integers)
2131 points/W
4971 points/W
Test#2 (FP)
1961 points/W
4888 points/W
Test#3 (Generic, ZIP)
473 points/W
1190 points/W
Test#1 (Memory)
106 points/W
280 points/W
TOTAL
4671 points/W
11330 points/W

Performance/GHz
i7-8700k
i7-8550U
Test#1 (Integers)
6639 points/GHz
6465 points/GHz
Test#2 (FP)
5919 points/GHz
5752 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
1306 points/GHz
Test#1 (Memory)
3192 points/GHz
2876 points/GHz
TOTAL
17148 points/GHz
16399 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