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Core i5-8250U vs i7-8550U


Description
Both models i5-8250U and i7-8550U are based on Kaby Lake architecture.

The first Kaby Lake CPU was released in August 2016. It uses a 14 nm process and was the first architecture in breaking the previous tick-tock model. Actually, it is not that different from the preceding Skylake: it has 64kB of L1 cache and 256kB L2 cache per core.

Using the multithread performance as a reference, the i5-8250U gets a score of 175.5 k points while the i7-8550U gets 169.9 k points.

Summarizing, the i5-8250U is 1 times faster than the i7-8550U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
806ea
806ea
Core
Kaby Lake-R
Kaby Lake-R
Architecture
Base frecuency
1.6 GHz
1.8 GHz
Boost frecuency
3.4 GHz
4 GHz
Socket
BGA1356
BGA1356
Cores/Threads
4/8
4/8
TDP
15 W
15 W
Cache L1 (d+i)
4x32+4x32 kB
4x32+4x32 kB
Cache L2
4x256 kB
4x256 kB
Cache L3
6144 kB
8192 kB
Date
August 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
i5-8250U
i7-8550U
Test#1 (Integers)
3322
3911 (17.75%)
Test#2 (FP)
13499
15977 (18.36%)
Test#3 (Generic, ZIP)
4105
5112 (24.54%)
Test#1 (Memory)
7416
11046 (48.95%)
TOTAL
28342
36047 (27.18%)

Multithread

i5-8250U

i7-8550U
Test#1 (Integers)
13969
11761 (-15.81%)
Test#2 (FP)
50797
50154 (-1.27%)
Test#3 (Generic, ZIP)
14713
16756 (13.89%)
Test#1 (Memory)
4763
4166 (-12.53%)
TOTAL
84242
82837 (-1.67%)

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
i7-8550U
Test#1 (Integers)
12410
12928 (4.17%)
Test#2 (FP)
18112
20589 (13.68%)
Test#3 (Generic, ZIP)
4785
5410 (13.06%)
Test#1 (Memory)
8157
10479 (28.47%)
TOTAL
43464
49406 (13.67%)

Multithread

i5-8250U

i7-8550U
Test#1 (Integers)
42479
41109 (-3.23%)
Test#2 (FP)
60203
65038 (8.03%)
Test#3 (Generic, ZIP)
14850
17532 (18.06%)
Test#1 (Memory)
4770
4222 (-11.48%)
TOTAL
122301
127900 (4.58%)

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
i5-8250U
i7-8550U
Test#1 (Integers)
12588
13153 (4.49%)
Test#2 (FP)
18890
19696 (4.27%)
Test#3 (Generic, ZIP)
4648
5101 (9.75%)
Test#1 (Memory)
8197
9213 (12.40%)
TOTAL
44322
47162 (6.41%)

Multithread

i5-8250U

i7-8550U
Test#1 (Integers)
45911
34130 (-25.66%)
Test#2 (FP)
69550
53788 (-22.66%)
Test#3 (Generic, ZIP)
16795
13906 (-17.20%)
Test#1 (Memory)
4830
4125 (-14.61%)
TOTAL
137086
105948 (-22.71%)

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
i7-8550U
Test#1 (Integers)
22344
25859 (15.73%)
Test#2 (FP)
19625
23009 (17.24%)
Test#3 (Generic, ZIP)
4702
5225 (11.12%)
Test#1 (Memory)
8458
11503 (35.99%)
TOTAL
55128
65595 (18.98%)

Multithread

i5-8250U

i7-8550U
Test#1 (Integers)
83350
74572 (-10.53%)
Test#2 (FP)
71044
73316 (3.20%)
Test#3 (Generic, ZIP)
16215
17857 (10.13%)
Test#1 (Memory)
4846
4203 (-13.27%)
TOTAL
175455
169947 (-3.14%)

Performance/W
i5-8250U
i7-8550U
Test#1 (Integers)
5557 points/W
4971 points/W
Test#2 (FP)
4736 points/W
4888 points/W
Test#3 (Generic, ZIP)
1081 points/W
1190 points/W
Test#1 (Memory)
323 points/W
280 points/W
TOTAL
11697 points/W
11330 points/W

Performance/GHz
i5-8250U
i7-8550U
Test#1 (Integers)
6572 points/GHz
6465 points/GHz
Test#2 (FP)
5772 points/GHz
5752 points/GHz
Test#3 (Generic, ZIP)
1383 points/GHz
1306 points/GHz
Test#1 (Memory)
2488 points/GHz
2876 points/GHz
TOTAL
16214 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. 3.7.8