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Core i7-8550U vs i7-7660U


Description
Both models i7-8550U and i7-7660U 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 i7-8550U gets a score of 166.1 k points while the i7-7660U gets 132.8 k points.

Summarizing, the i7-8550U is 1.3 times faster than the i7-7660U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
806ea
806e9
Core
Kaby Lake-R
Kaby Lake-U
Architecture
Base frecuency
1.8 GHz
2.5 GHz
Boost frecuency
4 GHz
4 GHz
Socket
BGA1356
BGA 1356
Cores/Threads
4/8
2/4
TDP
15 W
15 W
Cache L1 (d+i)
4x32+4x32 kB
2x32+2x32 kB
Cache L2
4x256 kB
2x256 kB
Cache L3
8192 kB
4096 kB
Date
August 2017
January 2017
Mean monothread perf.
64.2k points
57.46k points
Mean multithread perf.
166.12k points
132.81k points

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
i7-8550U
i7-7660U
Test#1 (Integers)
25.37k
22.46k (x0.89)
Test#2 (FP)
22.6k
19.29k (x0.85)
Test#3 (Generic, ZIP)
5.13k
4.77k (x0.93)
Test#1 (Memory)
11.1k
10.94k (x0.99)
TOTAL
64.2k
57.46k (x0.9)

Multithread

i7-8550U

i7-7660U
Test#1 (Integers)
72.82k
56.67k (x0.78)
Test#2 (FP)
71.71k
46.95k (x0.65)
Test#3 (Generic, ZIP)
17.35k
12.36k (x0.71)
Test#1 (Memory)
4.24k
16.84k (x3.97)
TOTAL
166.12k
132.81k (x0.8)

Performance/W
i7-8550U
i7-7660U
Test#1 (Integers)
4855 points/W
3778 points/W
Test#2 (FP)
4781 points/W
3130 points/W
Test#3 (Generic, ZIP)
1157 points/W
824 points/W
Test#1 (Memory)
282 points/W
1122 points/W
TOTAL
11075 points/W
8854 points/W

Performance/GHz
i7-8550U
i7-7660U
Test#1 (Integers)
6343 points/GHz
5614 points/GHz
Test#2 (FP)
5650 points/GHz
4823 points/GHz
Test#3 (Generic, ZIP)
1282 points/GHz
1193 points/GHz
Test#1 (Memory)
2774 points/GHz
2735 points/GHz
TOTAL
16049 points/GHz
14365 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