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Core i7-7660U vs i5-8250U


Description
Both models i7-7660U and i5-8250U 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 i7-7660U gets a score of 132.8 k points while the i5-8250U gets 161.3 k points.

Summarizing, the i5-8250U is 1.2 times faster than the i7-7660U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
806e9
806ea
Core
Kaby Lake-U
Kaby Lake-R
Architecture
Base frecuency
2.5 GHz
1.6 GHz
Boost frecuency
4 GHz
3.4 GHz
Socket
BGA 1356
BGA1356
Cores/Threads
2/4
4/8
TDP
15 W
15 W
Cache L1 (d+i)
2x32+2x32 kB
4x32+4x32 kB
Cache L2
2x256 kB
4x256 kB
Cache L3
4096 kB
6144 kB
Date
January 2017
August 2017
Mean monothread perf.
57.46k points
54.31k points
Mean multithread perf.
132.81k points
161.26k 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
i7-7660U
i5-8250U
Test#1 (Integers)
22.46k
22.11k (x0.98)
Test#2 (FP)
19.29k
19.64k (x1.02)
Test#3 (Generic, ZIP)
4.77k
4.54k (x0.95)
Test#1 (Memory)
10.94k
8.03k (x0.73)
TOTAL
57.46k
54.31k (x0.95)

Multithread

i7-7660U

i5-8250U
Test#1 (Integers)
56.67k
74.19k (x1.31)
Test#2 (FP)
46.95k
66.27k (x1.41)
Test#3 (Generic, ZIP)
12.36k
15.97k (x1.29)
Test#1 (Memory)
16.84k
4.83k (x0.29)
TOTAL
132.81k
161.26k (x1.21)

Performance/W
i7-7660U
i5-8250U
Test#1 (Integers)
3778 points/W
4946 points/W
Test#2 (FP)
3130 points/W
4418 points/W
Test#3 (Generic, ZIP)
824 points/W
1065 points/W
Test#1 (Memory)
1122 points/W
322 points/W
TOTAL
8854 points/W
10751 points/W

Performance/GHz
i7-7660U
i5-8250U
Test#1 (Integers)
5614 points/GHz
6503 points/GHz
Test#2 (FP)
4823 points/GHz
5777 points/GHz
Test#3 (Generic, ZIP)
1193 points/GHz
1334 points/GHz
Test#1 (Memory)
2735 points/GHz
2361 points/GHz
TOTAL
14365 points/GHz
15975 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