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Core i7-6600U vs i7-8550U


Description
The i7-6600U is based on Skylake architecture while the i7-8550U is based on Kaby Lake.

Using the multithread performance as a reference, the i7-6600U gets a score of 79.2 k points while the i7-8550U gets 166.1 k points.

Summarizing, the i7-8550U is 2.1 times faster than the i7-6600U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
406e3
806ea
Core
Skylake-U
Kaby Lake-R
Architecture
Base frecuency
2.6 GHz
1.8 GHz
Boost frecuency
3.4 GHz
4 GHz
Socket
BGA1356
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
8192 kB
Date
September 2015
August 2017
Mean monothread perf.
39.73k points
64.2k points
Mean multithread perf.
79.22k points
166.12k points

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
i7-6600U
i7-8550U
Test#1 (Integers)
2.75k
3.91k (x1.42)
Test#2 (FP)
12.23k
15.98k (x1.31)
Test#3 (Generic, ZIP)
3.9k
5.11k (x1.31)
Test#1 (Memory)
5.61k
11.05k (x1.97)
TOTAL
24.48k
36.05k (x1.47)

Multithread

i7-6600U

i7-8550U
Test#1 (Integers)
5.23k
11.76k (x2.25)
Test#2 (FP)
25k
50.15k (x2.01)
Test#3 (Generic, ZIP)
8.98k
16.76k (x1.87)
Test#1 (Memory)
4.73k
4.17k (x0.88)
TOTAL
43.95k
82.84k (x1.88)

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
i7-6600U
i7-8550U
Test#1 (Integers)
6.76k
12.93k (x1.91)
Test#2 (FP)
9.58k
20.59k (x2.15)
Test#3 (Generic, ZIP)
2.46k
5.41k (x2.2)
Test#1 (Memory)
4.18k
10.48k (x2.51)
TOTAL
22.99k
49.41k (x2.15)

Multithread

i7-6600U

i7-8550U
Test#1 (Integers)
14.37k
41.11k (x2.86)
Test#2 (FP)
23.79k
65.04k (x2.73)
Test#3 (Generic, ZIP)
5.71k
17.53k (x3.07)
Test#1 (Memory)
4.29k
4.22k (x0.98)
TOTAL
48.16k
127.9k (x2.66)

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
i7-6600U
i7-8550U
Test#1 (Integers)
8.49k
13.15k (x1.55)
Test#2 (FP)
10.92k
19.7k (x1.8)
Test#3 (Generic, ZIP)
2.76k
5.1k (x1.85)
Test#1 (Memory)
4.93k
9.21k (x1.87)
TOTAL
27.1k
47.16k (x1.74)

Multithread

i7-6600U

i7-8550U
Test#1 (Integers)
14.11k
34.13k (x2.42)
Test#2 (FP)
20.05k
53.79k (x2.68)
Test#3 (Generic, ZIP)
6.17k
13.91k (x2.25)
Test#1 (Memory)
4.73k
4.12k (x0.87)
TOTAL
45.05k
105.95k (x2.35)

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
i7-6600U
i7-8550U
Test#1 (Integers)
16.72k
25.37k (x1.52)
Test#2 (FP)
14.7k
22.6k (x1.54)
Test#3 (Generic, ZIP)
3.4k
5.13k (x1.51)
Test#1 (Memory)
4.9k
11.1k (x2.26)
TOTAL
39.73k
64.2k (x1.62)

Multithread

i7-6600U

i7-8550U
Test#1 (Integers)
33.41k
72.82k (x2.18)
Test#2 (FP)
31.66k
71.71k (x2.26)
Test#3 (Generic, ZIP)
8.18k
17.35k (x2.12)
Test#1 (Memory)
5.97k
4.24k (x0.71)
TOTAL
79.22k
166.12k (x2.1)

Performance/W
i7-6600U
i7-8550U
Test#1 (Integers)
2227 points/W
4855 points/W
Test#2 (FP)
2111 points/W
4781 points/W
Test#3 (Generic, ZIP)
546 points/W
1157 points/W
Test#1 (Memory)
398 points/W
282 points/W
TOTAL
5282 points/W
11075 points/W

Performance/GHz
i7-6600U
i7-8550U
Test#1 (Integers)
4919 points/GHz
6343 points/GHz
Test#2 (FP)
4325 points/GHz
5650 points/GHz
Test#3 (Generic, ZIP)
999 points/GHz
1282 points/GHz
Test#1 (Memory)
1441 points/GHz
2774 points/GHz
TOTAL
11684 points/GHz
16049 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