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Core i7-6820HQ vs i5-8250U


Description
The i7-6820HQ is based on Skylake architecture while the i5-8250U is based on Kaby Lake.

Using the multithread performance as a reference, the i7-6820HQ gets a score of 206.3 k points while the i5-8250U gets 175.5 k points.

Summarizing, the i7-6820HQ is 1.2 times faster than the i5-8250U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
506e3
806ea
Core
Skylake-H
Kaby Lake-R
Architecture
Base frecuency
2.7 GHz
1.6 GHz
Boost frecuency
3.6 GHz
3.4 GHz
Socket
BGA1440
BGA1356
Cores/Threads
4/8
4/8
TDP
45 W
15 W
Cache L1 (d+i)
4x32+4x32 kB
4x32+4x32 kB
Cache L2
4x256 kB
4x256 kB
Cache L3
8192 kB
6144 kB
Date
October 2015
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
i7-6820HQ
i5-8250U
Test#1 (Integers)
3180
3322 (4.47%)
Test#2 (FP)
13020
13499 (3.68%)
Test#3 (Generic, ZIP)
4169
4105 (-1.53%)
Test#1 (Memory)
6931
7416 (7.00%)
TOTAL
27299
28342 (3.82%)

Multithread

i7-6820HQ

i5-8250U
Test#1 (Integers)
13259
13969 (5.36%)
Test#2 (FP)
62228
50797 (-18.37%)
Test#3 (Generic, ZIP)
20342
14713 (-27.68%)
Test#1 (Memory)
5464
4763 (-12.82%)
TOTAL
101292
84242 (-16.83%)

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
i7-6820HQ
i5-8250U
Test#1 (Integers)
11536
12410 (7.57%)
Test#2 (FP)
16687
18112 (8.54%)
Test#3 (Generic, ZIP)
4514
4785 (6.00%)
Test#1 (Memory)
7273
8157 (12.15%)
TOTAL
40011
43464 (8.63%)

Multithread

i7-6820HQ

i5-8250U
Test#1 (Integers)
48501
42479 (-12.42%)
Test#2 (FP)
77016
60203 (-21.83%)
Test#3 (Generic, ZIP)
21301
14850 (-30.28%)
Test#1 (Memory)
5242
4770 (-9.01%)
TOTAL
152060
122301 (-19.57%)

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
i7-6820HQ
i5-8250U
Test#1 (Integers)
11784
12588 (6.82%)
Test#2 (FP)
18056
18890 (4.62%)
Test#3 (Generic, ZIP)
4479
4648 (3.77%)
Test#1 (Memory)
7117
8197 (15.17%)
TOTAL
41437
44322 (6.96%)

Multithread

i7-6820HQ

i5-8250U
Test#1 (Integers)
49458
45911 (-7.17%)
Test#2 (FP)
84798
69550 (-17.98%)
Test#3 (Generic, ZIP)
20703
16795 (-18.88%)
Test#1 (Memory)
4770
4830 (1.26%)
TOTAL
159730
137086 (-14.18%)

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
i7-6820HQ
i5-8250U
Test#1 (Integers)
21147
22344 (5.66%)
Test#2 (FP)
18663
19625 (5.16%)
Test#3 (Generic, ZIP)
4359
4702 (7.85%)
Test#1 (Memory)
6240
8458 (35.55%)
TOTAL
50409
55128 (9.36%)

Multithread

i7-6820HQ

i5-8250U
Test#1 (Integers)
91901
83350 (-9.31%)
Test#2 (FP)
87330
71044 (-18.65%)
Test#3 (Generic, ZIP)
20715
16215 (-21.72%)
Test#1 (Memory)
6325
4846 (-23.39%)
TOTAL
206271
175455 (-14.94%)

Performance/W
i7-6820HQ
i5-8250U
Test#1 (Integers)
2042 points/W
5557 points/W
Test#2 (FP)
1941 points/W
4736 points/W
Test#3 (Generic, ZIP)
460 points/W
1081 points/W
Test#1 (Memory)
141 points/W
323 points/W
TOTAL
4584 points/W
11697 points/W

Performance/GHz
i7-6820HQ
i5-8250U
Test#1 (Integers)
5874 points/GHz
6572 points/GHz
Test#2 (FP)
5184 points/GHz
5772 points/GHz
Test#3 (Generic, ZIP)
1211 points/GHz
1383 points/GHz
Test#1 (Memory)
1733 points/GHz
2488 points/GHz
TOTAL
14002 points/GHz
16214 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