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Core i7-6820HQ vs i5-6400


Description
Both models i7-6820HQ and i5-6400 are based on Skylake architecture.

Sky Lake is also known as 6th generation Core. Include Thunderbolt 3.0, SATA Express and Iris Pro graphics with DirectX 12. It uses LGA 1151 socket for mainstream models and LGA 2066 for X-Series. Sky Lake comes with AVX2 support in all mainstreams CPUs and AVX-512 in some high end models.

Using the multithread performance as a reference, the i7-6820HQ gets a score of 206.3 k points while the i5-6400 gets 176.7 k points.

Summarizing, the i7-6820HQ is 1.2 times faster than the i5-6400 . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
506e3
506e3
Core
Skylake-H
Skylake-S
Architecture
Base frecuency
2.7 GHz
2.7 GHz
Boost frecuency
3.6 GHz
3.3 GHz
Socket
BGA1440
LGA 1151
Cores/Threads
4/8
4/4
TDP
45 W
65 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
September 2015

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
i5-6400
Test#1 (Integers)
3180
3185 (0.16%)
Test#2 (FP)
13020
12581 (-3.37%)
Test#3 (Generic, ZIP)
4169
4105 (-1.53%)
Test#1 (Memory)
6931
3934 (-43.24%)
TOTAL
27299
23805 (-12.80%)

Multithread

i7-6820HQ

i5-6400
Test#1 (Integers)
13259
10777 (-18.72%)
Test#2 (FP)
62228
44113 (-29.11%)
Test#3 (Generic, ZIP)
20342
13887 (-31.74%)
Test#1 (Memory)
5464
7829 (43.30%)
TOTAL
101292
76606 (-24.37%)

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
i5-6400
Test#1 (Integers)
11536
11411 (-1.08%)
Test#2 (FP)
16687
16352 (-2.01%)
Test#3 (Generic, ZIP)
4514
4146 (-8.16%)
Test#1 (Memory)
7273
3277 (-54.95%)
TOTAL
40011
35186 (-12.06%)

Multithread

i7-6820HQ

i5-6400
Test#1 (Integers)
48501
41474 (-14.49%)
Test#2 (FP)
77016
65462 (-15.00%)
Test#3 (Generic, ZIP)
21301
16202 (-23.94%)
Test#1 (Memory)
5242
7660 (46.13%)
TOTAL
152060
130798 (-13.98%)

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
i5-6400
Test#1 (Integers)
11784
11824 (0.34%)
Test#2 (FP)
18056
18358 (1.67%)
Test#3 (Generic, ZIP)
4479
4426 (-1.20%)
Test#1 (Memory)
7117
4950 (-30.45%)
TOTAL
41437
39558 (-4.53%)

Multithread

i7-6820HQ

i5-6400
Test#1 (Integers)
49458
46044 (-6.90%)
Test#2 (FP)
84798
69468 (-18.08%)
Test#3 (Generic, ZIP)
20703
16330 (-21.12%)
Test#1 (Memory)
4770
7742 (62.29%)
TOTAL
159730
139584 (-12.61%)

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
i5-6400
Test#1 (Integers)
21147
21213 (0.31%)
Test#2 (FP)
18663
18149 (-2.75%)
Test#3 (Generic, ZIP)
4359
4213 (-3.36%)
Test#1 (Memory)
6240
4304 (-31.03%)
TOTAL
50409
47879 (-5.02%)

Multithread

i7-6820HQ

i5-6400
Test#1 (Integers)
91901
80359 (-12.56%)
Test#2 (FP)
87330
71943 (-17.62%)
Test#3 (Generic, ZIP)
20715
16375 (-20.95%)
Test#1 (Memory)
6325
8054 (27.32%)
TOTAL
206271
176731 (-14.32%)

Performance/W
i7-6820HQ
i5-6400
Test#1 (Integers)
2042 points/W
1236 points/W
Test#2 (FP)
1941 points/W
1107 points/W
Test#3 (Generic, ZIP)
460 points/W
252 points/W
Test#1 (Memory)
141 points/W
124 points/W
TOTAL
4584 points/W
2719 points/W

Performance/GHz
i7-6820HQ
i5-6400
Test#1 (Integers)
5874 points/GHz
6428 points/GHz
Test#2 (FP)
5184 points/GHz
5500 points/GHz
Test#3 (Generic, ZIP)
1211 points/GHz
1277 points/GHz
Test#1 (Memory)
1733 points/GHz
1304 points/GHz
TOTAL
14002 points/GHz
14509 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