Core i5-6400 vs i7-6820HQ
Description
Both models i5-6400 and i7-6820HQ 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 i5-6400 gets a score of 174.1 k points while the i7-6820HQ gets 205.9 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.
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 i5-6400 gets a score of 174.1 k points while the i7-6820HQ gets 205.9 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-S
Skylake-H
Base frecuency
2.7 GHz
2.7 GHz
Boost frecuency
3.3 GHz
3.6 GHz
Socket
LGA 1151
BGA1440
Cores/Threads
4/4
4/8
TDP
65 W
45 W
Cache L1 (d+i)
4x32+4x32 kB
4x32+4x32 kB
Cache L2
4x256 kB
4x256 kB
Cache L3
6144 kB
8192 kB
Date
September 2015
October 2015
Mean monothread perf.
48.05k points
50.1k points
Mean multithread perf.
174.05k points
205.89k 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
i5-6400
i7-6820HQ
Test#1 (Integers)
3.2k
3.18k (x0.99)
Test#2 (FP)
12.81k
13.02k (x1.02)
Test#3 (Generic, ZIP)
4.18k
4.17k (x1)
Test#1 (Memory)
4.3k
6.93k (x1.61)
TOTAL
24.49k
27.3k (x1.11)
Multithread
i5-6400
i7-6820HQ
Test#1 (Integers)
11.45k
13.26k (x1.16)
Test#2 (FP)
46.67k
62.23k (x1.33)
Test#3 (Generic, ZIP)
14.69k
20.34k (x1.38)
Test#1 (Memory)
5.92k
5.46k (x0.92)
TOTAL
78.73k
101.29k (x1.29)
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
i5-6400
i7-6820HQ
Test#1 (Integers)
11.56k
11.54k (x1)
Test#2 (FP)
16.53k
16.69k (x1.01)
Test#3 (Generic, ZIP)
4.3k
4.51k (x1.05)
Test#1 (Memory)
3.97k
7.27k (x1.83)
TOTAL
36.36k
40.01k (x1.1)
Multithread
i5-6400
i7-6820HQ
Test#1 (Integers)
43.01k
48.5k (x1.13)
Test#2 (FP)
64.46k
77.02k (x1.19)
Test#3 (Generic, ZIP)
16.14k
21.3k (x1.32)
Test#1 (Memory)
5.91k
5.24k (x0.89)
TOTAL
129.51k
152.06k (x1.17)
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
i5-6400
i7-6820HQ
Test#1 (Integers)
11.82k
11.78k (x1)
Test#2 (FP)
18.36k
18.06k (x0.98)
Test#3 (Generic, ZIP)
4.43k
4.48k (x1.01)
Test#1 (Memory)
4.95k
7.12k (x1.44)
TOTAL
39.56k
41.44k (x1.05)
Multithread
i5-6400
i7-6820HQ
Test#1 (Integers)
46.04k
49.46k (x1.07)
Test#2 (FP)
69.47k
84.8k (x1.22)
Test#3 (Generic, ZIP)
16.33k
20.7k (x1.27)
Test#1 (Memory)
7.74k
4.77k (x0.62)
TOTAL
139.58k
159.73k (x1.14)
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
i5-6400
i7-6820HQ
Test#1 (Integers)
21.1k
20.99k (x0.99)
Test#2 (FP)
18.28k
18.63k (x1.02)
Test#3 (Generic, ZIP)
4.22k
4.33k (x1.03)
Test#1 (Memory)
4.45k
6.15k (x1.38)
TOTAL
48.05k
50.1k (x1.04)
Multithread
i5-6400
i7-6820HQ
Test#1 (Integers)
80.03k
91.8k (x1.15)
Test#2 (FP)
71.1k
87.24k (x1.23)
Test#3 (Generic, ZIP)
16.19k
20.55k (x1.27)
Test#1 (Memory)
6.73k
6.3k (x0.94)
TOTAL
174.05k
205.89k (x1.18)
Performance/W
i5-6400
i7-6820HQ
Test#1 (Integers)
1231 points/W
2040 points/W
Test#2 (FP)
1094 points/W
1939 points/W
Test#3 (Generic, ZIP)
249 points/W
457 points/W
Test#1 (Memory)
104 points/W
140 points/W
TOTAL
2678 points/W
4575 points/W
Performance/GHz
i5-6400
i7-6820HQ
Test#1 (Integers)
6394 points/GHz
5831 points/GHz
Test#2 (FP)
5539 points/GHz
5174 points/GHz
Test#3 (Generic, ZIP)
1279 points/GHz
1204 points/GHz
Test#1 (Memory)
1348 points/GHz
1708 points/GHz
TOTAL
14560 points/GHz
13917 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.
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]
Test#2 (FP) [points vs time]
Test#3 (Generic, ZIP) [points vs time]
Test#1 (Memory) [points vs time]
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.
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]
Test#2 (FP) [points vs time]
Test#3 (Generic, ZIP) [points vs time]
Test#1 (Memory) [points vs time]
Hardlimit Benchmark Central - Ver. 3.11.4