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Core i7-6820HQ vs i7-4790


Description
The i7-6820HQ is based on Skylake architecture while the i7-4790 is based on Haswell.

Using the multithread performance as a reference, the i7-6820HQ gets a score of 206.3 k points while the i7-4790 gets 191.7 k points.

Summarizing, the i7-6820HQ is 1.1 times faster than the i7-4790 . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
506e3
306c3
Core
Skylake-H
Haswell
Architecture
Base frecuency
2.7 GHz
3.6 GHz
Boost frecuency
3.6 GHz
4 GHz
Socket
BGA1440
LGA 1150
Cores/Threads
4/8
4/8
TDP
45 W
84 W
Cache L1 (d+i)
4x32+4x32 kB
32+32 kB
Cache L2
4x256 kB
256 kB
Cache L3
8192 kB
8192 kB
Date
October 2015
May 2014

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
i7-4790
Test#1 (Integers)
3180
4532 (42.53%)
Test#2 (FP)
13020
11241 (-13.66%)
Test#3 (Generic, ZIP)
4169
5068 (21.56%)
Test#1 (Memory)
6931
4640 (-33.06%)
TOTAL
27299
25481 (-6.66%)

Multithread

i7-6820HQ

i7-4790
Test#1 (Integers)
13259
15772 (18.96%)
Test#2 (FP)
62228
55237 (-11.23%)
Test#3 (Generic, ZIP)
20342
24154 (18.74%)
Test#1 (Memory)
5464
5759 (5.40%)
TOTAL
101292
100923 (-0.36%)

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
i7-4790
Test#1 (Integers)
11536
13619 (18.05%)
Test#2 (FP)
16687
12112 (-27.42%)
Test#3 (Generic, ZIP)
4514
5259 (16.50%)
Test#1 (Memory)
7273
4575 (-37.10%)
TOTAL
40011
35565 (-11.11%)

Multithread

i7-6820HQ

i7-4790
Test#1 (Integers)
48501
56096 (15.66%)
Test#2 (FP)
77016
55018 (-28.56%)
Test#3 (Generic, ZIP)
21301
24955 (17.15%)
Test#1 (Memory)
5242
6598 (25.86%)
TOTAL
152060
142666 (-6.18%)

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
i7-4790
Test#1 (Integers)
11784
13992 (18.73%)
Test#2 (FP)
18056
12853 (-28.82%)
Test#3 (Generic, ZIP)
4479
5373 (19.94%)
Test#1 (Memory)
7117
4910 (-31.01%)
TOTAL
41437
37128 (-10.40%)

Multithread

i7-6820HQ

i7-4790
Test#1 (Integers)
49458
57834 (16.93%)
Test#2 (FP)
84798
61912 (-26.99%)
Test#3 (Generic, ZIP)
20703
24422 (17.96%)
Test#1 (Memory)
4770
7361 (54.31%)
TOTAL
159730
151529 (-5.13%)

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
i7-4790
Test#1 (Integers)
21147
23288 (10.13%)
Test#2 (FP)
18663
12577 (-32.61%)
Test#3 (Generic, ZIP)
4359
5408 (24.05%)
Test#1 (Memory)
6240
4995 (-19.96%)
TOTAL
50409
46268 (-8.21%)

Multithread

i7-6820HQ

i7-4790
Test#1 (Integers)
91901
96887 (5.42%)
Test#2 (FP)
87330
62902 (-27.97%)
Test#3 (Generic, ZIP)
20715
25201 (21.66%)
Test#1 (Memory)
6325
6741 (6.57%)
TOTAL
206271
191731 (-7.05%)

Performance/W
i7-6820HQ
i7-4790
Test#1 (Integers)
2042 points/W
1153 points/W
Test#2 (FP)
1941 points/W
749 points/W
Test#3 (Generic, ZIP)
460 points/W
300 points/W
Test#1 (Memory)
141 points/W
80 points/W
TOTAL
4584 points/W
2283 points/W

Performance/GHz
i7-6820HQ
i7-4790
Test#1 (Integers)
5874 points/GHz
5822 points/GHz
Test#2 (FP)
5184 points/GHz
3144 points/GHz
Test#3 (Generic, ZIP)
1211 points/GHz
1352 points/GHz
Test#1 (Memory)
1733 points/GHz
1249 points/GHz
TOTAL
14002 points/GHz
11567 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