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Core i7-6820HQ vs i7-4790K


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

Using the multithread performance as a reference, the i7-6820HQ gets a score of 206.3 k points while the i7-4790K gets 219.5 k points.

Summarizing, the i7-4790K is 1.1 times faster than the i7-6820HQ. 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
4 GHz
Boost frecuency
3.6 GHz
4.4 GHz
Socket
BGA1440
LGA 1150
Cores/Threads
4/8
4/8
TDP
45 W
88 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
i7-4790K
Test#1 (Integers)
3180
5065 (59.27%)
Test#2 (FP)
13020
12626 (-3.03%)
Test#3 (Generic, ZIP)
4169
5815 (39.47%)
Test#1 (Memory)
6931
4963 (-28.39%)
TOTAL
27299
28468 (4.28%)

Multithread

i7-6820HQ

i7-4790K
Test#1 (Integers)
13259
18283 (37.89%)
Test#2 (FP)
62228
64071 (2.96%)
Test#3 (Generic, ZIP)
20342
27522 (35.29%)
Test#1 (Memory)
5464
7970 (45.87%)
TOTAL
101292
117844 (16.34%)

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
i7-4790K
Test#1 (Integers)
11536
15603 (35.25%)
Test#2 (FP)
16687
13919 (-16.59%)
Test#3 (Generic, ZIP)
4514
6125 (35.67%)
Test#1 (Memory)
7273
5001 (-31.24%)
TOTAL
40011
40647 (1.59%)

Multithread

i7-6820HQ

i7-4790K
Test#1 (Integers)
48501
65477 (35.00%)
Test#2 (FP)
77016
63290 (-17.82%)
Test#3 (Generic, ZIP)
21301
27929 (31.12%)
Test#1 (Memory)
5242
7841 (49.58%)
TOTAL
152060
164537 (8.21%)

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
i7-4790K
Test#1 (Integers)
11784
15800 (34.08%)
Test#2 (FP)
18056
14346 (-20.55%)
Test#3 (Generic, ZIP)
4479
5974 (33.36%)
Test#1 (Memory)
7117
5166 (-27.42%)
TOTAL
41437
41285 (-0.37%)

Multithread

i7-6820HQ

i7-4790K
Test#1 (Integers)
49458
62785 (26.95%)
Test#2 (FP)
84798
66483 (-21.60%)
Test#3 (Generic, ZIP)
20703
26352 (27.29%)
Test#1 (Memory)
4770
8739 (83.19%)
TOTAL
159730
164359 (2.90%)

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
i7-4790K
Test#1 (Integers)
21147
26714 (26.33%)
Test#2 (FP)
18663
15101 (-19.09%)
Test#3 (Generic, ZIP)
4359
6186 (41.90%)
Test#1 (Memory)
6240
5554 (-10.99%)
TOTAL
50409
53555 (6.24%)

Multithread

i7-6820HQ

i7-4790K
Test#1 (Integers)
91901
109572 (19.23%)
Test#2 (FP)
87330
71887 (-17.68%)
Test#3 (Generic, ZIP)
20715
28440 (37.30%)
Test#1 (Memory)
6325
9603 (51.82%)
TOTAL
206271
219503 (6.42%)

Performance/W
i7-6820HQ
i7-4790K
Test#1 (Integers)
2042 points/W
1245 points/W
Test#2 (FP)
1941 points/W
817 points/W
Test#3 (Generic, ZIP)
460 points/W
323 points/W
Test#1 (Memory)
141 points/W
109 points/W
TOTAL
4584 points/W
2494 points/W

Performance/GHz
i7-6820HQ
i7-4790K
Test#1 (Integers)
5874 points/GHz
6071 points/GHz
Test#2 (FP)
5184 points/GHz
3432 points/GHz
Test#3 (Generic, ZIP)
1211 points/GHz
1406 points/GHz
Test#1 (Memory)
1733 points/GHz
1262 points/GHz
TOTAL
14002 points/GHz
12172 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