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Core i7-6700K vs i7-4790


Description
The i7-6700K is based on Skylake architecture while the i7-4790 is based on Haswell.

Using the multithread performance as a reference, the i7-6700K gets a score of 254.6 k points while the i7-4790 gets 173.9 k points.

Summarizing, the i7-6700K is 1.5 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-S
Haswell
Architecture
Base frecuency
4 GHz
3.6 GHz
Boost frecuency
4.2 GHz
4 GHz
Socket
LGA 1151
LGA 1150
Cores/Threads
4/8
4/8
TDP
95 W
84 W
Cache L1 (d+i)
4x32+4x32 kB
32+32 kB
Cache L2
256 kB
256 kB
Cache L3
8192 kB
8192 kB
Date
May 2015
May 2014
Mean monothread perf.
63.22k points
44.73k points
Mean multithread perf.
254.56k points
173.89k 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
i7-6700K
i7-4790
Test#1 (Integers)
4.07k
4.51k (x1.11)
Test#2 (FP)
16.62k
11.24k (x0.68)
Test#3 (Generic, ZIP)
5.23k
5.03k (x0.96)
Test#1 (Memory)
6.28k
5.02k (x0.8)
TOTAL
32.2k
25.8k (x0.8)

Multithread

i7-6700K

i7-4790
Test#1 (Integers)
16.37k
15.72k (x0.96)
Test#2 (FP)
77.34k
54.99k (x0.71)
Test#3 (Generic, ZIP)
25.65k
23.87k (x0.93)
Test#1 (Memory)
10.21k
5.48k (x0.54)
TOTAL
129.57k
100.06k (x0.77)

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
i7-6700K
i7-4790
Test#1 (Integers)
14.73k
13.52k (x0.92)
Test#2 (FP)
21.27k
11.94k (x0.56)
Test#3 (Generic, ZIP)
5.52k
4.96k (x0.9)
Test#1 (Memory)
6.32k
4.84k (x0.77)
TOTAL
47.84k
35.25k (x0.74)

Multithread

i7-6700K

i7-4790
Test#1 (Integers)
61.09k
54.7k (x0.9)
Test#2 (FP)
99.17k
52.41k (x0.53)
Test#3 (Generic, ZIP)
26.57k
24.5k (x0.92)
Test#1 (Memory)
10.26k
6.77k (x0.66)
TOTAL
197.09k
138.37k (x0.7)

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
i7-6700K
i7-4790
Test#1 (Integers)
25.78k
22.19k (x0.86)
Test#2 (FP)
23.08k
12.45k (x0.54)
Test#3 (Generic, ZIP)
5.32k
5.11k (x0.96)
Test#1 (Memory)
9.03k
4.98k (x0.55)
TOTAL
63.22k
44.73k (x0.71)

Multithread

i7-6700K

i7-4790
Test#1 (Integers)
112.83k
87.14k (x0.77)
Test#2 (FP)
106.86k
58k (x0.54)
Test#3 (Generic, ZIP)
25.76k
22.75k (x0.88)
Test#1 (Memory)
9.12k
6k (x0.66)
TOTAL
254.56k
173.89k (x0.68)

Performance/W
i7-6700K
i7-4790
Test#1 (Integers)
1188 points/W
1037 points/W
Test#2 (FP)
1125 points/W
691 points/W
Test#3 (Generic, ZIP)
271 points/W
271 points/W
Test#1 (Memory)
96 points/W
71 points/W
TOTAL
2680 points/W
2070 points/W

Performance/GHz
i7-6700K
i7-4790
Test#1 (Integers)
6139 points/GHz
5547 points/GHz
Test#2 (FP)
5495 points/GHz
3113 points/GHz
Test#3 (Generic, ZIP)
1268 points/GHz
1279 points/GHz
Test#1 (Memory)
2150 points/GHz
1244 points/GHz
TOTAL
15052 points/GHz
11183 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. 3.11.4