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Ryzen 9 3900 vs Core i7-6700K


Description
The 3900 is based on Zen 2 architecture while the i7-6700K is based on Skylake.

Using the multithread performance as a reference, the 3900 gets a score of 687.5 k points while the i7-6700K gets 254.6 k points.

Summarizing, the 3900 is 2.7 times faster than the i7-6700K . To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
870f10
506e3
Core
Matisse
Skylake-S
Architecture
Base frecuency
3.1 GHz
4 GHz
Boost frecuency
4.3 GHz
4.2 GHz
Socket
AM4
LGA 1151
Cores/Threads
12/24
4/8
TDP
65 W
95 W
Cache L1 (d+i)
12x32+12x32 kB
4x32+4x32 kB
Cache L2
12x512 kB
256 kB
Cache L3
4x16384 kB
8192 kB
Date
September 2019
May 2015
Mean monothread perf.
74.97k points
63.22k points
Mean multithread perf.
687.5k points
254.56k 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
3900
i7-6700K
Test#1 (Integers)
4.39k
4.07k (x0.93)
Test#2 (FP)
16.99k
16.62k (x0.98)
Test#3 (Generic, ZIP)
7.74k
5.23k (x0.67)
Test#1 (Memory)
24.57k
6.28k (x0.26)
TOTAL
53.69k
32.2k (x0.6)

Multithread

3900

i7-6700K
Test#1 (Integers)
48.45k
16.37k (x0.34)
Test#2 (FP)
230.81k
77.34k (x0.34)
Test#3 (Generic, ZIP)
122.82k
25.65k (x0.21)
Test#1 (Memory)
54.73k
10.21k (x0.19)
TOTAL
456.8k
129.57k (x0.28)

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
3900
i7-6700K
Test#1 (Integers)
16.59k
14.73k (x0.89)
Test#2 (FP)
24.55k
21.27k (x0.87)
Test#3 (Generic, ZIP)
8.55k
5.52k (x0.65)
Test#1 (Memory)
26.28k
6.32k (x0.24)
TOTAL
75.97k
47.84k (x0.63)

Multithread

3900

i7-6700K
Test#1 (Integers)
181.33k
61.09k (x0.34)
Test#2 (FP)
261.01k
99.17k (x0.38)
Test#3 (Generic, ZIP)
126.62k
26.57k (x0.21)
Test#1 (Memory)
66.64k
10.26k (x0.15)
TOTAL
635.6k
197.09k (x0.31)

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
3900
i7-6700K
Test#1 (Integers)
16.85k
25.78k (x1.53)
Test#2 (FP)
26.03k
23.08k (x0.89)
Test#3 (Generic, ZIP)
9.54k
5.32k (x0.56)
Test#1 (Memory)
22.55k
9.03k (x0.4)
TOTAL
74.97k
63.22k (x0.84)

Multithread

3900

i7-6700K
Test#1 (Integers)
229.41k
112.83k (x0.49)
Test#2 (FP)
292.81k
106.86k (x0.36)
Test#3 (Generic, ZIP)
128.48k
25.76k (x0.2)
Test#1 (Memory)
36.8k
9.12k (x0.25)
TOTAL
687.5k
254.56k (x0.37)

Performance/W
3900
i7-6700K
Test#1 (Integers)
3529 points/W
1188 points/W
Test#2 (FP)
4505 points/W
1125 points/W
Test#3 (Generic, ZIP)
1977 points/W
271 points/W
Test#1 (Memory)
566 points/W
96 points/W
TOTAL
10577 points/W
2680 points/W

Performance/GHz
3900
i7-6700K
Test#1 (Integers)
3920 points/GHz
6139 points/GHz
Test#2 (FP)
6054 points/GHz
5495 points/GHz
Test#3 (Generic, ZIP)
2218 points/GHz
1268 points/GHz
Test#1 (Memory)
5243 points/GHz
2150 points/GHz
TOTAL
17435 points/GHz
15052 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