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Core i7-8700k vs Ryzen 9 3900


Description
The i7-8700k is based on Coffee Lake architecture while the 3900 is based on Zen 2.

Using the multithread performance as a reference, the i7-8700k gets a score of 443.8 k points while the 3900 gets 687.5 k points.

Summarizing, the 3900 is 1.5 times faster than the i7-8700k. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
906ea
870f10
Core
Coffee Lake-S
Matisse
Architecture
Base frecuency
3.7 GHz
3.1 GHz
Boost frecuency
4.7 GHz
4.3 GHz
Socket
LGA 1151
AM4
Cores/Threads
6/12
12/24
TDP
95 W
65 W
Cache L1 (d+i)
6x32+6x32 kB
12x32+12x32 kB
Cache L2
6x256 kB
12x512 kB
Cache L3
12288 kB
4x16384 kB
Date
October 2017
September 2019

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
i7-8700k
3900
Test#1 (Integers)
4127
4388 (6.33%)
Test#2 (FP)
16959
16990 (0.18%)
Test#3 (Generic, ZIP)
5564
7741 (39.13%)
Test#1 (Memory)
12845
24572 (91.29%)
TOTAL
39495
53691 (35.94%)

Multithread

i7-8700k

3900
Test#1 (Integers)
24011
48447 (101.77%)
Test#2 (FP)
108690
230813 (112.36%)
Test#3 (Generic, ZIP)
36616
122817 (235.42%)
Test#1 (Memory)
9327
54726 (486.78%)
TOTAL
178644
456802 (155.71%)

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
i7-8700k
3900
Test#1 (Integers)
12920
16590 (28.41%)
Test#2 (FP)
20678
24545 (18.70%)
Test#3 (Generic, ZIP)
5295
8545 (61.38%)
Test#1 (Memory)
12587
26285 (108.83%)
TOTAL
51480
75966 (47.56%)

Multithread

i7-8700k

3900
Test#1 (Integers)
94259
181329 (92.37%)
Test#2 (FP)
152549
261007 (71.10%)
Test#3 (Generic, ZIP)
39735
126625 (218.67%)
Test#1 (Memory)
8527
66639 (681.47%)
TOTAL
295071
635599 (115.41%)

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
i7-8700k
3900
Test#1 (Integers)
16874
16159 (-4.24%)
Test#2 (FP)
26119
23754 (-9.05%)
Test#3 (Generic, ZIP)
6329
9320 (47.26%)
Test#1 (Memory)
13708
23170 (69.02%)
TOTAL
63030
72403 (14.87%)

Multithread

i7-8700k

3900
Test#1 (Integers)
105740
174727 (65.24%)
Test#2 (FP)
180520
275632 (52.69%)
Test#3 (Generic, ZIP)
44994
125649 (179.26%)
Test#1 (Memory)
8512
44172 (418.95%)
TOTAL
339766
620179 (82.53%)

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
i7-8700k
3900
Test#1 (Integers)
31204
16854 (-45.99%)
Test#2 (FP)
27821
26031 (-6.44%)
Test#3 (Generic, ZIP)
6568
9539 (45.24%)
Test#1 (Memory)
15004
22546 (50.27%)
TOTAL
80598
74970 (-6.98%)

Multithread

i7-8700k

3900
Test#1 (Integers)
202422
229408 (13.33%)
Test#2 (FP)
186332
292810 (57.14%)
Test#3 (Generic, ZIP)
44958
128480 (185.78%)
Test#1 (Memory)
10054
36801 (266.05%)
TOTAL
443765
687500 (54.92%)

Performance/W
i7-8700k
3900
Test#1 (Integers)
2131 points/W
3529 points/W
Test#2 (FP)
1961 points/W
4505 points/W
Test#3 (Generic, ZIP)
473 points/W
1977 points/W
Test#1 (Memory)
106 points/W
566 points/W
TOTAL
4671 points/W
10577 points/W

Performance/GHz
i7-8700k
3900
Test#1 (Integers)
6639 points/GHz
3920 points/GHz
Test#2 (FP)
5919 points/GHz
6054 points/GHz
Test#3 (Generic, ZIP)
1397 points/GHz
2218 points/GHz
Test#1 (Memory)
3192 points/GHz
5243 points/GHz
TOTAL
17148 points/GHz
17435 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. 3.7.9