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Ryzen 9 3900X vs Ryzen 7 3800X


Description
Both models 3900X and 3800X are based on Zen 2 architecture.

Zen 2 is fabricated on the 7nm process from TSMC and it’s the third generation of Zen CPUs. It comes with 64kB of L1 cache and 512kB of L2 cache per core. Zen 2 CPUs are divided into 3 categories: Matisse (desktop), Rome (Server) and Castle Peak (high-end desktop).

Using the multithread performance as a reference, the 3900X gets a score of 756.3 k points while the 3800X gets 497.7 k points.

Summarizing, the 3900X is 1.5 times faster than the 3800X. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
870f10
870f10
Core
Matisse
Matisse
Architecture
Base frecuency
3.8 GHz
3.9 GHz
Boost frecuency
4.6 GHz
4.5 GHz
Socket
AM4
AM4
Cores/Threads
12/24
8/16
TDP
105 W
105 W
Cache L1 (d+i)
12x32+12x32 kB
8x32+8x32 kB
Cache L2
12x512 kB
8x512 kB
Cache L3
4x16384 kB
32768 kB
Date
July 2019
July 2019
Mean monothread perf.
72.51k points
75.81k points
Mean multithread perf.
756.3k points
497.74k 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
3900X
3800X
Test#1 (Integers)
4.46k
4.47k (x1)
Test#2 (FP)
18.46k
17.41k (x0.94)
Test#3 (Generic, ZIP)
8.05k
8.23k (x1.02)
Test#1 (Memory)
23.71k
25.15k (x1.06)
TOTAL
54.68k
55.26k (x1.01)

Multithread

3900X

3800X
Test#1 (Integers)
52.65k
36.1k (x0.69)
Test#2 (FP)
265.41k
178.65k (x0.67)
Test#3 (Generic, ZIP)
140.78k
95.98k (x0.68)
Test#1 (Memory)
46.91k
16.03k (x0.34)
TOTAL
505.76k
326.76k (x0.65)

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
3900X
3800X
Test#1 (Integers)
17.35k
17.17k (x0.99)
Test#2 (FP)
25.87k
25.32k (x0.98)
Test#3 (Generic, ZIP)
8.72k
8.36k (x0.96)
Test#1 (Memory)
27.86k
27.86k (x1)
TOTAL
79.8k
78.71k (x0.99)

Multithread

3900X

3800X
Test#1 (Integers)
201.57k
136.06k (x0.68)
Test#2 (FP)
284.41k
195.06k (x0.69)
Test#3 (Generic, ZIP)
145.16k
97.81k (x0.67)
Test#1 (Memory)
100.56k
12.91k (x0.13)
TOTAL
731.7k
441.85k (x0.6)

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
3900X
3800X
Test#1 (Integers)
16.95k
16.76k (x0.99)
Test#2 (FP)
25.37k
25.16k (x0.99)
Test#3 (Generic, ZIP)
9.23k
8.76k (x0.95)
Test#1 (Memory)
24.83k
24.3k (x0.98)
TOTAL
76.38k
74.98k (x0.98)

Multithread

3900X

3800X
Test#1 (Integers)
196.31k
131.36k (x0.67)
Test#2 (FP)
290.5k
198.51k (x0.68)
Test#3 (Generic, ZIP)
143.95k
97.27k (x0.68)
Test#1 (Memory)
64.92k
13.4k (x0.21)
TOTAL
695.69k
440.54k (x0.63)

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
3900X
3800X
Test#1 (Integers)
16.73k
17.1k (x1.02)
Test#2 (FP)
24.74k
26.59k (x1.07)
Test#3 (Generic, ZIP)
8.82k
8.91k (x1.01)
Test#1 (Memory)
22.22k
23.21k (x1.04)
TOTAL
72.51k
75.81k (x1.05)

Multithread

3900X

3800X
Test#1 (Integers)
248.24k
172.04k (x0.69)
Test#2 (FP)
309.66k
214.03k (x0.69)
Test#3 (Generic, ZIP)
140.01k
97.1k (x0.69)
Test#1 (Memory)
58.39k
14.57k (x0.25)
TOTAL
756.3k
497.74k (x0.66)

Performance/W
3900X
3800X
Test#1 (Integers)
2364 points/W
1638 points/W
Test#2 (FP)
2949 points/W
2038 points/W
Test#3 (Generic, ZIP)
1333 points/W
925 points/W
Test#1 (Memory)
556 points/W
139 points/W
TOTAL
7203 points/W
4740 points/W

Performance/GHz
3900X
3800X
Test#1 (Integers)
3638 points/GHz
3799 points/GHz
Test#2 (FP)
5377 points/GHz
5909 points/GHz
Test#3 (Generic, ZIP)
1917 points/GHz
1981 points/GHz
Test#1 (Memory)
4831 points/GHz
5158 points/GHz
TOTAL
15763 points/GHz
16847 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