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Ryzen 7 3800X vs Ryzen 9 3900


Description
Both models 3800X and 3900 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 3800X gets a score of 497.7 k points while the 3900 gets 687.5 k points.

Summarizing, the 3900 is 1.4 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
3.9 GHz
3.1 GHz
Boost frecuency
4.5 GHz
4.3 GHz
Socket
AM4
AM4
Cores/Threads
8/16
12/24
TDP
105 W
65 W
Cache L1 (d+i)
8x32+8x32 kB
12x32+12x32 kB
Cache L2
8x512 kB
12x512 kB
Cache L3
32768 kB
4x16384 kB
Date
July 2019
September 2019
Mean monothread perf.
75.81k points
74.97k points
Mean multithread perf.
497.74k points
687.5k 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
3800X
3900
Test#1 (Integers)
4.47k
4.39k (x0.98)
Test#2 (FP)
17.41k
16.99k (x0.98)
Test#3 (Generic, ZIP)
8.23k
7.74k (x0.94)
Test#1 (Memory)
25.15k
24.57k (x0.98)
TOTAL
55.26k
53.69k (x0.97)

Multithread

3800X

3900
Test#1 (Integers)
36.1k
48.45k (x1.34)
Test#2 (FP)
178.65k
230.81k (x1.29)
Test#3 (Generic, ZIP)
95.98k
122.82k (x1.28)
Test#1 (Memory)
16.03k
54.73k (x3.41)
TOTAL
326.76k
456.8k (x1.4)

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
3800X
3900
Test#1 (Integers)
17.17k
16.59k (x0.97)
Test#2 (FP)
25.32k
24.55k (x0.97)
Test#3 (Generic, ZIP)
8.36k
8.55k (x1.02)
Test#1 (Memory)
27.86k
26.28k (x0.94)
TOTAL
78.71k
75.97k (x0.97)

Multithread

3800X

3900
Test#1 (Integers)
136.06k
181.33k (x1.33)
Test#2 (FP)
195.06k
261.01k (x1.34)
Test#3 (Generic, ZIP)
97.81k
126.62k (x1.29)
Test#1 (Memory)
12.91k
66.64k (x5.16)
TOTAL
441.85k
635.6k (x1.44)

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
3800X
3900
Test#1 (Integers)
16.76k
16.16k (x0.96)
Test#2 (FP)
25.16k
23.75k (x0.94)
Test#3 (Generic, ZIP)
8.76k
9.32k (x1.06)
Test#1 (Memory)
24.3k
23.17k (x0.95)
TOTAL
74.98k
72.4k (x0.97)

Multithread

3800X

3900
Test#1 (Integers)
131.36k
174.73k (x1.33)
Test#2 (FP)
198.51k
275.63k (x1.39)
Test#3 (Generic, ZIP)
97.27k
125.65k (x1.29)
Test#1 (Memory)
13.4k
44.17k (x3.3)
TOTAL
440.54k
620.18k (x1.41)

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
3800X
3900
Test#1 (Integers)
17.1k
16.85k (x0.99)
Test#2 (FP)
26.59k
26.03k (x0.98)
Test#3 (Generic, ZIP)
8.91k
9.54k (x1.07)
Test#1 (Memory)
23.21k
22.55k (x0.97)
TOTAL
75.81k
74.97k (x0.99)

Multithread

3800X

3900
Test#1 (Integers)
172.04k
229.41k (x1.33)
Test#2 (FP)
214.03k
292.81k (x1.37)
Test#3 (Generic, ZIP)
97.1k
128.48k (x1.32)
Test#1 (Memory)
14.57k
36.8k (x2.53)
TOTAL
497.74k
687.5k (x1.38)

Performance/W
3800X
3900
Test#1 (Integers)
1638 points/W
3529 points/W
Test#2 (FP)
2038 points/W
4505 points/W
Test#3 (Generic, ZIP)
925 points/W
1977 points/W
Test#1 (Memory)
139 points/W
566 points/W
TOTAL
4740 points/W
10577 points/W

Performance/GHz
3800X
3900
Test#1 (Integers)
3799 points/GHz
3920 points/GHz
Test#2 (FP)
5909 points/GHz
6054 points/GHz
Test#3 (Generic, ZIP)
1981 points/GHz
2218 points/GHz
Test#1 (Memory)
5158 points/GHz
5243 points/GHz
TOTAL
16847 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. 3.11.4