FX-8120 vs Ryzen 9 3900

Primary details

Comparing Ryzen 9 3900 and FX-8120 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	289	1379
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	20.34	no data
Market segment	Desktop processor	Desktop processor
Series	AMD Matisse (Ryzen 3000 Desktop)	no data
Power efficiency	28.23	3.14
Architecture codename	Matisse (Zen 2) (2019−2020)	Zambezi (2011−2012)
Release date	24 September 2019 (5 years ago)	12 October 2011 (13 years ago)
Launch price (MSRP)	$499	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Ryzen 9 3900 and FX-8120 basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores	12 (Dodeca-Core)	8 (Octa-Core)
Threads	24	8
Base clock speed	3.1 GHz	3.1 GHz
Boost clock speed	4.3 GHz	4 GHz
L1 cache	768 KB	384 KB
L2 cache	6 MB	8192 KB
L3 cache	64 MB	8192 KB
Chip lithography	7 nm, 12 nm	32 nm
Die size	2x 74 mm2	315 mm2
Maximum core temperature	no data	61 °C
Number of transistors	7,600 million	1,200 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	+
P0 Vcore voltage	no data	Min: 1.0125 V - Max: 1.4125 V

Compatibility

Information on Ryzen 9 3900 and FX-8120 compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration	1	1
Socket	AM4	AM3+
Power consumption (TDP)	65 Watt	125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen 9 3900 and FX-8120. You'll probably need this information if you require some particular technology.

Instruction set extensions	86x MMX(+), SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A,-64, AMD-V, AES, AVX, AVX2, FMA3, SHA, Precision Boost 2	no data
AES-NI	+	+
FMA	-	+
AVX	+	+
Precision Boost 2	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Ryzen 9 3900 and FX-8120 are enumerated here.

AMD-V

+

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen 9 3900 and FX-8120. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-3200	DDR3
Maximum memory size	128 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	51.196 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

no data

Peripherals

Specifications and connection of peripherals supported by Ryzen 9 3900 and FX-8120.

PCIe version	4.0	n/a
PCI Express lanes	24	no data

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.

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Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

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Pros & cons summary

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Performance score	20.12	4.31
Recency	24 September 2019	12 October 2011
Physical cores	12	8
Threads	24	8
Chip lithography	7 nm	32 nm
Power consumption (TDP)	65 Watt	125 Watt

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Should you still have questions on choice between Ryzen 9 3900 and FX-8120, ask them in Comments section, and we shall answer.

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