Ryzen 9 3900X vs Phenom II X4 945 (125W)

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Primary details

Comparing Phenom II X4 945 (125W) and Ryzen 9 3900X processor market type (desktop or notebook), architecture, sales start time and price.

Place in the rankingnot rated275
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluationno data21.71
Market segmentDesktop processorDesktop processor
Seriesno dataAMD Ryzen 9
Power efficiencyno data15.53
Architecture codenameDeneb (2009−2011)Matisse (Zen 2) (2019−2020)
Release date23 April 2009 (15 years ago)7 July 2019 (5 years ago)
Launch price (MSRP)no data$499

Cost-effectiveness evaluation

Performance per price, higher is better.

no data

Detailed specifications

Phenom II X4 945 (125W) and Ryzen 9 3900X 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 cores4 (Quad-Core)12 (Dodeca-Core)
Threads424
Base clock speed3 GHz3.8 GHz
Boost clock speed3 GHz4.6 GHz
L1 cache128 KB (per core)96K (per core)
L2 cache512 KB (per core)512K (per core)
L3 cache6 MB (shared)64 MB
Chip lithography45 nm7 nm, 12 nm
Die size258 mm2no data
Maximum core temperatureno data95 °C
Number of transistors758 million19,200 million
64 bit support++
Windows 11 compatibility-+
Unlocked multiplier-+

Compatibility

Information on Phenom II X4 945 (125W) and Ryzen 9 3900X 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 configuration11 (Uniprocessor)
SocketAM3AM4
Power consumption (TDP)125 Watt125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Phenom II X4 945 (125W) and Ryzen 9 3900X. You'll probably need this information if you require some particular technology.

AES-NI-+
AVX-+
Precision Boost 2no data+

Virtualization technologies

Virtual machine speed-up technologies supported by Phenom II X4 945 (125W) and Ryzen 9 3900X are enumerated here.

AMD-V++

Memory specs

Types, maximum amount and channel quantity of RAM supported by Phenom II X4 945 (125W) and Ryzen 9 3900X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3DDR4 Dual-channel
Maximum memory sizeno data128 GB
Max memory channelsno data2
Maximum memory bandwidthno data51.196 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardOn certain motherboards (Chipset feature)-

Peripherals

Specifications and connection of peripherals supported by Phenom II X4 945 (125W) and Ryzen 9 3900X.

PCIe version2.0no data

Pros & cons summary


Recency 23 April 2009 7 July 2019
Physical cores 4 12
Threads 4 24
Chip lithography 45 nm 7 nm

Ryzen 9 3900X has an age advantage of 10 years, 200% more physical cores and 500% more threads, and a 542.9% more advanced lithography process.

We couldn't decide between Phenom II X4 945 (125W) and Ryzen 9 3900X. We've got no test results to judge.


Should you still have questions on choice between Phenom II X4 945 (125W) and Ryzen 9 3900X, ask them in Comments section, and we shall answer.

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AMD Phenom II X4 945 (125W)
Phenom II X4 945 (125W)
AMD Ryzen 9 3900X
Ryzen 9 3900X

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Community ratings

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3.7 80 votes

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