Ryzen 9 3900X vs i9-9940X

Primary details

Comparing Core i9-9940X and Ryzen 9 3900X processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	352	274
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	5.29	21.67
Market segment	Desktop processor	Desktop processor
Series	Intel Core i9	AMD Ryzen 9
Power efficiency	10.13	15.54
Architecture codename	Skylake (server) (2017−2018)	Matisse (Zen 2) (2019−2020)
Release date	19 October 2018 (6 years ago)	7 July 2019 (5 years ago)
Launch price (MSRP)	$1,387	$499

Cost-effectiveness evaluation

Performance per price, higher is better.

Ryzen 9 3900X has 310% better value for money than i9-9940X.

Detailed specifications

Core i9-9940X 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 cores	14 (Tetradeca-Core)	12 (Dodeca-Core)
Threads	28	24
Base clock speed	3.3 GHz	3.8 GHz
Boost clock speed	4.5 GHz	4.6 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	no data
Multiplier	33	no data
L1 cache	64 KB (per core)	96K (per core)
L2 cache	1 MB (per core)	512K (per core)
L3 cache	19.25 MB (shared)	64 MB
Chip lithography	14 nm	7 nm, 12 nm
Die size	484 mm2	no data
Maximum core temperature	88 °C	95 °C
Number of transistors	no data	19,200 million
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	+	+

Compatibility

Information on Core i9-9940X 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 configuration	1 (Uniprocessor)	1 (Uniprocessor)
Socket	FCLGA2066	AM4
Power consumption (TDP)	165 Watt	125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-9940X and Ryzen 9 3900X. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512	no data
AES-NI	+	+
AVX	+	+
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	+	no data
TSX	+	-
Turbo Boost Max 3.0	+	no data
Precision Boost 2	no data	+

Security technologies

Core i9-9940X and Ryzen 9 3900X technologies aimed at improving security, for example, by protecting against hacks.

EDB

+

no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-9940X and Ryzen 9 3900X are enumerated here.

AMD-V	-	+
VT-d	+	no data
VT-x	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-9940X and Ryzen 9 3900X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-2666	DDR4 Dual-channel
Maximum memory size	128 GB	128 GB
Max memory channels	4	2
Maximum memory bandwidth	85.33 GB/s	51.196 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

-

Peripherals

Specifications and connection of peripherals supported by Core i9-9940X and Ryzen 9 3900X.

PCIe version	3.0	no data
PCI Express lanes	44	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.

---

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.

---

Pros & cons summary

---

Performance score	17.67	20.53
Recency	19 October 2018	7 July 2019
Physical cores	14	12
Threads	28	24
Chip lithography	14 nm	7 nm
Power consumption (TDP)	165 Watt	125 Watt

---

Should you still have questions on choice between Core i9-9940X and Ryzen 9 3900X, ask them in Comments section, and we shall answer.

Vote for your favorite

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU.

---