EPYC 9645 vs Ryzen Threadripper 3990X

Primary details

Comparing Ryzen Threadripper 3990X and EPYC 9645 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	34	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	9.71	no data
Market segment	Desktop processor	Server
Series	AMD Ryzen Threadripper	no data
Power efficiency	17.01	no data
Architecture codename	Matisse (2019−2020)	Turin (2024)
Release date	7 February 2020 (4 years ago)	10 October 2024 (less than a year ago)
Launch price (MSRP)	$3,999	$11,048

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Ryzen Threadripper 3990X and EPYC 9645 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	64 (Tetrahexaconta-Core)	96
Threads	128	192
Base clock speed	2.9 GHz	2.3 GHz
Boost clock speed	4.3 GHz	3.7 GHz
Multiplier	29	no data
L1 cache	96K (per core)	80 KB (per core)
L2 cache	512K (per core)	1 MB (per core)
L3 cache	256 MB	256 MB (shared)
Chip lithography	7 nm, 12 nm	3 nm
Die size	74 mm2	no data
Maximum case temperature (TCase)	95 °C	no data
Number of transistors	3,800 million	no data
64 bit support	+	+
Windows 11 compatibility	+	no data
Unlocked multiplier	+	-

Compatibility

Information on Ryzen Threadripper 3990X and EPYC 9645 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	2
Socket	TR4	SP5
Power consumption (TDP)	280 Watt	320 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen Threadripper 3990X and EPYC 9645. You'll probably need this information if you require some particular technology.

AES-NI	+	+
AVX	+	+
Precision Boost 2	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Ryzen Threadripper 3990X and EPYC 9645 are enumerated here.

AMD-V

+

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen Threadripper 3990X and EPYC 9645. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4-3200	DDR5
Maximum memory size	256 GB	no data
Max memory channels	4	no data
Maximum memory bandwidth	102.403 GB/s	no data
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

-

N/A

Peripherals

Specifications and connection of peripherals supported by Ryzen Threadripper 3990X and EPYC 9645.

PCIe version	4.0	5.0
PCI Express lanes	no data	128

Pros & cons summary

---

Recency	7 February 2020	10 October 2024
Physical cores	64	96
Threads	128	192
Chip lithography	7 nm	3 nm
Power consumption (TDP)	280 Watt	320 Watt

---

Should you still have questions on choice between Ryzen Threadripper 3990X and EPYC 9645, 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.

---