AMD EPYC 7643: specs and benchmarks

Summary

AMD started EPYC 7643 sales 15 March 2021 at a recommended price of $4,995. This is a Milan architecture desktop processor primarily aimed at professional systems. It has 48 cores and 96 threads, and is based on 7 nm+ manufacturing technology, with a max turbo frequency of 3600 MHz and an unlocked multiplier.

Compatibility-wise, this is AMD Socket SP3 processor with a TDP of 225 Watt. It supports DDR4-3200 memory.

General info

EPYC 7643 processor market type (desktop or notebook), architecture, sales start time and pricing.

Place in performance ranking	31
Place by popularity	not in top-100
Value for money	3.51
Market segment	Server
Series	AMD EPYC
Architecture codename	Milan (2021)
Release date	15 March 2021 (3 years old)
Launch price (MSRP)	$4,995	of 305 (Core i7-870)
Current price	$8748 (1.8x MSRP)	of 17802 (Threadripper PRO 7995WX)

Technical specs

Basic microprocessor parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters can generally indicate CPU performance, but to be more precise you have to review its test results.

Physical cores	48 (Octatetraconta-Core)
Threads	96
Base clock speed	2.3 GHz	of 4.7 (FX-9590)
Boost clock speed	3.6 GHz	of 6.2 (Core i9-14900KS)
L1 cache	64 KB (per core)	of 7475.2 (Apple M2 Pro 10-Core)
L2 cache	512 KB (per core)	of 36864 (Apple M2 Max)
L3 cache	256 MB (shared)	of 768 (EPYC 7373X)
Chip lithography	7 nm+	of 3 (Apple M3 Max 16-Core)
Die size	8x 81 mm2
Number of transistors	33,200 million	of 9900000 (Ryzen 5 7645HX)
64 bit support	+
Windows 11 compatibility	+
Unlocked multiplier	Yes

Compatibility

Information on EPYC 7643 compatibility with other computer components and devices: 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	2	of 8 (Opteron 842)
Socket	SP3
Power consumption (TDP)	225 Watt	of 400 (Xeon Platinum 9282)

Technologies and extensions

Technological capabilities and additional instructions supported by EPYC 7643. You'll probably need this information if you require some particular technology.

AES-NI	+
AVX	+

Virtualization technologies

Supported virtual machine optimization technologies. Some are specific to Intel only, some to AMD.

AMD-V

+

Memory specs

Types, maximum amount and channel number of RAM supported by EPYC 7643's memory controller. Depending on the motherboard, higher memory frequency may be supported.

Supported memory types	DDR4-3200
Maximum memory size	4 TiB	of 786 (Xeon E5-2670 v3)
Maximum memory bandwidth	204.795 GB/s	of 460.8 (EPYC 9124)

Graphics specifications

General parameters of a GPU integrated into EPYC 7643.

Integrated graphics card

N/A

Peripherals

Specifications and connection types of supported peripherals.

PCIe version	4.0	of 5 (Core i9-12900K)
PCI Express lanes	128

Benchmark performance

Single-core and multi-core benchmark results of EPYC 7643. Overall benchmark performance 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.

Relative perfomance

Overall EPYC 7643 performance compared to nearest competitors among server CPUs.

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