Ryzen 7 PRO 7840U vs EPYC 7251

Primary details

Comparing EPYC 7251 and Ryzen 7 PRO 7840U processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	790	426
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	3.18	no data
Market segment	Server	Laptop
Series	AMD EPYC	AMD Phoenix (Zen 4, Ryzen 7040)
Power efficiency	7.42	52.78
Architecture codename	Naples (2017−2018)	Phoenix (Zen 4) (2023)
Release date	29 June 2017 (7 years ago)	3 May 2023 (1 year ago)
Launch price (MSRP)	$574	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

EPYC 7251 and Ryzen 7 PRO 7840U 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	8 (Octa-Core)	8 (Octa-Core)
Threads	16	16
Base clock speed	2.1 GHz	3.3 GHz
Boost clock speed	2.9 GHz	5.1 GHz
Multiplier	21	no data
L1 cache	96K (per core)	512 KB
L2 cache	512K (per core)	8 MB
L3 cache	32 MB (shared)	16 MB
Chip lithography	14 nm	4 nm
Die size	192 mm2	178 mm2
Maximum core temperature	no data	100 °C
Number of transistors	4,800 million	no data
64 bit support	+	+
Windows 11 compatibility	-	+
Unlocked multiplier	+	-

Compatibility

Information on EPYC 7251 and Ryzen 7 PRO 7840U 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	2 (Multiprocessor)	no data
Socket	TR4	no data
Power consumption (TDP)	120 Watt	28 Watt

Technologies and extensions

Technological solutions and additional instructions supported by EPYC 7251 and Ryzen 7 PRO 7840U. You'll probably need this information if you require some particular technology.

AES-NI	+	-
AVX	+	-

Virtualization technologies

Virtual machine speed-up technologies supported by EPYC 7251 and Ryzen 7 PRO 7840U are enumerated here.

AMD-V

+

-

Memory specs

Types, maximum amount and channel quantity of RAM supported by EPYC 7251 and Ryzen 7 PRO 7840U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4 Eight-channel	no data
Maximum memory size	2 TiB	no data
Max memory channels	8	no data
Maximum memory bandwidth	153.652 GB/s	no data
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

AMD Radeon 780M

Peripherals

Specifications and connection of peripherals supported by EPYC 7251 and Ryzen 7 PRO 7840U.

PCIe version	3.0	no data
PCI Express lanes	128	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.

Pros & cons summary

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Performance score	9.78	16.24
Recency	29 June 2017	3 May 2023
Chip lithography	14 nm	4 nm
Power consumption (TDP)	120 Watt	28 Watt

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Should you still have questions on choice between EPYC 7251 and Ryzen 7 PRO 7840U, ask them in Comments section, and we shall answer.

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