EPYC 7742 vs EPYC 7642

Place in the ranking	91	46
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	5.26	3.35
Market segment	Server	Server
Series	AMD EPYC	AMD EPYC
Power efficiency	15.56	18.44
Architecture codename	Zen 2 (2017−2020)	Zen 2 (2017−2020)
Release date	7 August 2019 (5 years ago)	7 August 2019 (5 years ago)
Launch price (MSRP)	$4,775	$6,950

Cost-effectiveness evaluation

Performance per price, higher is better.

EPYC 7642 has 57% better value for money than EPYC 7742.

Detailed specifications

EPYC 7642 and EPYC 7742 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	48 (Octatetraconta-Core)	64 (Tetrahexaconta-Core)
Threads	96	128
Base clock speed	2.4 GHz	2.25 GHz
Boost clock speed	3.3 GHz	3.4 GHz
Multiplier	23	22.5
L1 cache	3 MB	4 MB
L2 cache	24 MB	32 MB
L3 cache	256 MB (shared)	256 MB (shared)
Chip lithography	7 nm, 14 nm	7 nm, 14 nm
Die size	192 mm²	192 mm²
Number of transistors	4,800 million	4,800 million
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	+	+

Compatibility

Information on EPYC 7642 and EPYC 7742 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)	2 (Multiprocessor)
Socket	TR4	TR4
Power consumption (TDP)	225 Watt	225 Watt

Technologies and extensions

Technological solutions and additional instructions supported by EPYC 7642 and EPYC 7742. 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 EPYC 7642 and EPYC 7742 are enumerated here.

AMD-V

Memory specs

Types, maximum amount and channel quantity of RAM supported by EPYC 7642 and EPYC 7742. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4 Eight-channel	DDR4 Eight-channel
Maximum memory size	4 TiB	4 TiB
Max memory channels	8	8
Maximum memory bandwidth	204.763 GB/s	204.763 GB/s
ECC memory support	+	+

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.

EPYC 7642 37.15

EPYC 7742 44.02
+18.5%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

EPYC 7642 58795

EPYC 7742 69663
+18.5%

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

EPYC 7642 1274
+5.8%

EPYC 7742 1204

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

EPYC 7642 10479

EPYC 7742 11782
+12.4%