EPYC 7551P vs Core 2 Duo E4400

Primary details

Comparing Core 2 Duo E4400 and EPYC 7551P processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	208
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	4.01
Market segment	Desktop processor	Server
Series	no data	AMD EPYC
Power efficiency	no data	12.61
Architecture codename	Allendale (2006−2009)	Naples (2017−2018)
Release date	July 2007 (17 years ago)	20 June 2017 (7 years ago)
Launch price (MSRP)	no data	$2,100

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core 2 Duo E4400 and EPYC 7551P 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	2 (Dual-core)	32 (Dotriaconta-Core)
Threads	2	64
Base clock speed	2 GHz	2 GHz
Boost clock speed	2 GHz	2 GHz
Bus rate	800 MHz	no data
Multiplier	no data	20
L1 cache	64 KB	3 MB
L2 cache	2 MB	16 MB
L3 cache	0 KB	64 MB (shared)
Chip lithography	65 nm	14 nm
Die size	111 mm2	213 mm2
Maximum core temperature	L2=61 °C, M0=73 °C	no data
Number of transistors	167 million	19200 Million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	-	+
VID voltage range	0.85V-1.5V	no data

Compatibility

Information on Core 2 Duo E4400 and EPYC 7551P 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	1 (Uniprocessor)
Socket	LGA775	TR4
Power consumption (TDP)	65 Watt	180 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Duo E4400 and EPYC 7551P. You'll probably need this information if you require some particular technology.

AES-NI	-	+
AVX	-	+
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	-	no data
Hyper-Threading Technology	-	no data
Idle States	+	no data
Thermal Monitoring	+	-
Demand Based Switching	-	no data
FSB parity	-	no data

Security technologies

Core 2 Duo E4400 and EPYC 7551P technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	no data
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Duo E4400 and EPYC 7551P are enumerated here.

AMD-V	-	+
VT-x	-	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Duo E4400 and EPYC 7551P. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR1, DDR2, DDR3	DDR4 Eight-channel
Maximum memory size	no data	2 TiB
Max memory channels	no data	8
Maximum memory bandwidth	no data	170.671 GB/s
ECC memory support	-	+

Peripherals

Specifications and connection of peripherals supported by Core 2 Duo E4400 and EPYC 7551P.

PCIe version	no data	3.0
PCI Express lanes	no data	128

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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Pros & cons summary

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Physical cores	2	32
Threads	2	64
Chip lithography	65 nm	14 nm
Power consumption (TDP)	65 Watt	180 Watt

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Should you still have questions on choice between Core 2 Duo E4400 and EPYC 7551P, ask them in Comments section, and we shall answer.

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