EPYC 9655P vs Pentium D 840

Primary details

Comparing Pentium D 840 and EPYC 9655P processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	1
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	2.48
Market segment	Desktop processor	Server
Power efficiency	no data	23.66
Architecture codename	Smithfield (2005)	Turin (2024)
Release date	May 2005 (19 years ago)	10 October 2024 (less than a year ago)
Launch price (MSRP)	no data	$10,811

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Pentium D 840 and EPYC 9655P 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)	96
Threads	2	192
Base clock speed	3.2 GHz	2.6 GHz
Boost clock speed	3.2 GHz	4.5 GHz
L1 cache	28 KB	80 KB (per core)
L2 cache	2 MB	1 MB (per core)
L3 cache	0 KB	384 MB (shared)
Chip lithography	90 nm	4 nm
Die size	206 mm2	12x 70.6 mm2
Maximum core temperature	70 °C	no data
Number of transistors	169 million	99,780 million
64 bit support	+	+
Windows 11 compatibility	-	no data
VID voltage range	1.2V-1.4V	no data

Compatibility

Information on Pentium D 840 and EPYC 9655P 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	1
Socket	PLGA775	SP5
Power consumption (TDP)	130 Watt	400 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 840 and EPYC 9655P. 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
Demand Based Switching	-	no data
PAE	32 Bit	no data
FSB parity	-	no data
Precision Boost 2	no data	+

Security technologies

Pentium D 840 and EPYC 9655P 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 Pentium D 840 and EPYC 9655P are enumerated here.

AMD-V	-	+
VT-d	-	no data
VT-x	-	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 840 and EPYC 9655P. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR5

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

N/A

Peripherals

Specifications and connection of peripherals supported by Pentium D 840 and EPYC 9655P.

PCIe version	no data	5.0
PCI Express lanes	no data	128

Pros & cons summary

---

Physical cores	2	96
Threads	2	192
Chip lithography	90 nm	4 nm
Power consumption (TDP)	130 Watt	400 Watt

---

Should you still have questions on choice between Pentium D 840 and EPYC 9655P, 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.

---