Pentium D 840 EE vs Xeon 6521P

Primary details

Comparing processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	105	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	34.00	no data
Market segment	Server	Desktop processor
Power efficiency	17.51	no data
Designer	Intel	Intel
Manufacturer	Intel	no data
Architecture codename	Granite Rapids (2024−2025)	Smithfield (2005)
Release date	24 February 2025 (less than a year ago)	May 2005 (20 years ago)
Launch price (MSRP)	$1,250	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Performance to price scatter graph

Detailed specifications

Xeon 6521P and Pentium D 840 EE 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	24 (Tetracosa-Core)	2 (Dual-core)
Threads	48	4
Base clock speed	2.6 GHz	no data
Boost clock speed	4.1 GHz	3.2 GHz
L1 cache	112 KB (per core)	28 KB
L2 cache	2 MB (per core)	2 MB
L3 cache	144 MB (shared)	0 KB
Chip lithography	Intel 3 nm	90 nm
Die size	598 mm2	206 mm2
Maximum case temperature (TCase)	82 °C	no data
Number of transistors	no data	169 million
64 bit support	+	+
Windows 11 compatibility	no data	-

Compatibility

Information on Xeon 6521P and Pentium D 840 EE 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	2
Socket	FCLGA4710	775
Power consumption (TDP)	225 Watt	130 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon 6521P and Pentium D 840 EE. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512, Intel® AMX	no data
AES-NI	+	-
AVX	+	-
Enhanced SpeedStep (EIST)	+	+
Speed Shift	+	no data
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	+	no data
TSX	+	-
Deep Learning Boost	+	-

Security technologies

Xeon 6521P and Pentium D 840 EE technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	no data
EDB	+	no data
SGX	+	no data
OS Guard	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon 6521P and Pentium D 840 EE are enumerated here.

VT-d	+	no data
VT-x	+	no data
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon 6521P and Pentium D 840 EE. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR5(6400MT/s)	DDR1, DDR2, DDR3
Maximum memory size	4 TB	no data
Max memory channels	8	no data
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

no data

Peripherals

Specifications and connection of peripherals supported by Xeon 6521P and Pentium D 840 EE.

PCIe version	5.0	no data
PCI Express lanes	136	no data

Pros & cons summary

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Physical cores	24	2
Threads	48	4
Power consumption (TDP)	225 Watt	130 Watt

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