Athlon X4 840 vs Pentium D 820

Primary details

Comparing Pentium D 820 and Athlon X4 840 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	1870
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Series	Pentium D	4x Athlon
Power efficiency	no data	3.04
Architecture codename	Smithfield (2005)	Kaveri (2014−2015)
Release date	May 2005 (19 years ago)	August 2014 (10 years ago)

Detailed specifications

Pentium D 820 and Athlon X4 840 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)	4 (Quad-Core)
Threads	2	4
Base clock speed	2.8 GHz	3.1 GHz
Boost clock speed	2.8 GHz	3.8 GHz
Bus rate	800 MHz	no data
L1 cache	28 KB	256K
L2 cache	2 MB	4 MB
L3 cache	0 KB	no data
Chip lithography	90 nm	28 nm
Die size	206 mm2	245 mm2
Maximum core temperature	64 °C	no data
Maximum case temperature (TCase)	no data	72 °C
Number of transistors	169 million	2,411 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	-	+
VID voltage range	1.2V-1.4V	no data

Compatibility

Information on Pentium D 820 and Athlon X4 840 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	Socket FM2+
Power consumption (TDP)	95 Watt	65 watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 820 and Athlon X4 840. You'll probably need this information if you require some particular technology.

AES-NI	-	+
FMA	-	+
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

Security technologies

Pentium D 820 and Athlon X4 840 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 820 and Athlon X4 840 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 820 and Athlon X4 840. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR3

Peripherals

Specifications and connection of peripherals supported by Pentium D 820 and Athlon X4 840.

PCIe version	no data	3.0
PCI Express lanes	no data	16

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	4
Threads	2	4
Chip lithography	90 nm	28 nm
Power consumption (TDP)	95 Watt	65 Watt

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Should you still have questions on choice between Pentium D 820 and Athlon X4 840, ask them in Comments section, and we shall answer.

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