Celeron B820 vs Athlon X4 840

Primary details

Comparing Athlon X4 840 and Celeron B820 processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	1782	2750
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	7.38	no data
Market segment	Desktop processor	Laptop
Series	4x Athlon	Intel Celeron
Architecture codename	Kaveri (2014−2015)	Sandy Bridge (2011−2013)
Release date	August 2014 (9 years ago)	1 July 2012 (12 years ago)
Launch price (MSRP)	no data	$86
Current price	$23	$34 (0.4x MSRP)

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Athlon X4 840 and Celeron B820 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	4 (Quad-Core)	2 (Dual-core)
Threads	4	2
Base clock speed	3.1 GHz	1.7 GHz
Boost clock speed	3.8 GHz	1.7 GHz
L1 cache	256K	64K (per core)
L2 cache	4 MB	256K (per core)
L3 cache	no data	2 MB (shared)
Chip lithography	28 nm	32 nm
Die size	245 mm2	131 mm2
Maximum core temperature	no data	100 °C
Maximum case temperature (TCase)	72 °C	no data
Number of transistors	2,411 million	504 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	Yes	No

Compatibility

Information on Athlon X4 840 and Celeron B820 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
Socket	Socket FM2+	FCPGA988,PGA988
Power consumption (TDP)	65 watt	35 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Athlon X4 840 and Celeron B820. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE4.1, Intel® SSE4.2
AES-NI	+	-
FMA	+	+
AVX	+	no data
Enhanced SpeedStep (EIST)	no data	+
My WiFi	no data	-
Turbo Boost Technology	no data	-
Hyper-Threading Technology	no data	-
Idle States	no data	+
Thermal Monitoring	no data	+
Flex Memory Access	no data	+
Demand Based Switching	no data	-
FDI	no data	+
Fast Memory Access	no data	+
Status	no data	Discontinued

Security technologies

Athlon X4 840 and Celeron B820 technologies aimed at improving security, for example, by protecting against hacks.

TXT	no data	-
EDB	no data	+
Anti-Theft	no data	-

Virtualization technologies

Virtual machine speed-up technologies supported by Athlon X4 840 and Celeron B820 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Athlon X4 840 and Celeron B820. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3
Maximum memory size	no data	16 GB
Max memory channels	no data	2
Maximum memory bandwidth	no data	21.3 GB/s
ECC memory support	no data	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	no data	Intel® HD Graphics for 2nd Generation Intel® Processors
Graphics max frequency	no data	1.05 GHz

Graphics interfaces

Available interfaces and connections of Athlon X4 840 and Celeron B820 integrated GPUs.

Number of displays supported	no data	2
eDP	no data	+
DisplayPort	no data	+
HDMI	no data	+
SDVO	no data	+
CRT	no data	+

Peripherals

Specifications and connection of peripherals supported by Athlon X4 840 and Celeron B820.

PCIe version	3.0	2.0
PCI Express lanes	16	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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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.

Athlon X4 840 outperforms Celeron B820 by 306% based on our aggregate benchmark results.

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Pros & cons summary

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Performance score	2.15	0.53
Recency	on August 2014	1 July 2012
Physical cores	4	2
Threads	4	2
Chip lithography	28 nm	32 nm
Power consumption (TDP)	65 Watt	35 Watt

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Should you still have questions on choice between Athlon X4 840 and Celeron B820, ask them in Comments section, and we shall answer.

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