Phenom II X2 B55 vs Pentium G840

Place in the ranking	2604	2655
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	4.61	2.02
Market segment	Desktop processor	Desktop processor
Power efficiency	1.16	0.88
Architecture codename	Sandy Bridge (2011−2013)	Callisto (2009−2010)
Release date	22 May 2011 (13 years ago)	1 October 2009 (15 years ago)
Launch price (MSRP)	$60	$48

Cost-effectiveness evaluation

Performance per price, higher is better.

Pentium G840 has 128% better value for money than Phenom II X2 B55.

Detailed specifications

Pentium G840 and Phenom II X2 B55 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)	2 (Dual-core)
Threads	2	2
Base clock speed	2.8 GHz	3 GHz
Boost clock speed	2.8 GHz	3 GHz
L1 cache	64 KB (per core)	128 KB (per core)
L2 cache	256 KB (per core)	512 KB (per core)
L3 cache	3 MB (shared)	6 MB (shared)
Chip lithography	32 nm	45 nm
Die size	131 mm²	258 mm²
Maximum core temperature	69 °C	no data
Number of transistors	504 million	758 million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Pentium G840 and Phenom II X2 B55 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	FCLGA1155	AM3
Power consumption (TDP)	65 Watt	80 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium G840 and Phenom II X2 B55. You'll probably need this information if you require some particular technology.

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

Security technologies

Pentium G840 and Phenom II X2 B55 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 G840 and Phenom II X2 B55 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium G840 and Phenom II X2 B55. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3
Maximum memory size	32 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	21 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel® HD Graphics for 2nd Generation Intel® Processors	On certain motherboards (Chipset feature)
Graphics max frequency	1.1 GHz	no data

Graphics interfaces

Available interfaces and connections of Pentium G840 and Phenom II X2 B55 integrated GPUs.

Number of displays supported

no data

Peripherals

Specifications and connection of peripherals supported by Pentium G840 and Phenom II X2 B55.

PCIe version

2.0

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.

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.

Pentium G840 0.81
+6.6%

Phenom II X2 B55 0.76

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Pentium G840 1264
+6.8%

Phenom II X2 B55 1183

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

Pentium G840 452
+18%

Phenom II X2 B55 383

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

Pentium G840 789
+14.8%

Phenom II X2 B55 687

Gaming performance

Pros & cons summary

Performance score	0.81	0.76
Recency	22 May 2011	1 October 2009
Chip lithography	32 nm	45 nm
Power consumption (TDP)	65 Watt	80 Watt

Pentium G840 has a 6.6% higher aggregate performance score, an age advantage of 1 year, a 40.6% more advanced lithography process, and 23.1% lower power consumption.

Given the minimal performance differences, no clear winner can be declared between Pentium G840 and Phenom II X2 B55.

Should you still have questions on choice between Pentium G840 and Phenom II X2 B55, ask them in Comments section, and we shall answer.