Atom E645CT vs Pentium U5400

Primary details

Comparing Pentium U5400 and Atom E645CT processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	not rated	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Laptop
Series	Intel Pentium	no data
Architecture codename	Arrandale (2010−2011)	Stellarton (2010)
Release date	25 May 2010 (14 years ago)	22 November 2010 (13 years ago)

Detailed specifications

Pentium U5400 and Atom E645CT 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)	1 (Single-Core)
Threads	2	2
Base clock speed	1.2 GHz	no data
Boost clock speed	1.2 GHz	1 GHz
Bus support	2500 MHz	no data
L1 cache	64K (per core)	64 KB (per core)
L2 cache	256K (per core)	512 KB (per core)
L3 cache	3 MB (shared)	0 KB
Chip lithography	32 nm	45 nm
Die size	81+114 mm2	26 mm2
Maximum core temperature	105 °C	no data
Number of transistors	384 million	47 million
64 bit support	+	-
Windows 11 compatibility	-	-
Unlocked multiplier	No	No

Compatibility

Information on Pentium U5400 and Atom E645CT 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	BGA1288	Intel BGA1466
Power consumption (TDP)	18 Watt	4 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium U5400 and Atom E645CT. You'll probably need this information if you require some particular technology.

AES-NI	-	no data
FMA	+	no data
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	-	no data
Hyper-Threading Technology	-	+
Idle States	+	no data
Thermal Monitoring	+	no data
Flex Memory Access	+	no data
PAE	36 Bit	no data
FDI	+	no data
Fast Memory Access	+	no data
Status	Discontinued	no data

Security technologies

Pentium U5400 and Atom E645CT 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 U5400 and Atom E645CT are enumerated here.

VT-d	-	no data
VT-x	-	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium U5400 and Atom E645CT. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR2
Maximum memory size	8 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	12.8 GB/s	no data
ECC memory support	-	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel® HD Graphics for Previous Generation Intel® Processors	Intel GMA 600
Clear Video	+	no data
Graphics max frequency	500 MHz	no data

Graphics interfaces

Available interfaces and connections of Pentium U5400 and Atom E645CT integrated GPUs.

Number of displays supported

2

no data

Peripherals

Specifications and connection of peripherals supported by Pentium U5400 and Atom E645CT.

PCIe version	2.0	no data
PCI Express lanes	1	no data

Pros & cons summary

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Recency	25 May 2010	22 November 2010
Physical cores	2	1
Chip lithography	32 nm	45 nm
Power consumption (TDP)	18 Watt	4 Watt

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Should you still have questions on choice between Pentium U5400 and Atom E645CT, ask them in Comments section, and we shall answer.

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