Celeron 3955U vs i7-640M

Primary details

Comparing Core i7-640M and Celeron 3955U processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	2265	2509
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Laptop
Series	Intel Core i7	Intel Celeron
Power efficiency	3.52	5.87
Architecture codename	Arrandale (2010−2011)	Skylake (2015−2016)
Release date	1 September 2010 (14 years ago)	15 August 2015 (9 years ago)
Launch price (MSRP)	$346	$107

Detailed specifications

Core i7-640M and Celeron 3955U 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	4	2
Base clock speed	2.8 GHz	2 GHz
Boost clock speed	3.46 GHz	2 GHz
Bus type	DMI 1.0	OPI
Bus rate	1 × 2.5 GT/s	4 GT/s
Multiplier	21	20
L1 cache	64K (per core)	128 KB
L2 cache	256K (per core)	512 KB
L3 cache	4 MB (shared)	2 MB
Chip lithography	32 nm	14 nm
Die size	81+114 mm2	98.57 mm2
Maximum core temperature	105 °C	100 °C
Number of transistors	384 million	1750 Million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Core i7-640M and Celeron 3955U 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 (Uniprocessor)	1 (Uniprocessor)
Socket	BGA1288,PGA988	FCBGA1356
Power consumption (TDP)	35 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-640M and Celeron 3955U. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2	Intel® SSE4.1, Intel® SSE4.2
AES-NI	+	+
FMA	+	-
vPro	+	no data
Enhanced SpeedStep (EIST)	+	+
My WiFi	no data	+
Turbo Boost Technology	+	-
Hyper-Threading Technology	+	-
Idle States	+	+
Thermal Monitoring	+	+
Flex Memory Access	+	+
Smart Response	no data	+
PAE	36 Bit	no data
FDI	+	no data
Fast Memory Access	+	no data

Security technologies

Core i7-640M and Celeron 3955U technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+
Secure Key	no data	+
Identity Protection	-	+
SGX	no data	Yes with Intel® ME
OS Guard	no data	-

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-640M and Celeron 3955U are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-640M and Celeron 3955U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR4-1866/2133, LPDDR3-1600/1866, DDR3L-1333/1600
Maximum memory size	8 GB	32 GB
Max memory channels	2	2
Maximum memory bandwidth	17.051 GB/s	34.134 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel® HD Graphics for Previous Generation Intel® Processors	Intel HD Graphics 510
Max video memory	no data	32 GB
Quick Sync Video	-	+
Clear Video	+	no data
Clear Video HD	+	+
Graphics max frequency	766 MHz	900 MHz

Graphics interfaces

Available interfaces and connections of Core i7-640M and Celeron 3955U integrated GPUs.

Number of displays supported	2	3
eDP	no data	+
DisplayPort	-	+
HDMI	-	+
DVI	no data	+

Graphics image quality

Maximum display resolutions supported by Core i7-640M and Celeron 3955U integrated GPUs, including resolutions over different interfaces.

4K resolution support	no data	+
Max resolution over HDMI 1.4	no data	4096x2304@24Hz
Max resolution over eDP	no data	4096x2304@60Hz
Max resolution over DisplayPort	no data	4096x2304@60Hz
Max resolution over VGA	no data	N/A

Graphics API support

APIs supported by Core i7-640M and Celeron 3955U integrated GPUs, sometimes API versions are included.

DirectX	no data	12
OpenGL	no data	4.4

Peripherals

Specifications and connection of peripherals supported by Core i7-640M and Celeron 3955U.

PCIe version	2.0	3.0
PCI Express lanes	16	12

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.

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Pros & cons summary

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Performance score	1.30	0.93
Recency	1 September 2010	15 August 2015
Threads	4	2
Chip lithography	32 nm	14 nm
Power consumption (TDP)	35 Watt	15 Watt

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Should you still have questions on choice between Core i7-640M and Celeron 3955U, ask them in Comments section, and we shall answer.

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