Celeron 3955U vs i7-975

Primary details

Comparing Core i7-975 and Celeron 3955U processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1833	2507
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.10	no data
Market segment	Desktop processor	Laptop
Series	Core i7 (Desktop)	Intel Celeron
Power efficiency	1.60	5.87
Architecture codename	Bloomfield (2008−2010)	Skylake (2015−2016)
Release date	2 June 2009 (15 years ago)	15 August 2015 (9 years ago)
Launch price (MSRP)	$476	$107

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i7-975 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	4 (Quad-Core)	2 (Dual-core)
Threads	8	2
Base clock speed	3.33 GHz	2 GHz
Boost clock speed	3.6 GHz	2 GHz
Bus type	no data	OPI
Bus rate	1333 MHz	4 GT/s
Multiplier	no data	20
L1 cache	64 KB (per core)	128 KB
L2 cache	256 KB (per core)	512 KB
L3 cache	8 MB (shared)	2 MB
Chip lithography	45 nm	14 nm
Die size	263 mm2	98.57 mm2
Maximum core temperature	no data	100 °C
Maximum case temperature (TCase)	68 °C	no data
Number of transistors	731 million	1750 Million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	-

Compatibility

Information on Core i7-975 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	1 (Uniprocessor)
Socket	FCLGA1366	FCBGA1356
Power consumption (TDP)	130 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-975 and Celeron 3955U. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	Intel® SSE4.1, Intel® SSE4.2
AES-NI	-	+
Enhanced SpeedStep (EIST)	+	+
My WiFi	no data	+
Turbo Boost Technology	1.0	-
Hyper-Threading Technology	+	-
Idle States	+	+
Thermal Monitoring	-	+
Flex Memory Access	no data	+
Smart Response	no data	+
Demand Based Switching	-	no data
PAE	36 Bit	no data

Security technologies

Core i7-975 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 i7-975 and Celeron 3955U are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-975 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	24 GB	32 GB
Max memory channels	3	2
Maximum memory bandwidth	25.6 GB/s	34.134 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	N/A	Intel HD Graphics 510
Max video memory	no data	32 GB
Quick Sync Video	-	+
Clear Video HD	no data	+
Graphics max frequency	no data	900 MHz

Graphics interfaces

Available interfaces and connections of Core i7-975 and Celeron 3955U integrated GPUs.

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

Graphics image quality

Maximum display resolutions supported by Core i7-975 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 i7-975 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 i7-975 and Celeron 3955U.

PCIe version	2.0	3.0
PCI Express lanes	no data	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	2.20	0.93
Recency	2 June 2009	15 August 2015
Physical cores	4	2
Threads	8	2
Chip lithography	45 nm	14 nm
Power consumption (TDP)	130 Watt	15 Watt

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Should you still have questions on choice between Core i7-975 and Celeron 3955U, ask them in Comments section, and we shall answer.

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