Celeron B815 vs i7-940XM

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Primary details

Comparing Core i7-940XM and Celeron B815 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking2210not rated
Place by popularitynot in top-100not in top-100
Market segmentLaptopLaptop
SeriesIntel Core i7Intel Celeron
Power efficiency2.39no data
Architecture codenameClarksfield (2009−2010)Sandy Bridge (2011−2013)
Release date20 June 2010 (14 years ago)1 January 2012 (12 years ago)
Launch price (MSRP)$1,096$86

Detailed specifications

Core i7-940XM and Celeron B815 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 cores4 (Quad-Core)2 (Dual-core)
Threads82
Base clock speed2.13 GHz1.6 GHz
Boost clock speed3.33 GHz1.6 GHz
Bus typeno dataDMI 2.0
Bus rate2500 MHz4 × 5 GT/s
Multiplierno data16
L1 cache64 KB (per core)128 KB
L2 cache256 KB (per core)512 KB
L3 cache8 MB (shared)2 MB (shared)
Chip lithography45 nm32 nm
Die size296 mm2131 mm2
Maximum core temperature100 °C100 °C
Number of transistors774 million504 million
64 bit support++
Windows 11 compatibility--
Unlocked multiplier+-

Compatibility

Information on Core i7-940XM and Celeron B815 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 configuration11 (Uniprocessor)
SocketFCPGA988,PGA988FCPGA988,PGA988
Power consumption (TDP)55 Watt35 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-940XM and Celeron B815. You'll probably need this information if you require some particular technology.

Instruction set extensionsIntel® SSE4.2Intel® SSE4.1, Intel® SSE4.2
FMA-+
Enhanced SpeedStep (EIST)++
My WiFino data-
Turbo Boost Technology+-
Hyper-Threading Technology+-
Idle States++
Thermal Monitoring++
Flex Memory Accessno data+
Demand Based Switching--
PAE36 Bitno data
FDIno data+
Fast Memory Accessno data+

Security technologies

Core i7-940XM and Celeron B815 technologies aimed at improving security, for example, by protecting against hacks.

TXT+-
EDB++
Anti-Theftno data-

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-940XM and Celeron B815 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-940XM and Celeron B815. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3-1066, DDR3-1333DDR3
Maximum memory size8 GB16 GB
Max memory channels22
Maximum memory bandwidth21 GB/s21.335 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardNoneIntel® HD Graphics for 2nd Generation Intel® Processors
Graphics max frequencyno data1.05 GHz

Graphics interfaces

Available interfaces and connections of Core i7-940XM and Celeron B815 integrated GPUs.

Number of displays supportedno data2
eDPno data+
DisplayPort-+
HDMI-+
SDVOno data+
CRTno data+

Peripherals

Specifications and connection of peripherals supported by Core i7-940XM and Celeron B815.

PCIe version22.0
PCI Express lanes1616

Synthetic benchmark performance

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



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.

i7-940XM 2209
+202%
Celeron B815 731

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.

i7-940XM 389
+60.1%
Celeron B815 243

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.

i7-940XM 1073
+160%
Celeron B815 413

Cinebench 10 32-bit single-core

Cinebench R10 is an ancient ray tracing benchmark for processors by Maxon, authors of Cinema 4D. Its single core version uses just one CPU thread to render a futuristic looking motorcycle.

i7-940XM 3630
+73.4%
Celeron B815 2093

Cinebench 10 32-bit multi-core

Cinebench Release 10 Multi Core is a variant of Cinebench R10 using all the processor threads. Possible number of threads is limited by 16 in this version.

i7-940XM 11391
+183%
Celeron B815 4029

3DMark06 CPU

3DMark06 is a discontinued DirectX 9 benchmark suite from Futuremark. Its CPU part contains two scenarios, one dedicated to artificial intelligence pathfinding, another to game physics using PhysX package.

i7-940XM 4064
+147%
Celeron B815 1645

wPrime 32

wPrime 32M is a math multi-thread processor test, which calculates square roots of first 32 million integer numbers. Its result is measured in seconds, so that the less is benchmark result, the faster the processor.

i7-940XM 25.18
+75.9%
Celeron B815 44.3

Pros & cons summary


Recency 20 June 2010 1 January 2012
Physical cores 4 2
Threads 8 2
Chip lithography 45 nm 32 nm
Power consumption (TDP) 55 Watt 35 Watt

i7-940XM has 100% more physical cores and 300% more threads.

Celeron B815, on the other hand, has an age advantage of 1 year, a 40.6% more advanced lithography process, and 57.1% lower power consumption.

We couldn't decide between Core i7-940XM and Celeron B815. We've got no test results to judge.


Should you still have questions on choice between Core i7-940XM and Celeron B815, ask them in Comments section, and we shall answer.

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Intel Core i7-940XM
Core i7-940XM
Intel Celeron B815
Celeron B815

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Community ratings

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