Celeron B815 vs B840

Place in the ranking	2787	2923
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Laptop
Series	Intel Celeron	Intel Celeron
Power efficiency	1.65	1.24
Architecture codename	Sandy Bridge (2011−2013)	Sandy Bridge (2011−2013)
Release date	1 July 2011 (13 years ago)	1 January 2012 (12 years ago)
Launch price (MSRP)	$86	$86

Detailed specifications

Celeron B840 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 cores	2 (Dual-core)	2 (Dual-core)
Threads	2	2
Base clock speed	1.9 GHz	1.6 GHz
Boost clock speed	1.9 GHz	1.6 GHz
Bus type	DMI 2.0	DMI 2.0
Bus rate	4 × 5 GT/s	4 × 5 GT/s
Multiplier	19	16
L1 cache	64K (per core)	64K (per core)
L2 cache	256K (per core)	256K (per core)
L3 cache	2 MB (shared)	2 MB (shared)
Chip lithography	32 nm	32 nm
Die size	131 mm²	131 mm²
Maximum core temperature	100 °C	100 °C
Number of transistors	504 million	504 million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Celeron B840 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 configuration	1 (Uniprocessor)	1 (Uniprocessor)
Socket	FCPGA988,PGA988	FCPGA988,PGA988
Power consumption (TDP)	35 Watt	35 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Celeron B840 and Celeron B815. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE4.1, Intel® SSE4.2
FMA	+	+
Enhanced SpeedStep (EIST)	+	+
My WiFi	+	-
Turbo Boost Technology	-	-
Hyper-Threading Technology	-	-
Idle States	+	+
Thermal Monitoring	+	+
Flex Memory Access	+	+
Demand Based Switching	-	-
FDI	+	+
Fast Memory Access	+	+

Security technologies

Celeron B840 and Celeron B815 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	-
EDB	+	+
Anti-Theft	-	-

Virtualization technologies

Virtual machine speed-up technologies supported by Celeron B840 and Celeron B815 are enumerated here.

VT-d	-	-
VT-x	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Celeron B840 and Celeron B815. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3
Maximum memory size	16 GB	16 GB
Max memory channels	2	2
Maximum memory bandwidth	21.335 GB/s	21.335 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel® HD Graphics for 2nd Generation Intel® Processors	Intel® HD Graphics for 2nd Generation Intel® Processors
Clear Video HD	-	-
Graphics max frequency	1 GHz	1.05 GHz
InTru 3D	-	-

Graphics interfaces

Available interfaces and connections of Celeron B840 and Celeron B815 integrated GPUs.

Number of displays supported	2	2
eDP	+	+
DisplayPort	+	+
HDMI	+	+
SDVO	+	+
CRT	+	+

Peripherals

Specifications and connection of peripherals supported by Celeron B840 and Celeron B815.

PCIe version	2.0	2.0
PCI Express lanes	16	16

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.

Celeron B840 0.61
+32.6%

Celeron B815 0.46

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.

Celeron B840 967
+32.3%

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.

Celeron B840 328
+35%

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.

Celeron B840 597
+44.6%

Celeron B815 413