Celeron B840 vs Core 2 Duo P8400

Place in the ranking	2841	2785
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Laptop
Series	Intel Core 2 Duo	Intel Celeron
Power efficiency	2.01	1.65
Architecture codename	Penryn (2008−2011)	Sandy Bridge (2011−2013)
Release date	15 July 2008 (16 years ago)	1 July 2011 (13 years ago)
Launch price (MSRP)	$209	$86

Detailed specifications

Core 2 Duo P8400 and Celeron B840 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	2.26 GHz	1.9 GHz
Boost clock speed	2.26 GHz	1.9 GHz
Bus type	no data	DMI 2.0
Bus rate	1066 MHz	4 × 5 GT/s
Multiplier	no data	19
L1 cache	128 KB	64K (per core)
L2 cache	3 MB	256K (per core)
L3 cache	3 MB L2 Cache	2 MB (shared)
Chip lithography	45 nm	32 nm
Die size	107 mm²	131 mm²
Maximum core temperature	105 °C	100 °C
Number of transistors	410 Million	504 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.05V-1.15V	no data

Compatibility

Information on Core 2 Duo P8400 and Celeron B840 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	no data	1 (Uniprocessor)
Socket	BGA479,PBGA479,PGA478	FCPGA988,PGA988
Power consumption (TDP)	25 Watt	35 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Duo P8400 and Celeron B840. You'll probably need this information if you require some particular technology.

FMA	-	+
Enhanced SpeedStep (EIST)	+	+
My WiFi	no data	+
Turbo Boost Technology	-	-
Hyper-Threading Technology	-	-
Idle States	+	+
Thermal Monitoring	-	+
Flex Memory Access	no data	+
Demand Based Switching	-	-
FDI	no data	+
Fast Memory Access	no data	+
FSB parity	-	no data

Security technologies

Core 2 Duo P8400 and Celeron B840 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+
Anti-Theft	no data	-

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Duo P8400 and Celeron B840 are enumerated here.

VT-d	no data	-
VT-x	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Duo P8400 and Celeron B840. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	no data	DDR3
Maximum memory size	no data	16 GB
Max memory channels	no data	2
Maximum memory bandwidth	no data	21.335 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	no data	Intel® HD Graphics for 2nd Generation Intel® Processors
Graphics max frequency	no data	1 GHz

Graphics interfaces

Available interfaces and connections of Core 2 Duo P8400 and Celeron B840 integrated GPUs.

Number of displays supported	no data	2
eDP	no data	+
DisplayPort	-	+
HDMI	-	+
SDVO	no data	+
CRT	no data	+

Peripherals

Specifications and connection of peripherals supported by Core 2 Duo P8400 and Celeron B840.

PCIe version	no data	2.0
PCI Express lanes	no data	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.

Core 2 Duo P8400 0.53

Celeron B840 0.61
+15.1%

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.

Core 2 Duo P8400 849

Celeron B840 967
+13.9%

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.

Core 2 Duo P8400 280

Celeron B840 328
+17.1%

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.

Core 2 Duo P8400 468

Celeron B840 597
+27.6%

Gaming performance

Pros & cons summary

Performance score	0.53	0.61
Recency	15 July 2008	1 July 2011
Chip lithography	45 nm	32 nm
Power consumption (TDP)	25 Watt	35 Watt

Core 2 Duo P8400 has 40% lower power consumption.

Celeron B840, on the other hand, has a 15.1% higher aggregate performance score, an age advantage of 2 years, and a 40.6% more advanced lithography process.

The Celeron B840 is our recommended choice as it beats the Core 2 Duo P8400 in performance tests.

Should you still have questions on choice between Core 2 Duo P8400 and Celeron B840, ask them in Comments section, and we shall answer.