Atom N455 vs Pentium D 820

Primary details

Comparing Pentium D 820 and Atom N455 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Laptop
Series	Pentium D	Intel Atom
Architecture codename	Smithfield (2005)	Pinetrail (2009−2011)
Release date	May 2005 (19 years ago)	1 June 2010 (14 years ago)
Launch price (MSRP)	no data	$64

Detailed specifications

Pentium D 820 and Atom N455 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)	1 (Single-Core)
Threads	2	2
Base clock speed	2.8 GHz	1.66 GHz
Boost clock speed	2.8 GHz	1.67 GHz
Bus rate	800 MHz	533 MHz
L1 cache	28 KB	64 KB (per core)
L2 cache	2 MB	512K (per core)
L3 cache	0 KB	0 KB
Chip lithography	90 nm	45 nm
Die size	206 mm2	66 mm2
Maximum core temperature	64 °C	100 °C
Number of transistors	169 million	123 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.2V-1.4V	no data

Compatibility

Information on Pentium D 820 and Atom N455 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	2	1
Socket	PLGA775	FCBGA559
Power consumption (TDP)	95 Watt	6.5 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 820 and Atom N455. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE2, Intel® SSE3, Intel® SSSE3
Enhanced SpeedStep (EIST)	-	+
Turbo Boost Technology	-	-
Hyper-Threading Technology	-	+
Idle States	+	no data
Thermal Monitoring	-	+
Demand Based Switching	-	-
PAE	32 Bit	no data
FSB parity	-	no data

Security technologies

Pentium D 820 and Atom N455 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Pentium D 820 and Atom N455 are enumerated here.

VT-d	-	-
VT-x	-	-

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 820 and Atom N455. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR1, DDR2, DDR3	DDR3
Maximum memory size	no data	2 GB
Max memory channels	no data	1

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

Intel GMA 3150

Synthetic benchmark performance

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

---

---

Pros & cons summary

---

Physical cores	2	1
Chip lithography	90 nm	45 nm
Power consumption (TDP)	95 Watt	6 Watt

---

Should you still have questions on choice between Pentium D 820 and Atom N455, ask them in Comments section, and we shall answer.

Vote for your favorite

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU.

---