Atom Z520 vs Celeron 420

Primary details

Comparing Celeron 420 and Atom Z520 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	no data	Intel Atom
Architecture codename	Conroe-L (2007−2008)	Silverthorne (2008−2010)
Release date	June 2007 (17 years ago)	2 April 2008 (16 years ago)
Launch price (MSRP)	$23	$65

Detailed specifications

Celeron 420 and Atom Z520 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	1 (Single-Core)	1 (Single-Core)
Threads	1	2
Base clock speed	1.6 GHz	1.33 GHz
Boost clock speed	1.6 GHz	0.03 GHz
Bus type	no data	FSB
Bus rate	no data	533.33 MT/s
Multiplier	no data	10
L1 cache	64 KB	56 KB
L2 cache	512 KB	512 KB
L3 cache	0 KB	0 KB
Chip lithography	65 nm	45 nm
Die size	77 mm2	24.18 mm2
Maximum core temperature	no data	90 °C
Maximum case temperature (TCase)	60 °C	no data
Number of transistors	105 million	47 Million
64 bit support	+	-
Windows 11 compatibility	-	-
VID voltage range	1V-1.3375V	0.75-1.1V

Compatibility

Information on Celeron 420 and Atom Z520 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	LGA775	PBGA441
Power consumption (TDP)	35 Watt	2 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Celeron 420 and Atom Z520. 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	+	+
Thermal Monitoring	+	+
Demand Based Switching	-	+
FSB parity	-	-
Status	Discontinued	Discontinued

Security technologies

Celeron 420 and Atom Z520 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Celeron 420 and Atom Z520 are enumerated here.

VT-d	-	-
VT-x	-	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Celeron 420 and Atom Z520. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

no data

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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Pros & cons summary

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Threads	1	2
Chip lithography	65 nm	45 nm
Power consumption (TDP)	35 Watt	2 Watt

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Should you still have questions on choice between Celeron 420 and Atom Z520, ask them in Comments section, and we shall answer.

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