Pentium III 866 vs Atom Z520

Primary details

Comparing Atom Z520 and Pentium III 866 processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	not rated	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Desktop processor
Series	Intel Atom	no data
Architecture codename	Silverthorne (2008−2010)	Coppermine T (2001)
Release date	2 April 2008 (16 years ago)	no data
Launch price (MSRP)	$65	no data
Current price	$217 (3.3x MSRP)	$19.16

Detailed specifications

Atom Z520 and Pentium III 866 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	2	no data
Base clock speed	1.33 GHz	no data
Boost clock speed	0.03 GHz	0.87 GHz
Bus support	533.33 MT/s	no data
L1 cache	56 KB	8 KB
L2 cache	512 KB	256 KB
L3 cache	0 KB	0 KB
Chip lithography	45 nm	180 nm
Die size	24.18 mm27.8 mm × 3.1 mm	80 mm2
Maximum core temperature	90 °C	no data
Maximum case temperature (TCase)	no data	69 °C
Number of transistors	47 Million	44 million
64 bit support	-	-
Windows 11 compatibility	-	-
Unlocked multiplier	No	No
VID voltage range	0.75-1.1V	no data

Compatibility

Information on Atom Z520 and Pentium III 866 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
Socket	PBGA441	370
Power consumption (TDP)	2 Watt	38 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Atom Z520 and Pentium III 866. You'll probably need this information if you require some particular technology.

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

Security technologies

Atom Z520 and Pentium III 866 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	no data
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Atom Z520 and Pentium III 866 are enumerated here.

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

Pros & cons summary

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Chip lithography	45 nm	180 nm
Power consumption (TDP)	2 Watt	38 Watt

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Should you still have questions on choice between Atom Z520 and Pentium III 866, ask them in Comments section, and we shall answer.

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