Pentium III 866 vs Atom Z550

Primary details

Comparing Atom Z550 and Pentium III 866 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	3177	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Desktop processor
Series	Intel Atom	no data
Power efficiency	9.46	no data
Architecture codename	Silverthorne (2008−2010)	Coppermine T (2000)
Release date	8 April 2009 (15 years ago)	20 March 2000 (24 years ago)

Detailed specifications

Atom Z550 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	1
Base clock speed	2 GHz	no data
Boost clock speed	2 GHz	0.87 GHz
Bus type	FSB	no data
Bus rate	533.33 MT/s	no data
Multiplier	15	no data
L1 cache	56 KB (per core)	32 KB
L2 cache	512 KB (per core)	256 KB
L3 cache	0 KB	0 KB
Chip lithography	45 nm	180 nm
Die size	26 mm2	106 mm2
Maximum core temperature	90 °C	no data
Maximum case temperature (TCase)	no data	80 °C
Number of transistors	47 million	28 million
64 bit support	-	-
Windows 11 compatibility	-	-

Compatibility

Information on Atom Z550 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)	2
Socket	PBGA441	370
Power consumption (TDP)	2.4 Watt	27 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Atom Z550 and Pentium III 866. You'll probably need this information if you require some particular technology.

Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	-	no data
Hyper-Threading Technology	+	no data
Idle States	+	no data
Thermal Monitoring	+	-
Demand Based Switching	+	no data
FSB parity	-	no data

Security technologies

Atom Z550 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 Z550 and Pentium III 866 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Atom Z550 and Pentium III 866. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

unknown

no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

On certain motherboards (Chipset feature)

On certain motherboards (Chipset feature)

Pros & cons summary

---

Recency	8 April 2009	20 March 2000
Threads	2	1
Chip lithography	45 nm	180 nm
Power consumption (TDP)	2 Watt	27 Watt

---

Should you still have questions on choice between Atom Z550 and Pentium III 866, 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.

---