Pentium 4 HT 521 vs Celeron 420

Primary details

Comparing Celeron 420 and Pentium 4 HT 521 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	Desktop processor
Architecture codename	Conroe-L (2007−2008)	Prescott (2001−2005)
Release date	June 2007 (17 years ago)	June 2005 (19 years ago)
Launch price (MSRP)	$23	no data

Detailed specifications

Celeron 420 and Pentium 4 HT 521 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	no data
Boost clock speed	1.6 GHz	2.8 GHz
L1 cache	64 KB	16 KB
L2 cache	512 KB	1 MB
L3 cache	0 KB	0 KB
Chip lithography	65 nm	90 nm
Die size	77 mm2	109 mm2
Maximum case temperature (TCase)	60 °C	no data
Number of transistors	105 million	125 million
64 bit support	+	-
Windows 11 compatibility	-	-
VID voltage range	1V-1.3375V	no data

Compatibility

Information on Celeron 420 and Pentium 4 HT 521 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
Socket	LGA775	775
Power consumption (TDP)	35 Watt	84 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Celeron 420 and Pentium 4 HT 521. 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

Celeron 420 and Pentium 4 HT 521 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 Celeron 420 and Pentium 4 HT 521 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Celeron 420 and Pentium 4 HT 521. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR1, DDR2, DDR3

Pros & cons summary

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Threads	1	2
Chip lithography	65 nm	90 nm
Power consumption (TDP)	35 Watt	84 Watt

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Should you still have questions on choice between Celeron 420 and Pentium 4 HT 521, ask them in Comments section, and we shall answer.

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