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Square ceramic processor with gold contacts and printed model 521

Intel

Intel Pentium 4 521 2.80 GHz desktop processor OEM

SKU CH-CNQ1-9TF6D

Single-core desktop processor running at 2.80 GHz with 1 MB L2 cache for Socket T LGA-775 systems

  • Processor classDesktop
  • Single-core design handles basic computing tasks efficiently
  • 80 GHz clock speed delivers responsive performance for everyday applications
  • 1 MB L2 cache reduces memory latency for smoother operation
  • 64-bit processing capability supports modern operating systems and software
  • 90 nm manufacturing process with 84 W thermal design fits Socket T LGA-775 motherboards

Pentium 4 521 single-core 2.80 GHz

This Intel Pentium 4 521 desktop processor runs at 2.80 GHz on a 90 nm process with 1 MB L2 cache. It uses the LGA 775 socket and provides 64-bit processing capability. The OEM package includes the processor only.

Suits legacy LGA 775 maintenance

This CPU fits existing Socket T motherboards needing a direct replacement. It is not suited for multi-threaded applications, modern operating systems or tasks requiring multiple cores. Buyers building new systems should consider current platforms.

1 MB L2 cache and 2.80 GHz clock speed

The single core handles simple office tasks, legacy software and light embedded workloads within its 84 W thermal envelope. Performance runs out quickly with concurrent processes, modern browsers or any multi-threaded demand.

How it compares

Measured against everything we stock in Desktop Processors, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 99% of the 494 comparable items (median $149.99).

New to this? Buying a processor with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Processor
Processor classDesktop

Questions about this item

Will this CPU fit my LGA 775 motherboard?

Yes, the Pentium 4 521 uses the Socket T LGA-775 interface, so it installs directly into any motherboard with that socket.

What does the 90 nm figure mean for my build?

The 90 nm process indicates the transistor size; it generally correlates with the processor's thermal characteristics and power draw for a 2.80 GHz single-core design.

Is a cooler included in the OEM pack?

OEM packaging typically contains only the processor itself; a compatible LGA-775 heatsink and fan must be sourced separately.

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