Intel SL7PR Pentium 4 2.80 GHz Processor

Name: Intel SL7PR Pentium 4 2.80 GHz Processor
Brand: Intel
SKU: SL7PR

Overview

The Intel SL7PR is a Pentium 4 processor running at 2.80 GHz on the Prescott core with E0 stepping — identified by its CPUID string 0F41h — built on Intel's 90nm manufacturing process in an LGA775 package. The 800 MHz front-side bus (FSB) represents the highest FSB speed available on the Pentium 4 platform, paired with a 14x bus/core multiplier to achieve the 2.80 GHz operating frequency. The 1MB L2 cache running at full core speed was Prescott's headline improvement over the Northwood predecessor, and the E0 stepping introduced thermal improvements that modestly reduced the heat density of earlier Prescott revisions — the 84W TDP and 67.7°C thermal specification still require a capable LGA775-rated cooler for stable operation. Hyper-Threading presents the single physical core as two logical processors, which provides throughput benefits in HT-aware workloads under period-appropriate operating systems.

This processor has a single relevant use case in 2024: maintaining or restoring existing LGA775-based systems where a Pentium 4 CPU has failed and a like-for-like replacement is required. It is also appropriate for enthusiasts building period-accurate systems documenting mid-2000s computing. The NetBurst microarchitecture that Prescott represents is historically notable for prioritizing clock speed scaling over instructions-per-clock efficiency — a design direction that Intel reversed decisively with the Core microarchitecture in 2006. By any modern performance metric, the SL7PR is far below current CPU capabilities. Its value is categorical: it is the correct part for the correct socket on the correct platform, sourced for a specific system that requires it. Verify motherboard BIOS compatibility for the E0 stepping before installation, and pair with an 800 MHz FSB-rated DDR2 platform for stable operation.

Key Features

CPU Speed: 2.80 GHz; PCG: 04A; Bus Speed: 800 MHz

Bus/Core Ratio: 14; L2 Cache Size: 1 MB; L2 Cache Speed: 2.80 GHz

Package Type: LGA775; Manufacturing Technology: 90 nm

Core Stepping: E0; CPUID String: 0F41h

Thermal Design Power: 84W; Thermal Specification: 67.7°C; VID Voltage Range: 1.4V

Specifications

Processor

Intel Pentium 4 (Prescott Core)

Clock Speed

2.80 GHz

FSB Speed

800 MHz

Bus/Core Ratio

14x

L2 Cache

1MB (at 2.80 GHz)

Socket

LGA775

Manufacturing Process

90nm

Core Stepping

E0

CPUID

0F41h

TDP

84W

Max Thermal Spec

67.7°C

VID Voltage Range

1.4V

PCG

04A

S-Spec

SL7PR

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Pros & Cons

👍 Pros

The E0 stepping of the SL7PR addressed thermal improvements over earlier Prescott steppings, offering marginally better stability under sustained load compared to earlier D0/C0 stepping Pentium 4 processors
800 MHz FSB is the highest front-side bus speed available on LGA775 Pentium 4 platforms, matching the maximum memory bandwidth the DDR2 controller on 915/945-era motherboards can deliver
LGA775 package type provides a socket interface advantage over earlier Socket 478 Pentium 4 processors — LGA contacts on the motherboard are more resilient to damage than pin-based CPU packages
Hyper-Threading support makes the single core appear as two logical processors, providing measurable throughput gains in HT-aware applications on period-appropriate operating systems
At 14x bus/core ratio with a 200 MHz base clock, the SL7PR's multiplier and bus configuration are well-understood for LGA775 platform stability testing and legacy build documentation

👎 Cons

The NetBurst microarchitecture delivers significantly lower instructions-per-clock than contemporary Athlon 64 and subsequent Core 2 Duo processors — raw throughput at 2.80 GHz is uncompetitive even against slower-clocked modern alternatives
84W TDP generates substantial heat for a single core — thermal management requirements are higher than any modern efficient processor, increasing cooler cost and system noise
The 90nm manufacturing process is end-of-life legacy silicon with no upgrade path — this CPU represents a closed ecosystem with no future performance headroom on the LGA775 platform
1MB L2 cache, while improved over earlier Northwood Pentium 4 designs, is insufficient for workloads that benefit from larger cache capacities available in contemporary and successor CPUs
VID Voltage Range of 1.4V is high by modern standards, contributing to elevated power consumption relative to workload throughput — efficiency ratios are significantly worse than any post-2008 Intel platform

Frequently Asked Questions

What socket does the SL7PR use, and which motherboards is it compatible with?

The SL7PR is an LGA775 processor, compatible with Intel 915, 925, 945, 955, and 975 Express chipset-based motherboards that support the 800 MHz FSB. Not all LGA775 boards support Prescott-core Pentium 4 processors — consult your motherboard's CPU compatibility list and ensure BIOS revision supports the E0 stepping (CPUID 0F41h) before installing.

What is the 84W TDP of the SL7PR in practical terms — what cooling requirements does it impose?

At 84W, the SL7PR runs significantly hotter than modern processors with equivalent workload throughput. It requires a heatsink and fan rated for Socket 775 with at least 84W thermal dissipation capacity. The 67.7°C maximum thermal specification means inadequate cooling will cause thermal throttling and reduced stability. Do not run this CPU without a verified compatible cooler.

Does the SL7PR support Hyper-Threading, and how does that affect multi-threaded software performance?

Pentium 4 Prescott-core processors include Hyper-Threading Technology, which presents the single physical core as two logical processors to the operating system. This can improve throughput in applications designed for multi-threaded execution (video encoding, file compression) but does not substitute for a true second core — modern workloads expecting actual multi-core performance will not benefit significantly.

What L2 cache size does the SL7PR have, and how does it compare to competing CPUs of the same era?

The SL7PR has 1MB of L2 cache running at the full 2.80 GHz core speed. Compared to AMD Athlon 64 processors of the same era (which offered 512KB or 1MB L2 with architectural efficiency advantages), the Pentium 4's NetBurst architecture required higher cache sizes and clock speeds to compete — the 1MB cache at this clock was a significant Prescott improvement over earlier Northwood-core Pentium 4s.

Is the SL7PR compatible with Windows 10 or modern operating systems?

Windows 10 requires a minimum of SSE2 instruction support, which the Pentium 4 SL7PR provides. However, Microsoft has not certified LGA775 Pentium 4 processors for Windows 10 deployment, and driver availability for period-era motherboards under Windows 10 is inconsistent. For practical legacy system use, Windows XP or Windows 7 32-bit are the appropriate operating systems for this platform.