Athlon XP 2800+ vs Mobile Pentium 4 2.66

Athlon XP 2800+ vs Mobile Pentium 4 2.66 Performance Spectrum

Athlon XP 2800+

1 / 1

380

0.0%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Mobile Pentium 4 2.66

1 / 2

395

+3.9%

About PassMark

PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.

Athlon XP 2800+ vs Mobile Pentium 4 2.66 FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with GeForce RTX 5090 to isolate CPU performance.

Search any supported game below to compare 1080p FPS for both components.

Athlon XP 2800+ vs Mobile Pentium 4 2.66: Pros, Cons & Final Verdict

See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.

Athlon XP 2800+

2001

Why buy it

✅Includes a boxed cooler (Stock), unlike Mobile Pentium 4 2.66.

Trade-offs

❌Lower Geekbench single-core performance for gaming (250 vs 800).
❌Lower Geekbench multi-core (250 vs 800).
❌Launch MSRP is still $375 MSRP, while Mobile Pentium 4 2.66 mostly shows up through inconsistent older-market listings.

Mobile Pentium 4 2.66

2003

Why buy it

✅+220% higher Geekbench single-core performance for gaming and desktop responsiveness.
✅Draws 66W instead of 74W, a 8W reduction.

Trade-offs

❌No boxed cooler included, unlike Athlon XP 2800+.

Quick Answers

So, is Mobile Pentium 4 2.66 better than Athlon XP 2800+?

Yes. Mobile Pentium 4 2.66 is the better all-around CPU here. It gives you a 0.2% average FPS lead across 47 shared CPU game tests in our data, 220% better Geekbench multi-core, 3.9% higher PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Mobile Pentium 4 2.66 is the better pick. According to our tests, it delivers 0.2% more average FPS across 47 shared CPU game tests.

Which one is better for streaming, content creation, and heavy multitasking?

For streaming, content creation, and heavier multitasking, Mobile Pentium 4 2.66 is the stronger fit. You are getting 220% better Geekbench multi-core, backed by 1 cores and 2 threads.

Which one is the smarter buy today, not just the cheaper CPU?

Mobile Pentium 4 2.66 is still the much better call for a fresh build. Mobile Pentium 4 2.66 comes in at an unclear MSRP at unclear MSRP versus $375 MSRP, and it still gives you a 0.2% average FPS lead across 47 shared CPU game tests in our data. Athlon XP 2800+ only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2001 platform. Even with 100.0% better value on paper (1.0 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on A.

Which one is more future-proof for 2026 and beyond?

Mobile Pentium 4 2.66 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2003 vs 2001) and more multi-core headroom with 1 cores / 2 threads instead of 1/1. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Athlon XP 2800+ vs Mobile Pentium 4 2.66 Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

Athlon XP 2800+

The Athlon XP 2800+ is manufactured by AMD. It was released in 2009-01-01. It is based on the Barton (2001−2004) architecture. It features 1 cores and 1 threads. Max frequency: 2.25 GHz. L3 cache: 0 kB. L2 cache: 512K. Built on 130 nm process technology. Socket: A. Thermal design power (TDP): 74 Watt. Passmark benchmark score: 380 points. Launch price was $149.

Mobile Pentium 4 2.66

The Mobile Pentium 4 2.66 is manufactured by Intel. It was released in Junho 2003 (22 years ago). It is based on the Northwood (2002−2004) architecture. It features 1 cores and 2 threads. Max frequency: 2.67 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 130 nm process technology. Socket: PGA478. Thermal design power (TDP): 66 Watt. Memory support: DDR1, DDR2. Passmark benchmark score: 395 points. Launch price was $69.

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Processing Power

The Athlon XP 2800+ packs 1 cores / 1 threads, matching the Mobile Pentium 4 2.66's 1 cores. Boost clocks reach 2.25 GHz on the Athlon XP 2800+ versus 2.67 GHz on the Mobile Pentium 4 2.66 — a 17.1% clock advantage for the Mobile Pentium 4 2.66. The Athlon XP 2800+ uses the Barton (2001−2004) architecture (130 nm), while the Mobile Pentium 4 2.66 uses Northwood (2002−2004) (130 nm). In PassMark, the Athlon XP 2800+ scores 380 against the Mobile Pentium 4 2.66's 395 — a 3.9% lead for the Mobile Pentium 4 2.66. Geekbench 6 single-core — the metric most relevant to gaming — records 250 vs 800, a 104.8% lead for the Mobile Pentium 4 2.66 that directly translates to higher frame rates. Multi-core Geekbench: 250 vs 800 (104.8% advantage for the Mobile Pentium 4 2.66). Both processors carry 0 kB of L3 cache.

Feature	Athlon XP 2800+	Mobile Pentium 4 2.66
Cores / Threads	1 / 1	1 / 2
Boost Clock	2.25 GHz	2.67 GHz+19%
L3 Cache	0 kB	0 kB
L2 Cache	512K	512 kB
Process	130 nm	130 nm
Architecture	Barton (2001−2004)	Northwood (2002−2004)
PassMark	380	395+4%
Geekbench 6 Single	250	800+220%
Geekbench 6 Multi	250	800+220%

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Memory & Platform

The Athlon XP 2800+ uses the A socket (PCIe 1.1), while the Mobile Pentium 4 2.66 uses PGA478 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR-333 on the Athlon XP 2800+ versus DDR2 on the Mobile Pentium 4 2.66 — the Mobile Pentium 4 2.66 supports -100.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Mobile Pentium 4 2.66 supports up to 4 GB of RAM compared to 2 GB — 100% more capacity for professional workloads. Both feature 1-channel memory with ECC support. Both provide 0 PCIe lanes. Chipset compatibility: KT400,nForce2 Ultra 400 (Athlon XP 2800+) and 852PM,855PM (Mobile Pentium 4 2.66).

Feature	Athlon XP 2800+	Mobile Pentium 4 2.66
Socket	A	PGA478
PCIe Generation	PCIe 1.1	PCIe 1.1
Max RAM Speed	DDR-333	DDR2
Max RAM Capacity	2 GB	4 GB+100%
RAM Channels	1	1
ECC Support	No	No
PCIe Lanes	0	0

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Advanced Features

Only the Athlon XP 2800+ has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support None virtualization. Primary use case: Athlon XP 2800+ targets Legacy Desktop, Mobile Pentium 4 2.66 targets Legacy Laptop.