Mobile Pentium 4 2.80 vs Xeon 2.66

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.

Mobile Pentium 4 2.80 vs Xeon 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.

Mobile Pentium 4 2.80 vs Xeon 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.

Mobile Pentium 4 2.80

2003

Why buy it

✅Draws 68W instead of 89W, a 21W reduction.

Trade-offs

❌Lower PassMark (428 vs 445).

Xeon 2.66

2002

Why buy it

✅+4% higher PassMark.

Trade-offs

❌Launch MSRP is still $337 MSRP, while Mobile Pentium 4 2.80 mostly shows up through inconsistent older-market listings.
❌30.9% higher power demand at 89W vs 68W.

Quick Answers

So, is Mobile Pentium 4 2.80 better than Xeon 2.66?

Not really, because they are built for different jobs. Xeon 2.66 makes more sense for workstation-style multi-core throughput, while Mobile Pentium 4 2.80 is the more practical desktop choice for gaming, platform cost, and everyday use.

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

For streaming, content creation, and heavier multitasking, Xeon 2.66 is the stronger fit. You are getting 4% better PassMark, backed by 1 cores and 1 threads.

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

Mobile Pentium 4 2.80 is still the faster CPU overall, but Xeon 2.66 is easier to justify if budget matters more than peak performance. Mobile Pentium 4 2.80 comes in at an unclear MSRP at unclear MSRP versus $337 MSRP, and it still gives you 5.3% higher max boost clock. The compromise is that Xeon 2.66 is still stronger for heavier multi-core work with 4% better PassMark. Xeon 2.66 is also 100.0% better value on MSRP (1.3 vs 0.0 PassMark/$), which is why it can still make sense for tighter-budget builds on paper.

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

Mobile Pentium 4 2.80 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2003 vs 2002). That makes it the safer long-term bet.

Mobile Pentium 4 2.80 vs Xeon 2.66 Technical Specifications

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

Mobile Pentium 4 2.80

The Mobile Pentium 4 2.80 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: 2.8 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 130 nm process technology. Socket: PGA478. Thermal design power (TDP): 68 Watt. Memory support: DDR1, DDR2. Passmark benchmark score: 428 points. Launch price was $69.

Xeon 2.66

The Xeon 2.66 is manufactured by Intel. It was released in 2015-01-01. It is based on the Prestonia (2002) architecture. It features 1 cores and 1 threads. Max frequency: 2.66 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 130 nm process technology. Socket: PGA604. Thermal design power (TDP): 89 Watt. Passmark benchmark score: 445 points. Launch price was $800.

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Processing Power

The Mobile Pentium 4 2.80 packs 1 cores / 2 threads, matching the Xeon 2.66's 1 cores. Boost clocks reach 2.8 GHz on the Mobile Pentium 4 2.80 versus 2.66 GHz on the Xeon 2.66 — a 5.1% clock advantage for the Mobile Pentium 4 2.80. The Mobile Pentium 4 2.80 uses the Northwood (2002−2004) architecture (130 nm), while the Xeon 2.66 uses Prestonia (2002) (130 nm). In PassMark, the Mobile Pentium 4 2.80 scores 428 against the Xeon 2.66's 445 — a 3.9% lead for the Xeon 2.66. Both processors carry 0 kB of L3 cache.

Feature	Mobile Pentium 4 2.80	Xeon 2.66
Cores / Threads	1 / 2	1 / 1
Boost Clock	2.8 GHz+5%	2.66 GHz
L3 Cache	0 kB	0 kB
L2 Cache	512 kB	512 kB
Process	130 nm	130 nm
Architecture	Northwood (2002−2004)	Prestonia (2002)
PassMark	428	445+4%

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Memory & Platform

The Mobile Pentium 4 2.80 uses the PGA478 socket (PCIe 1.1), while the Xeon 2.66 uses PGA604 (PCIe 2.0) — making them incompatible on the same motherboard.