Celeron 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.

Celeron 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.

Celeron 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.

Celeron 2.80

2003

Why buy it

✅Costs $237 less on MSRP ($100 MSRP vs $337 MSRP).
✅Delivers 224.1% more PassMark for each dollar spent, at 4.3 vs 1.3 PassMark/$ ($100 MSRP vs $337 MSRP).
✅Draws 73W instead of 89W, a 16W reduction.

Trade-offs

❌Lower PassMark (428 vs 445).

Xeon 2.66

2002

Why buy it

✅+4% higher PassMark.

Trade-offs

❌Lower PassMark per dollar, at 1.3 vs 4.3 PassMark/$ ($337 MSRP vs $100 MSRP).
❌21.9% higher power demand at 89W vs 73W.

Quick Answers

So, is Celeron 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 Celeron 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?

Celeron 2.80 is the better buy right now. Celeron 2.80 comes in $237 cheaper on MSRP at $100 MSRP versus $337 MSRP, and it still gives you 5.3% higher max boost clock. The compromise is that Xeon 2.66 is still stronger for heavier multi-core work with 4% better PassMark. It is also 224.1% better value on MSRP (4.3 vs 1.3 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Celeron 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.

Celeron 2.80 vs Xeon 2.66 Technical Specifications

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

Celeron 2.80

The Celeron 2.80 is manufactured by Intel. It was released in 2007-01-01. It is based on the Northwood (2002−2004) architecture. It features 1 cores and 1 threads. Max frequency: 2.8 GHz. L3 cache: 0 kB. L2 cache: 128 kB. Built on 130 nm process technology. Socket: PGA478. Thermal design power (TDP): 73 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

Both the Celeron 2.80 and Xeon 2.66 share an identical 1-core/1-thread configuration. Boost clocks reach 2.8 GHz on the Celeron 2.80 versus 2.66 GHz on the Xeon 2.66 — a 5.1% clock advantage for the Celeron 2.80. The Celeron 2.80 uses the Northwood (2002−2004) architecture (130 nm), while the Xeon 2.66 uses Prestonia (2002) (130 nm). In PassMark, the Celeron 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	Celeron 2.80	Xeon 2.66
Cores / Threads	1 / 1	1 / 1
Boost Clock	2.8 GHz+5%	2.66 GHz
L3 Cache	0 kB	0 kB
L2 Cache	128 kB	512 kB+300%
Process	130 nm	130 nm
Architecture	Northwood (2002−2004)	Prestonia (2002)
PassMark	428	445+4%

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Memory & Platform

The Celeron 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.

Feature	Celeron 2.80	Xeon 2.66
Socket	PGA478	PGA604
PCIe Generation	PCIe 1.1	PCIe 2.0+82%
Max RAM Speed	DDR1-400	—
Max RAM Capacity	4 GB	—
RAM Channels	1	—
ECC Support	No	—
PCIe Lanes	0	—

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Advanced Features

Virtualization: No (Celeron 2.80) / not specified (Xeon 2.66). Primary use case: Celeron 2.80 targets Budget. Direct competitor: Celeron 2.80 rivals Pentium 4 2.80.

Feature	Celeron 2.80	Xeon 2.66
Integrated GPU	No	—
Unlocked	No	—
AVX-512	No	—
Virtualization	No	—
Target Use	Budget	—

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Value Analysis

At launch, the Celeron 2.80 was priced at $100, while the Xeon 2.66 came in at $337. On launch pricing ($100 vs $337), Celeron 2.80 was $237 cheaper. In terms of value on MSRP (PassMark points per dollar), the Celeron 2.80 delivers 4.3 pts/$ vs 1.3 pts/$ for the Xeon 2.66 — making the Celeron 2.80 the 105.7% better value option.

Feature	Celeron 2.80	Xeon 2.66
MSRP	$100-70%	$337
Performance per Dollar	4.3+231%	1.3
Release Date	2003	2002

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