Atom Z550 vs Pentium 4 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.

Atom Z550 vs 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.

Atom Z550 vs 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.

Atom Z550

2009

Why buy it

✅Draws 2W instead of 110W, a 108W reduction.

Trade-offs

❌Lower PassMark (375 vs 378).

Pentium 4 2.66

2002

Why buy it

Trade-offs

❌Launch MSRP is still $300 MSRP, while Atom Z550 mostly shows up through inconsistent older-market listings.
❌4483.3% higher power demand at 110W vs 2.4W.

Quick Answers

So, is Pentium 4 2.66 better than Atom Z550?

Yes. Pentium 4 2.66 is the better all-around CPU here. It gives you 0.8% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Pentium 4 2.66 has the edge because it leads the single-thread side of this matchup with 33% higher max boost clock.

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

For streaming, content creation, and heavier multitasking, Pentium 4 2.66 is the stronger fit. You are getting 0.8% better PassMark, backed by 1 cores and 1 threads.

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

Pentium 4 2.66 is the better buy right now. Pentium 4 2.66 comes in at an unclear MSRP at $300 MSRP versus unclear MSRP, and it still gives you 0.8% higher PassMark. It is also 100.0% better value on MSRP (1.3 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Atom Z550 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2009 vs 2002). That makes it the safer long-term bet.

Atom Z550 vs Pentium 4 2.66 Technical Specifications

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

Atom Z550

The Atom Z550 is manufactured by Intel. It was released in 8 April 2009 (16 years ago). It is based on the Silverthorne (2008−2010) architecture. It features 1 cores and 2 threads. Base frequency is 2 GHz, with boost up to 2 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: PBGA441. Thermal design power (TDP): 2.4 Watt. Memory support: unknown. Passmark benchmark score: 375 points. Launch price was $69.

Pentium 4 2.66

The Pentium 4 2.66 is manufactured by Intel. It was released in 2007-01-01. It is based on the NetBurst (2000−2006) 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: PGA478. Thermal design power (TDP): 110 Watt. Memory support: DDR1, DDR2. Passmark benchmark score: 378 points. Launch price was $69.

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Processing Power

The Atom Z550 packs 1 cores / 2 threads, matching the Pentium 4 2.66's 1 cores. Boost clocks reach 2 GHz on the Atom Z550 versus 2.66 GHz on the Pentium 4 2.66 — a 28.3% clock advantage for the Pentium 4 2.66. The Atom Z550 uses the Silverthorne (2008−2010) architecture (45 nm), while the Pentium 4 2.66 uses NetBurst (2000−2006) (130 nm). In PassMark, the Atom Z550 scores 375 against the Pentium 4 2.66's 378 — a 0.8% lead for the Pentium 4 2.66. Both processors carry 0 kB of L3 cache.

Feature	Atom Z550	Pentium 4 2.66
Cores / Threads	1 / 2	1 / 1
Boost Clock	2 GHz	2.66 GHz+33%
Base Clock	2 GHz	—
L3 Cache	0 kB	0 kB
L2 Cache	512 kB (per core)	512 kB
Process	45 nm-65%	130 nm
Architecture	Silverthorne (2008−2010)	NetBurst (2000−2006)
PassMark	375	378

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Memory & Platform

The Atom Z550 uses the PBGA441 socket (PCIe 2.0), while the Pentium 4 2.66 uses PGA478 (PCIe 1.1) — making them incompatible on the same motherboard.