Sempron 3400+ vs Xeon 2.66

Sempron 3400+ vs Xeon 2.66 Performance Spectrum

Sempron 3400+

1 / 1

433

0.0%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Xeon 2.66

1 / 1

445

+2.8%

Atom 230

Pentium 4 2.26

Pentium M 1.40

Mobile Pentium 4 2.66

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.

Sempron 3400+ 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.

Sempron 3400+ 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.

Sempron 3400+

2005

Why buy it

✅Draws 62W instead of 89W, a 27W reduction.

Trade-offs

❌Lower PassMark (433 vs 445).

Xeon 2.66

2002

Why buy it

Trade-offs

❌Launch MSRP is still $337 MSRP, while Sempron 3400+ mostly shows up through inconsistent older-market listings.
❌43.5% higher power demand at 89W vs 62W.

Quick Answers

So, is Xeon 2.66 better than Sempron 3400+?

Not really, because they are built for different jobs. Xeon 2.66 makes more sense for workstation-style multi-core throughput, while Sempron 3400+ is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Xeon 2.66 is the better pick. According to our tests, it delivers 0.2% more average FPS across 50 shared CPU game tests.

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 2.8% better PassMark, backed by 1 cores and 1 threads.

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

Xeon 2.66 is the better buy right now. Xeon 2.66 comes in at an unclear MSRP at $337 MSRP versus unclear MSRP, and it still gives you a 0.2% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (1.3 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Sempron 3400+ makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2005 vs 2002). That makes it the safer long-term bet.

Sempron 3400+ vs Xeon 2.66 Technical Specifications

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

Sempron 3400+

The Sempron 3400+ is manufactured by AMD. It was released in 1 October 2005 (20 years ago). It is based on the Palermo (2001−2005) architecture. It features 1 cores and 1 threads. Max frequency: 2 GHz. L3 cache: 0 kB. L2 cache: 128 kB. Built on 90 nm process technology. Socket: 939. Thermal design power (TDP): 62 Watt. Memory support: DDR1. Passmark benchmark score: 433 points. Launch price was $30.

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 Sempron 3400+ and Xeon 2.66 share an identical 1-core/1-thread configuration. Boost clocks reach 2 GHz on the Sempron 3400+ versus 2.66 GHz on the Xeon 2.66 — a 28.3% clock advantage for the Xeon 2.66. The Sempron 3400+ uses the Palermo (2001−2005) architecture (90 nm), while the Xeon 2.66 uses Prestonia (2002) (130 nm). In PassMark, the Sempron 3400+ scores 433 against the Xeon 2.66's 445 — a 2.7% lead for the Xeon 2.66. Both processors carry 0 kB of L3 cache.

Feature	Sempron 3400+	Xeon 2.66
Cores / Threads	1 / 1	1 / 1
Boost Clock	2 GHz	2.66 GHz+33%
L3 Cache	0 kB	0 kB
L2 Cache	128 kB	512 kB+300%
Process	90 nm-31%	130 nm
Architecture	Palermo (2001−2005)	Prestonia (2002)
PassMark	433	445+3%

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Memory & Platform

The Sempron 3400+ uses the 939 socket (PCIe 2.0), while the Xeon 2.66 uses PGA604 (PCIe 2.0) — making them incompatible on the same motherboard.