Celeron 420 vs Sempron 3400+

Celeron 420 vs Sempron 3400+ Performance Spectrum

Celeron 420

1 / 1

425

0.0%

433

+1.9%

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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.

Celeron 420 vs Sempron 3400+ 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 420 vs Sempron 3400+: Pros, Cons & Final Verdict

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

Celeron 420

2007

Why buy it

✅Draws 35W instead of 62W, a 27W reduction.

Trade-offs

❌Lower PassMark (425 vs 433).
❌Launch MSRP is still $39 MSRP, while Sempron 3400+ mostly shows up through inconsistent older-market listings.

Sempron 3400+

2005

Why buy it

Trade-offs

❌77.1% higher power demand at 62W vs 35W.

Quick Answers

So, is Sempron 3400+ better than Celeron 420?

Yes. Sempron 3400+ is the better all-around CPU here. It gives you 1.9% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Sempron 3400+ has the edge because it leads the single-thread side of this matchup with 25% higher max boost clock.

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

For streaming, content creation, and heavier multitasking, Sempron 3400+ is the stronger fit. You are getting 1.9% better PassMark, backed by 1 cores and 1 threads.

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

Sempron 3400+ is still the much better call for a fresh build. Sempron 3400+ comes in at an unclear MSRP at unclear MSRP versus $39 MSRP, and it still gives you 1.9% higher PassMark. Celeron 420 only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2007 platform. Even with 100.0% better value on paper (10.9 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on LGA775.

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

Celeron 420 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2007 vs 2005). That makes it the safer long-term bet.

Celeron 420 vs Sempron 3400+ Technical Specifications

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

Celeron 420

The Celeron 420 is manufactured by Intel. It was released in 3 June 2007 (18 years ago). It is based on the Conroe-L (2007−2008) architecture. It features 1 cores and 1 threads. Base frequency is 1.6 GHz, with boost up to 1.6 GHz. L3 cache: 0 kB. L2 cache: 512 kB (total). Built on 65 nm process technology. Socket: LGA775. Thermal design power (TDP): 35 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 425 points. Launch price was $23.

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.

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Processing Power

Both the Celeron 420 and Sempron 3400+ share an identical 1-core/1-thread configuration. Boost clocks reach 1.6 GHz on the Celeron 420 versus 2 GHz on the Sempron 3400+ — a 22.2% clock advantage for the Sempron 3400+. The Celeron 420 uses the Conroe-L (2007−2008) architecture (65 nm), while the Sempron 3400+ uses Palermo (2001−2005) (90 nm). In PassMark, the Celeron 420 scores 425 against the Sempron 3400+'s 433 — a 1.9% lead for the Sempron 3400+. Both processors carry 0 kB of L3 cache.

Feature	Celeron 420	Sempron 3400+
Cores / Threads	1 / 1	1 / 1
Boost Clock	1.6 GHz	2 GHz+25%
Base Clock	1.6 GHz	—
L3 Cache	0 kB	0 kB
L2 Cache	512 kB (total)+300%	128 kB
Process	65 nm-28%	90 nm
Architecture	Conroe-L (2007−2008)	Palermo (2001−2005)
PassMark	425	433+2%

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Memory & Platform

The Celeron 420 uses the LGA775 socket (PCIe 1.1), while the Sempron 3400+ uses 939 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Celeron 420	Sempron 3400+
Socket	LGA775	939
PCIe Generation	PCIe 1.1	PCIe 2.0+82%
Max RAM Speed	DDR2-800	—
Max RAM Capacity	16 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	0	—

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Advanced Features

Virtualization: No (Celeron 420) / not specified (Sempron 3400+). Primary use case: Celeron 420 targets Budget. Direct competitor: Celeron 420 rivals Pentium 4 2.80.