Athlon 64 X2 4000+ vs Core 2 Duo E8400

Athlon 64 X2 4000+ vs Core 2 Duo E8400 Performance Spectrum

Athlon 64 X2 4000+

2 / 2

1,175

+0.9%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Core 2 Duo E8400

2 / 2

1,165

0.0%

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.

Athlon 64 X2 4000+ vs Core 2 Duo E8400 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.

Athlon 64 X2 4000+ vs Core 2 Duo E8400: Pros, Cons & Final Verdict

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

Athlon 64 X2 4000+

2006

Why buy it

✅+0.9% higher PassMark.

Trade-offs

❌Launch MSRP is still $328 MSRP, while Core 2 Duo E8400 mostly shows up through inconsistent older-market listings.
❌36.9% higher power demand at 89W vs 65W.

Core 2 Duo E8400

2008

Why buy it

✅Draws 65W instead of 89W, a 24W reduction.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Lower PassMark (1,165 vs 1,175).

Quick Answers

So, is Core 2 Duo E8400 better than Athlon 64 X2 4000+?

It depends on what you want from the system. For gaming, Core 2 Duo E8400 is ahead with 50% higher max boost clock. For rendering, compiling, streaming, and heavier multitasking, Athlon 64 X2 4000+ pulls ahead with 0.9% better PassMark.

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

For streaming, content creation, and heavier multitasking, Athlon 64 X2 4000+ is the stronger fit. You are getting 0.9% better PassMark, backed by 2 cores and 2 threads.

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

Core 2 Duo E8400 is still the much better call for a fresh build. Core 2 Duo E8400 comes in at an unclear MSRP at unclear MSRP versus $328 MSRP, and it still gives you 50% higher max boost clock. Athlon 64 X2 4000+ only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2006 platform. Even with 100.0% better value on paper (3.6 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on AM2.

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

Core 2 Duo E8400 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2008 vs 2006). That makes it the safer long-term bet.

Athlon 64 X2 4000+ vs Core 2 Duo E8400 Technical Specifications

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

Athlon 64 X2 4000+

The Athlon 64 X2 4000+ is manufactured by AMD. It was released in 2009-01-01. It is based on the Windsor (2006−2007) architecture. It features 2 cores and 2 threads. Max frequency: 2 GHz. L3 cache: 0 kB. L2 cache: 512K. Built on 90 nm process technology. Socket: AM2. Thermal design power (TDP): 89 Watt. Passmark benchmark score: 1,175 points. Launch price was $149.

Core 2 Duo E8400

The Core 2 Duo E8400 is manufactured by Intel. It was released in 2008-01-01. It is based on the Wolfdale (2008−2010) architecture. It features 2 cores and 2 threads. Base frequency is 3 GHz, with boost up to 3 GHz. L3 cache: 0 kB. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA775. Thermal design power (TDP): 65 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 1,165 points. Launch price was $249.

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Processing Power

Both the Athlon 64 X2 4000+ and Core 2 Duo E8400 share an identical 2-core/2-thread configuration. Boost clocks reach 2 GHz on the Athlon 64 X2 4000+ versus 3 GHz on the Core 2 Duo E8400 — a 40% clock advantage for the Core 2 Duo E8400. The Athlon 64 X2 4000+ uses the Windsor (2006−2007) architecture (90 nm), while the Core 2 Duo E8400 uses Wolfdale (2008−2010) (45 nm). In PassMark, the Athlon 64 X2 4000+ scores 1,175 against the Core 2 Duo E8400's 1,165 — a 0.9% lead for the Athlon 64 X2 4000+. Both processors carry 0 kB of L3 cache.

Feature	Athlon 64 X2 4000+	Core 2 Duo E8400
Cores / Threads	2 / 2	2 / 2
Boost Clock	2 GHz	3 GHz+50%
Base Clock	—	3 GHz
L3 Cache	0 kB	0 kB
L2 Cache	512K+8433%	6 MB (total)
Process	90 nm	45 nm-50%
Architecture	Windsor (2006−2007)	Wolfdale (2008−2010)
PassMark	1,175	1,165
Geekbench 6 Single	195	—
Geekbench 6 Multi	380	—

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Memory & Platform

The Athlon 64 X2 4000+ uses the AM2 socket (PCIe 1.1), while the Core 2 Duo E8400 uses LGA775 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR2-800 on the Athlon 64 X2 4000+ versus 1333 on the Core 2 Duo E8400 — the Core 2 Duo E8400 supports 66.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core 2 Duo E8400 supports up to 16 GB of RAM compared to 4 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 0 (Athlon 64 X2 4000+) vs 16 (Core 2 Duo E8400) — the Core 2 Duo E8400 offers 16 more lanes for additional GPUs or NVMe drives. Chipset compatibility: nForce 500,AMD 690G (Athlon 64 X2 4000+) and P35,G31,G33,P45 (Core 2 Duo E8400).

Feature	Athlon 64 X2 4000+	Core 2 Duo E8400
Socket	AM2	LGA775
PCIe Generation	PCIe 1.1	PCIe 1.1
Max RAM Speed	DDR2-800	1333+67%
Max RAM Capacity	4 GB	16 GB+300%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	0	16

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Advanced Features

Neither processor supports overclocking. Virtualization support: AMD-V (Athlon 64 X2 4000+) vs true (Core 2 Duo E8400). Primary use case: Athlon 64 X2 4000+ targets Legacy Desktop. Direct competitor: Core 2 Duo E8400 rivals Phenom II X2 550.