Athlon II X2 255 vs Phenom X3 8450

Athlon II X2 255 vs Phenom X3 8450 Performance Spectrum

Athlon II X2 255

2 / 2

1,210

0.0%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Phenom X3 8450

3 / 3

1,221

+0.9%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

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 II X2 255 vs Phenom X3 8450 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 II X2 255 vs Phenom X3 8450: Pros, Cons & Final Verdict

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

Athlon II X2 255

2010

Why buy it

✅Costs $85 less on MSRP ($60 MSRP vs $145 MSRP).
✅Delivers 139.5% more PassMark for each dollar spent, at 20.2 vs 8.4 PassMark/$ ($60 MSRP vs $145 MSRP).
✅Draws 65W instead of 95W, a 30W reduction.
✅Includes a boxed cooler (Stock), unlike Phenom X3 8450.

Trade-offs

❌Lower PassMark (1,210 vs 1,221).

Phenom X3 8450

2008

Why buy it

✅+0.9% higher PassMark.

Trade-offs

❌Lower PassMark per dollar, at 8.4 vs 20.2 PassMark/$ ($145 MSRP vs $60 MSRP).
❌46.2% higher power demand at 95W vs 65W.
❌No boxed cooler included, unlike Athlon II X2 255.

Quick Answers

So, is Athlon II X2 255 better than Phenom X3 8450?

It depends on what you want from the system. For gaming, Athlon II X2 255 is ahead with a 1.2% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Phenom X3 8450 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, Phenom X3 8450 is the stronger fit. You are getting 0.9% better PassMark, backed by 3 cores and 3 threads.

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

Athlon II X2 255 is the better buy right now. Athlon II X2 255 comes in $85 cheaper on MSRP at $60 MSRP versus $145 MSRP, and it still gives you a 1.2% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Phenom X3 8450 is still stronger for heavier multi-core work with 0.9% better PassMark. It is also 139.5% better value on MSRP (20.2 vs 8.4 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Athlon II X2 255 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2010 vs 2008). That makes it the safer long-term bet.

Athlon II X2 255 vs Phenom X3 8450 Technical Specifications

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

Athlon II X2 255

The Athlon II X2 255 is manufactured by AMD. It was released in 25 January 2010 (15 years ago). It is based on the Regor (2009−2013) architecture. It features 2 cores and 2 threads. Base frequency is 3.1 GHz, with boost up to 3.1 GHz. L3 cache: 0 kB. L2 cache: 1 MB. Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 65 Watt. Memory support: DDR3. Passmark benchmark score: 1,210 points. Launch price was $60.

Phenom X3 8450

The Phenom X3 8450 is manufactured by AMD. It was released in 2009-01-01. It is based on the Toliman (2008) architecture. It features 3 cores and 3 threads. Max frequency: 2.1 GHz. L3 cache: 2 MB (total). L2 cache: 512 kB (per core). Built on 65 nm process technology. Socket: AM2+. Thermal design power (TDP): 95 Watt. Passmark benchmark score: 1,221 points. Launch price was $149.

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Processing Power

The Athlon II X2 255 packs 2 cores / 2 threads, while the Phenom X3 8450 offers 3 cores / 3 threads — the Phenom X3 8450 has 1 more core. Boost clocks reach 3.1 GHz on the Athlon II X2 255 versus 2.1 GHz on the Phenom X3 8450 — a 38.5% clock advantage for the Athlon II X2 255. The Athlon II X2 255 uses the Regor (2009−2013) architecture (45 nm), while the Phenom X3 8450 uses Toliman (2008) (65 nm). In PassMark, the Athlon II X2 255 scores 1,210 against the Phenom X3 8450's 1,221 — a 0.9% lead for the Phenom X3 8450. L3 cache: 0 kB on the Athlon II X2 255 vs 2 MB (total) on the Phenom X3 8450.

Feature	Athlon II X2 255	Phenom X3 8450
Cores / Threads	2 / 2	3 / 3+50%
Boost Clock	3.1 GHz+48%	2.1 GHz
Base Clock	3.1 GHz	—
L3 Cache	0 kB	2 MB (total)
L2 Cache	1 MB+100%	512 kB (per core)
Process	45 nm-31%	65 nm
Architecture	Regor (2009−2013)	Toliman (2008)
PassMark	1,210	1,221
Geekbench 6 Single	265	—
Geekbench 6 Multi	500	—

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Memory & Platform

The Athlon II X2 255 uses the AM3 socket (PCIe 2.0), while the Phenom X3 8450 uses AM2+ (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Athlon II X2 255	Phenom X3 8450
Socket	AM3	AM2+
PCIe Generation	PCIe 2.0	PCIe 2.0
Max RAM Speed	DDR3-1333	—
Max RAM Capacity	16 GB	—
RAM Channels	2	—
ECC Support	Yes	—
PCIe Lanes	0	—

🔧

Advanced Features

Virtualization: AMD-V (Athlon II X2 255) / not specified (Phenom X3 8450). Primary use case: Athlon II X2 255 targets Legacy Desktop. Direct competitor: Athlon II X2 255 rivals Pentium E5700.

Feature	Athlon II X2 255	Phenom X3 8450
Integrated GPU	No	—
Unlocked	No	—
AVX-512	No	—
Virtualization	AMD-V	—
Target Use	Legacy Desktop	—

💰

Value Analysis

At launch, the Athlon II X2 255 was priced at $60, while the Phenom X3 8450 came in at $145. On launch pricing ($60 vs $145), Athlon II X2 255 was $85 cheaper. In terms of value on MSRP (PassMark points per dollar), the Athlon II X2 255 delivers 20.2 pts/$ vs 8.4 pts/$ for the Phenom X3 8450 — making the Athlon II X2 255 the 82.2% better value option.

Feature	Athlon II X2 255	Phenom X3 8450
MSRP	$60-59%	$145
Performance per Dollar	20.2+140%	8.4
Release Date	2010	2008

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