Athlon II M300 vs Athlon X2 QL-66

Athlon II M300 vs Athlon X2 QL-66 Performance Spectrum

Athlon II M300

2 / 2

1,700

+0.3%

Ryzen Threadripper PRO 5945WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Athlon X2 QL-66

2 / 2

1,695

0.0%

Ryzen Threadripper PRO 5945WX

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 M300 vs Athlon X2 QL-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.

Athlon II M300 vs Athlon X2 QL-66: 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 M300

2009

Why buy it

✅+0.3% higher PassMark.
✅Costs $50 less on MSRP ($100 MSRP vs $150 MSRP).
✅Delivers 50.4% more PassMark for each dollar spent, at 17.0 vs 11.3 PassMark/$ ($100 MSRP vs $150 MSRP).

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Athlon X2 QL-66

2009

Why buy it

Trade-offs

❌Lower PassMark (1,695 vs 1,700).
❌Lower PassMark per dollar, at 11.3 vs 17.0 PassMark/$ ($150 MSRP vs $100 MSRP).

Quick Answers

So, is Athlon II M300 better than Athlon X2 QL-66?

It depends on what you want from the system. For gaming, Athlon X2 QL-66 is ahead with a 0.2% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Athlon II M300 pulls ahead with 0.3% better PassMark.

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

For streaming, content creation, and heavier multitasking, Athlon II M300 is the stronger fit. You are getting 0.3% better PassMark, backed by 2 cores and 2 threads.

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

Athlon II M300 is the better buy right now. Athlon II M300 comes in $50 cheaper on MSRP at $100 MSRP versus $150 MSRP, and it still gives you 0.3% better PassMark. The compromise is that Athlon X2 QL-66 is still the better pure gaming CPU with a 0.2% average FPS lead across 50 shared CPU game tests in our data. It is also 50.4% better value on MSRP (17.0 vs 11.3 PassMark/$), 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 M300 makes more sense long term for 2026 and beyond. You are getting more multi-core headroom with 2 cores / 2 threads instead of 2/2. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Athlon II M300 vs Athlon X2 QL-66 Technical Specifications

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

Athlon II M300

The Athlon II M300 is manufactured by AMD. It was released in 2009-01-01. It is based on the Caspian (2009) architecture. It features 2 cores and 2 threads. Max frequency: 2 GHz. L2 cache: 1 MB. Built on 45 nm process technology. Socket: S1g3. Thermal design power (TDP): 1 MB. Memory support: DDR2. Passmark benchmark score: 1,700 points. Launch price was $149.

Athlon X2 QL-66

The Athlon X2 QL-66 is manufactured by AMD. It was released in 2009-01-01. It is based on the Lion (2008−2009) architecture. It features 2 cores and 2 threads. Max frequency: 2.2 GHz. L2 cache: 1 MB. Built on 65 nm process technology. Socket: S1g2. Thermal design power (TDP): 1 MB. Passmark benchmark score: 1,695 points. Launch price was $149.

⚡

Processing Power

Both the Athlon II M300 and Athlon X2 QL-66 share an identical 2-core/2-thread configuration. Boost clocks reach 2 GHz on the Athlon II M300 versus 2.2 GHz on the Athlon X2 QL-66 — a 9.5% clock advantage for the Athlon X2 QL-66. The Athlon II M300 uses the Caspian (2009) architecture (45 nm), while the Athlon X2 QL-66 uses Lion (2008−2009) (65 nm). In PassMark, the Athlon II M300 scores 1,700 against the Athlon X2 QL-66's 1,695 — a 0.3% lead for the Athlon II M300.

Feature	Athlon II M300	Athlon X2 QL-66
Cores / Threads	2 / 2	2 / 2
Boost Clock	2 GHz	2.2 GHz+10%
L2 Cache	1 MB	1 MB
Process	45 nm-31%	65 nm
Architecture	Caspian (2009)	Lion (2008−2009)
PassMark	1,700	1,695

🧠

Memory & Platform

The Athlon II M300 uses the S1g3 socket (PCIe 2.0), while the Athlon X2 QL-66 uses S1g2 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 800 on the Athlon II M300 versus DDR2-667 on the Athlon X2 QL-66 — the Athlon II M300 supports 19.9% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 8 GB of RAM. Both feature 2-channel memory with ECC support. Both provide 0 PCIe lanes. Chipset compatibility: S1g3 (Athlon II M300) and AMD S1 (Athlon X2 QL-66).

Feature	Athlon II M300	Athlon X2 QL-66
Socket	S1g3	S1g2
PCIe Generation	PCIe 2.0	PCIe 2.0
Max RAM Speed	800+20%	DDR2-667
Max RAM Capacity	8 GB	8 GB
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	0	0

🔧

Advanced Features

Virtualization: true (Athlon II M300) / not specified (Athlon X2 QL-66). Direct competitor: Athlon II M300 rivals Core 2 Duo T6400.

Feature	Athlon II M300	Athlon X2 QL-66
Integrated GPU	No	No
IGPU Model	None	—
Unlocked	No	—
AVX-512	No	—
Virtualization	true	—

💰

Value Analysis

At launch, the Athlon II M300 was priced at $100, while the Athlon X2 QL-66 came in at $150. On launch pricing ($100 vs $150), Athlon II M300 was $50 cheaper. In terms of value on MSRP (PassMark points per dollar), the Athlon II M300 delivers 17.0 pts/$ vs 11.3 pts/$ for the Athlon X2 QL-66 — making the Athlon II M300 the 40.3% better value option.

Feature	Athlon II M300	Athlon X2 QL-66
MSRP	$100-33%	$150
Performance per Dollar	17.0+50%	11.3
Release Date	2009	2009

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