A6-6400B vs Athlon II X3 425

A6-6400B vs Athlon II X3 425 Performance Spectrum

A6-6400B

2 / 2

1,573

0.0%

Ryzen Threadripper PRO 5945WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Athlon II X3 425

3 / 3

1,595

+1.4%

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.

A6-6400B vs Athlon II X3 425 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.

A6-6400B vs Athlon II X3 425: Pros, Cons & Final Verdict

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

A6-6400B

2013

Why buy it

✅Draws 65W instead of 95W, a 30W reduction.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Radeon HD 8470D, while Athlon II X3 425 needs a discrete GPU.
✅Includes a boxed cooler (true), unlike Athlon II X3 425.

Trade-offs

❌Lower PassMark (1,573 vs 1,595).

Athlon II X3 425

2009

Why buy it

✅+1.4% higher PassMark.

Trade-offs

❌Launch MSRP is still $79 MSRP, while A6-6400B mostly shows up through inconsistent older-market listings.
❌46.2% higher power demand at 95W vs 65W.
❌No integrated graphics, while A6-6400B can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike A6-6400B.

Quick Answers

So, is A6-6400B better than Athlon II X3 425?

It depends on what you want from the system. For gaming, A6-6400B is ahead with a 1.6% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Athlon II X3 425 pulls ahead with 1.4% better PassMark.

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

For streaming, content creation, and heavier multitasking, Athlon II X3 425 is the stronger fit. You are getting 1.4% better PassMark, backed by 3 cores and 3 threads.

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

A6-6400B is still the much better call for a fresh build. A6-6400B comes in at an unclear MSRP at unclear MSRP versus $79 MSRP, and it still gives you a 1.6% average FPS lead across 50 shared CPU game tests in our data. Athlon II X3 425 only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2009 platform. Even with 100.0% better value on paper (20.2 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on AM3.

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

A6-6400B makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2013 vs 2009). That makes it the safer long-term bet.

A6-6400B vs Athlon II X3 425 Technical Specifications

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

A6-6400B

The A6-6400B is manufactured by AMD. It was released in 2014-01-01. It is based on the Richland (2013−2014) architecture. It features 2 cores and 2 threads. Base frequency is 3.9 GHz, with boost up to 4.1 GHz. L2 cache: 1 MB (total). Built on 32 nm process technology. Socket: FM2. Thermal design power (TDP): 65 Watt. Memory support: DDR3-1866. Passmark benchmark score: 1,573 points. Launch price was $70.

Athlon II X3 425

The Athlon II X3 425 is manufactured by AMD. It was released in 20 October 2009 (16 years ago). It is based on the Rana (2009−2011) architecture. It features 3 cores and 3 threads. Base frequency is 2.7 GHz, with boost up to 2.7 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 1,595 points. Launch price was $42.

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Processing Power

The A6-6400B packs 2 cores / 2 threads, while the Athlon II X3 425 offers 3 cores / 3 threads — the Athlon II X3 425 has 1 more core. Boost clocks reach 4.1 GHz on the A6-6400B versus 2.7 GHz on the Athlon II X3 425 — a 41.2% clock advantage for the A6-6400B (base: 3.9 GHz vs 2.7 GHz). The A6-6400B uses the Richland (2013−2014) architecture (32 nm), while the Athlon II X3 425 uses Rana (2009−2011) (45 nm). In PassMark, the A6-6400B scores 1,573 against the Athlon II X3 425's 1,595 — a 1.4% lead for the Athlon II X3 425.

Feature	A6-6400B	Athlon II X3 425
Cores / Threads	2 / 2	3 / 3+50%
Boost Clock	4.1 GHz+52%	2.7 GHz
Base Clock	3.9 GHz+44%	2.7 GHz
L3 Cache	—	0 kB
L2 Cache	1 MB (total)+100%	512 kB (per core)
Process	32 nm-29%	45 nm
Architecture	Richland (2013−2014)	Rana (2009−2011)
PassMark	1,573	1,595+1%

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Memory & Platform

The A6-6400B uses the FM2 socket (PCIe 3.0), while the Athlon II X3 425 uses AM3 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 1866 on the A6-6400B versus DDR3-1333 on the Athlon II X3 425 — the A6-6400B supports 40% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 32 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (A6-6400B) vs 0 (Athlon II X3 425) — the A6-6400B offers 16 more lanes for additional GPUs or NVMe drives. Chipset compatibility: FM2 (A6-6400B) and AMD AM3 (Athlon II X3 425).

Feature	A6-6400B	Athlon II X3 425
Socket	FM2	AM3
PCIe Generation	PCIe 3.0+50%	PCIe 2.0
Max RAM Speed	1866+40%	DDR3-1333
Max RAM Capacity	32 GB	32 GB
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	16	0

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Advanced Features

Virtualization: true (A6-6400B) / not specified (Athlon II X3 425). The A6-6400B includes integrated graphics (Radeon HD 8470D), while the Athlon II X3 425 requires a dedicated GPU. Direct competitor: A6-6400B rivals Pentium G3220.