Athlon II X4 645 vs Phenom II X4 840T

Athlon II X4 645 vs Phenom II X4 840T Performance Spectrum

Athlon II X4 645

4 / 4

2,375

+0.3%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Phenom II X4 840T

4 / 4

2,367

0.0%

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 X4 645 vs Phenom II X4 840T 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 X4 645 vs Phenom II X4 840T: 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 X4 645

2010

Why buy it

✅Better for gaming: +4.0% higher average FPS across 50 shared CPU benchmark tests.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Includes a boxed cooler (Yes), unlike Phenom II X4 840T.

Trade-offs

❌Launch MSRP is still $126 MSRP, while Phenom II X4 840T mostly shows up through inconsistent older-market listings.

Phenom II X4 840T

2010

Why buy it

Trade-offs

❌Worse for gaming: lower average FPS than Athlon II X4 645 across 50 shared CPU benchmark tests.
❌Lower PassMark (2,367 vs 2,375).
❌No boxed cooler included, unlike Athlon II X4 645.

Quick Answers

So, is Athlon II X4 645 better than Phenom II X4 840T?

Yes. Athlon II X4 645 is the better all-around CPU here. It gives you a 4.0% average FPS lead across 50 shared CPU game tests in our data, 0.3% better PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Athlon II X4 645 is the better pick. According to our tests, it delivers 4.0% more average FPS across 50 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Athlon II X4 645 is the stronger fit. You are getting 0.3% better PassMark, backed by 4 cores and 4 threads.

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

Athlon II X4 645 is the better buy right now. Athlon II X4 645 comes in at an unclear MSRP at $126 MSRP versus unclear MSRP, and it still gives you a 4.0% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (18.8 vs 0.0 PassMark/$), 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 X4 645 makes more sense long term for 2026 and beyond. You are getting more multi-core headroom with 4 cores / 4 threads instead of 4/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Athlon II X4 645 vs Phenom II X4 840T Technical Specifications

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

Athlon II X4 645

The Athlon II X4 645 is manufactured by AMD. It was released in 21 September 2010 (15 years ago). It is based on the Propus (2009−2011) architecture. It features 4 cores and 4 threads. Base frequency is 3.1 GHz, with boost up to 3.1 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: 2,375 points. Launch price was $80.

Phenom II X4 840T

The Phenom II X4 840T is manufactured by AMD. It was released in 1 September 2010 (15 years ago). It is based on the Zosma (2010−2011) architecture. It features 4 cores and 4 threads. Base frequency is 2.9 GHz, with boost up to 3.2 GHz. L3 cache: 6 MB (total). 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: 2,367 points. Launch price was $80.

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Processing Power

Both the Athlon II X4 645 and Phenom II X4 840T share an identical 4-core/4-thread configuration. Boost clocks reach 3.1 GHz on the Athlon II X4 645 versus 3.2 GHz on the Phenom II X4 840T — a 3.2% clock advantage for the Phenom II X4 840T (base: 3.1 GHz vs 2.9 GHz). The Athlon II X4 645 uses the Propus (2009−2011) architecture (45 nm), while the Phenom II X4 840T uses Zosma (2010−2011) (45 nm). In PassMark, the Athlon II X4 645 scores 2,375 against the Phenom II X4 840T's 2,367 — a 0.3% lead for the Athlon II X4 645. L3 cache: 0 kB on the Athlon II X4 645 vs 6 MB (total) on the Phenom II X4 840T.

Feature	Athlon II X4 645	Phenom II X4 840T
Cores / Threads	4 / 4	4 / 4
Boost Clock	3.1 GHz	3.2 GHz+3%
Base Clock	3.1 GHz+7%	2.9 GHz
L3 Cache	0 kB	6 MB (total)
L2 Cache	512 kB (per core)	512 kB (per core)
Process	45 nm	45 nm
Architecture	Propus (2009−2011)	Zosma (2010−2011)
PassMark	2,375	2,367
Cinebench R23 Multi	1,374	—
Geekbench 6 Single	399	—
Geekbench 6 Multi	1,374	—