Athlon II X4 645 vs Pentium Gold 5405U

Athlon II X4 645 vs Pentium Gold 5405U Performance Spectrum

Athlon II X4 645

4 / 4

2,375

+0.8%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Pentium Gold 5405U

2 / 4

2,357

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 II X4 645 vs Pentium Gold 5405U 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 Pentium Gold 5405U: 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: +3.7% 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 Pentium Gold 5405U.

Trade-offs

❌Launch MSRP is still $126 MSRP, while Pentium Gold 5405U mostly shows up through inconsistent older-market listings.
❌533.3% higher power demand at 95W vs 15W.

Pentium Gold 5405U

2019

Why buy it

✅Draws 15W instead of 95W, a 80W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Athlon II X4 645 across 50 shared CPU benchmark tests.
❌Lower PassMark (2,357 vs 2,375).
❌No boxed cooler included, unlike Athlon II X4 645.

Quick Answers

So, is Athlon II X4 645 better than Pentium Gold 5405U?

Yes. Athlon II X4 645 is the better all-around CPU here. It gives you a 3.7% average FPS lead across 50 shared CPU game tests in our data and 0.8% better PassMark, 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 3.7% 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 0.8% 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 $126 MSRP versus unclear MSRP, and it still gives you a 3.7% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (18.8 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Pentium Gold 5405U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2019 vs 2010). That makes it the safer long-term bet.

Athlon II X4 645 vs Pentium Gold 5405U 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.

Pentium Gold 5405U

The Pentium Gold 5405U is manufactured by Intel. It was released in 23 January 2019 (6 years ago). It is based on the Whiskey Lake-U (2018−2019) architecture. It features 2 cores and 4 threads. Base frequency is 2.3 GHz, with boost up to 2.3 GHz. L3 cache: 2 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: FCBGA1528. Thermal design power (TDP): 15 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 2,357 points. Launch price was $161.

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Processing Power

The Athlon II X4 645 packs 4 cores / 4 threads, while the Pentium Gold 5405U offers 2 cores / 4 threads — the Athlon II X4 645 has 2 more cores. Boost clocks reach 3.1 GHz on the Athlon II X4 645 versus 2.3 GHz on the Pentium Gold 5405U — a 29.6% clock advantage for the Athlon II X4 645 (base: 3.1 GHz vs 2.3 GHz). The Athlon II X4 645 uses the Propus (2009−2011) architecture (45 nm), while the Pentium Gold 5405U uses Whiskey Lake-U (2018−2019) (14 nm). In PassMark, the Athlon II X4 645 scores 2,375 against the Pentium Gold 5405U's 2,357 — a 0.8% lead for the Athlon II X4 645. L3 cache: 0 kB on the Athlon II X4 645 vs 2 MB (total) on the Pentium Gold 5405U.

Feature	Athlon II X4 645	Pentium Gold 5405U
Cores / Threads	4 / 4+100%	2 / 4
Boost Clock	3.1 GHz+35%	2.3 GHz
Base Clock	3.1 GHz+35%	2.3 GHz
L3 Cache	0 kB	2 MB (total)
L2 Cache	512 kB (per core)+100%	256 kB (per core)
Process	45 nm	14 nm-69%
Architecture	Propus (2009−2011)	Whiskey Lake-U (2018−2019)
PassMark	2,375	2,357
Cinebench R23 Multi	1,374	—
Geekbench 6 Single	399	—
Geekbench 6 Multi	1,374	—

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Memory & Platform

The Athlon II X4 645 uses the AM3 socket (PCIe 2.0), while the Pentium Gold 5405U uses FCBGA1528 (PCIe 3.0) — making them incompatible on the same motherboard.