Pentium Gold 5405U vs Phenom II X4 840T

Pentium Gold 5405U vs Phenom II X4 840T Performance Spectrum

Pentium Gold 5405U

2 / 4

2,357

0.0%

2,367

+0.4%

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.

Pentium Gold 5405U 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.

Pentium Gold 5405U 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.

Pentium Gold 5405U

2019

Why buy it

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

Trade-offs

❌Lower PassMark (2,357 vs 2,367).
❌Smaller total L3 cache (2 MB vs 6 MB).

Phenom II X4 840T

2010

Why buy it

✅+200% larger total L3 cache (6 MB vs 2 MB).

Trade-offs

❌533.3% higher power demand at 95W vs 15W.

Quick Answers

So, is Phenom II X4 840T better than Pentium Gold 5405U?

Yes. Phenom II X4 840T is the better all-around CPU here. It gives you a 0.3% average FPS lead across 50 shared CPU game tests in our data and 0.4% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Phenom II X4 840T is the better pick. According to our tests, it delivers 0.3% 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, Phenom II X4 840T is the stronger fit. You are getting 0.4% better PassMark, backed by 4 cores and 4 threads. It also has the larger cache pool with 200% larger total L3 cache (6 MB vs 2 MB).

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

Phenom II X4 840T still makes the most sense overall. Phenom II X4 840T comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 0.3% average FPS lead across 50 shared CPU game tests in our data.

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.

Pentium Gold 5405U vs Phenom II X4 840T Technical Specifications

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

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.

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

The Pentium Gold 5405U packs 2 cores / 4 threads, while the Phenom II X4 840T offers 4 cores / 4 threads — the Phenom II X4 840T has 2 more cores. Boost clocks reach 2.3 GHz on the Pentium Gold 5405U versus 3.2 GHz on the Phenom II X4 840T — a 32.7% clock advantage for the Phenom II X4 840T (base: 2.3 GHz vs 2.9 GHz). The Pentium Gold 5405U uses the Whiskey Lake-U (2018−2019) architecture (14 nm), while the Phenom II X4 840T uses Zosma (2010−2011) (45 nm). In PassMark, the Pentium Gold 5405U scores 2,357 against the Phenom II X4 840T's 2,367 — a 0.4% lead for the Phenom II X4 840T. L3 cache: 2 MB (total) on the Pentium Gold 5405U vs 6 MB (total) on the Phenom II X4 840T.

Feature	Pentium Gold 5405U	Phenom II X4 840T
Cores / Threads	2 / 4	4 / 4+100%
Boost Clock	2.3 GHz	3.2 GHz+39%
Base Clock	2.3 GHz	2.9 GHz+26%
L3 Cache	2 MB (total)	6 MB (total)+200%
L2 Cache	256 kB (per core)	512 kB (per core)+100%
Process	14 nm-69%	45 nm
Architecture	Whiskey Lake-U (2018−2019)	Zosma (2010−2011)
PassMark	2,357	2,367

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Memory & Platform

The Pentium Gold 5405U uses the FCBGA1528 socket (PCIe 3.0), while the Phenom II X4 840T uses AM3 (PCIe 2.0) — making them incompatible on the same motherboard.