A6-6420K vs Celeron 4305U

A6-6420K vs Celeron 4305U Performance Spectrum

A6-6420K

2 / 2

1,571

+0.6%

Ryzen Threadripper PRO 5945WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Celeron 4305U

2 / 2

1,562

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.

A6-6420K vs Celeron 4305U 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.

A6-6420K vs Celeron 4305U: Pros, Cons & Final Verdict

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

A6-6420K

2014

Why buy it

✅Better for gaming: +3.5% higher average FPS across 50 shared CPU benchmark tests.
✅Includes a boxed cooler (true), unlike Celeron 4305U.

Trade-offs

❌333.3% higher power demand at 65W vs 15W.

Celeron 4305U

2019

Why buy it

✅Draws 15W instead of 65W, a 50W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than A6-6420K across 50 shared CPU benchmark tests.
❌Lower PassMark (1,562 vs 1,571).
❌Launch MSRP is still $107 MSRP, while A6-6420K mostly shows up through inconsistent older-market listings.
❌No boxed cooler included, unlike A6-6420K.

Quick Answers

So, is A6-6420K better than Celeron 4305U?

Yes. A6-6420K is the better all-around CPU here. It gives you a 3.5% average FPS lead across 50 shared CPU game tests in our data and 0.6% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, A6-6420K is the better pick. According to our tests, it delivers 3.5% 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, A6-6420K is the stronger fit. You are getting 0.6% better PassMark, backed by 2 cores and 2 threads.

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

A6-6420K is the easy recommendation for a fresh desktop build. A6-6420K comes in at an unclear MSRP at unclear MSRP versus $107 MSRP, and it still gives you a 3.5% average FPS lead across 50 shared CPU game tests in our data. Celeron 4305U only looks good on raw value math because it is a cheap legacy laptop chip, not because it is a real desktop gaming recommendation. It simply does not keep up in modern games, especially when the gap is already 3.5% in the shared gaming data.

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

Celeron 4305U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2019 vs 2014). That makes it the safer long-term bet.

A6-6420K vs Celeron 4305U Technical Specifications

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

A6-6420K

The A6-6420K 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 4 GHz, with boost up to 4.2 GHz. L2 cache: 1024 kB. Built on 32 nm process technology. Socket: FM2. Thermal design power (TDP): 65 Watt. Memory support: DDR3-1866. Passmark benchmark score: 1,571 points. Launch price was $70.

Celeron 4305U

The Celeron 4305U is manufactured by Intel. It was released in 16 April 2019 (6 years ago). It is based on the Whiskey Lake-U (2018−2019) architecture. It features 2 cores and 2 threads. Base frequency is 2.2 GHz, with boost up to 2.2 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: DDR4-2133, LPDDR3-1866. Passmark benchmark score: 1,562 points. Launch price was $107.

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Processing Power

Both the A6-6420K and Celeron 4305U share an identical 2-core/2-thread configuration. Boost clocks reach 4.2 GHz on the A6-6420K versus 2.2 GHz on the Celeron 4305U — a 62.5% clock advantage for the A6-6420K (base: 4 GHz vs 2.2 GHz). The A6-6420K uses the Richland (2013−2014) architecture (32 nm), while the Celeron 4305U uses Whiskey Lake-U (2018−2019) (14 nm). In PassMark, the A6-6420K scores 1,571 against the Celeron 4305U's 1,562 — a 0.6% lead for the A6-6420K.

Feature	A6-6420K	Celeron 4305U
Cores / Threads	2 / 2	2 / 2
Boost Clock	4.2 GHz+91%	2.2 GHz
Base Clock	4 GHz+82%	2.2 GHz
L3 Cache	—	2 MB (total)
L2 Cache	1024 kB+300%	256 kB (per core)
Process	32 nm	14 nm-56%
Architecture	Richland (2013−2014)	Whiskey Lake-U (2018−2019)
PassMark	1,571	1,562

🧠

Memory & Platform

The A6-6420K uses the FM2 socket (PCIe 3.0), while the Celeron 4305U uses FCBGA1528 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 1866 on the A6-6420K versus 2133 on the Celeron 4305U — the Celeron 4305U supports 14.3% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Celeron 4305U supports up to 64 of RAM compared to 32 — 100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes. Chipset compatibility: FM2 (A6-6420K) and Whiskey Lake-U (Celeron 4305U).

Feature	A6-6420K	Celeron 4305U
Socket	FM2	FCBGA1528
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	1866	2133+14%
Max RAM Capacity	32	64+100%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	16	16

🔧

Advanced Features

Only the A6-6420K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support true virtualization. Both include integrated graphics — Radeon HD 8470D (A6-6420K) and Intel UHD Graphics 610 (Celeron 4305U) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Celeron 4305U targets Budget. Direct competitor: A6-6420K rivals Pentium G3258; Celeron 4305U rivals Pentium Gold 5405U.