Athlon II X4 635 vs Core i5-3427U

Athlon II X4 635 vs Core i5-3427U Performance Spectrum

Athlon II X4 635

4 / 4

2,248

0.0%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Core i5-3427U

2 / 4

2,252

+0.2%

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 635 vs Core i5-3427U 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 635 vs Core i5-3427U: 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 635

2010

Why buy it

✅Draws 95W instead of 512W, a 417W reduction.
✅Includes a boxed cooler (Yes), unlike Core i5-3427U.

Trade-offs

❌Lower PassMark (2,248 vs 2,252).
❌Launch MSRP is still $400 MSRP, while Core i5-3427U mostly shows up through inconsistent older-market listings.
❌No integrated graphics, while Core i5-3427U can still boot and troubleshoot without a discrete GPU.

Core i5-3427U

2012

Why buy it

✅+0.2% higher PassMark.
✅Integrated graphics onboard with Intel HD Graphics 4000, while Athlon II X4 635 needs a discrete GPU.

Trade-offs

❌438.9% higher power demand at 512W vs 95W.
❌No boxed cooler included, unlike Athlon II X4 635.

Quick Answers

So, is Athlon II X4 635 better than Core i5-3427U?

It depends on what you want from the system. For gaming, Athlon II X4 635 is ahead with a 0.3% average FPS lead across 43 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i5-3427U pulls ahead with 0.2% better PassMark.

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

For streaming, content creation, and heavier multitasking, Core i5-3427U is the stronger fit. You are getting 0.2% better PassMark, backed by 2 cores and 4 threads.

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

Athlon II X4 635 is the better buy right now. Athlon II X4 635 comes in at an unclear MSRP at $400 MSRP versus unclear MSRP, and it still gives you a 0.3% average FPS lead across 43 shared CPU game tests in our data. The compromise is that Core i5-3427U is still stronger for heavier multi-core work with 0.2% better PassMark. It is also 100.0% better value on MSRP (5.6 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Core i5-3427U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2012 vs 2010) and more multi-core headroom with 2 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 635 vs Core i5-3427U Technical Specifications

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

Athlon II X4 635

The Athlon II X4 635 is manufactured by AMD. It was released in 25 January 2010 (15 years ago). It is based on the Propus (2009−2011) architecture. It features 4 cores and 4 threads. Base frequency is 2.9 GHz, with boost up to 2.9 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: 2,248 points. Launch price was $70.

Core i5-3427U

The Core i5-3427U is manufactured by Intel. It was released in 1 June 2012 (13 years ago). It is based on the Ivy Bridge (2012−2013) architecture. It features 2 cores and 4 threads. Base frequency is 1.8 GHz, with boost up to 2.8 GHz. L3 cache: 3 MB (total). L2 cache: 256K (per core). Built on 22 nm process technology. Socket: BGA1023. Thermal design power (TDP): 17 Watt. Memory support: DDR3/L/-RS 1333/1600. Passmark benchmark score: 2,252 points. Launch price was $225.

⚡

Processing Power

The Athlon II X4 635 packs 4 cores / 4 threads, while the Core i5-3427U offers 2 cores / 4 threads — the Athlon II X4 635 has 2 more cores. Boost clocks reach 2.9 GHz on the Athlon II X4 635 versus 2.8 GHz on the Core i5-3427U — a 3.5% clock advantage for the Athlon II X4 635 (base: 2.9 GHz vs 1.8 GHz). The Athlon II X4 635 uses the Propus (2009−2011) architecture (45 nm), while the Core i5-3427U uses Ivy Bridge (2012−2013) (22 nm). In PassMark, the Athlon II X4 635 scores 2,248 against the Core i5-3427U's 2,252 — a 0.2% lead for the Core i5-3427U. L3 cache: 0 kB on the Athlon II X4 635 vs 3 MB (total) on the Core i5-3427U.

Feature	Athlon II X4 635	Core i5-3427U
Cores / Threads	4 / 4+100%	2 / 4
Boost Clock	2.9 GHz+4%	2.8 GHz
Base Clock	2.9 GHz+61%	1.8 GHz
L3 Cache	0 kB	3 MB (total)
L2 Cache	512 kB (per core)+100%	256K (per core)
Process	45 nm	22 nm-51%
Architecture	Propus (2009−2011)	Ivy Bridge (2012−2013)
PassMark	2,248	2,252
Cinebench R23 Multi	658	—
Geekbench 6 Single	180	—
Geekbench 6 Multi	550	—

🧠

Memory & Platform

The Athlon II X4 635 uses the AM3 socket (PCIe 2.0), while the Core i5-3427U uses BGA1023 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 / DDR2-1066 on the Athlon II X4 635 versus 1600 on the Core i5-3427U — the Core i5-3427U supports 20% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-3427U supports up to 32 GB of RAM compared to 16 GB — 100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes. Chipset compatibility: AMD 770,785G,790FX,880G,890FX,970,990FX (Athlon II X4 635) and HM76,UM77,QM77,QS77 (Core i5-3427U).

Feature	Athlon II X4 635	Core i5-3427U
Socket	AM3	BGA1023
PCIe Generation	PCIe 2.0	PCIe 3.0+50%
Max RAM Speed	DDR3-1333 / DDR2-1066	1600+20%
Max RAM Capacity	16 GB	32 GB+100%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	16	16

🔧

Advanced Features

Only the Athlon II X4 635 has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: AMD-V (Athlon II X4 635) vs true (Core i5-3427U). The Core i5-3427U includes integrated graphics (Intel HD Graphics 4000), while the Athlon II X4 635 requires a dedicated GPU. Primary use case: Athlon II X4 635 targets Budget. Direct competitor: Core i5-3427U rivals AMD A8-4555M.