Celeron 3965U vs Core i5-520M

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.

Celeron 3965U vs Core i5-520M 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.

Celeron 3965U vs Core i5-520M: Pros, Cons & Final Verdict

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

Celeron 3965U

2017

Why buy it

✅Better for gaming: +3.1% higher average FPS across 50 shared CPU benchmark tests.
✅Draws 15W instead of 35W, a 20W reduction.

Trade-offs

❌Smaller total L3 cache (2 MB vs 3 MB).

Core i5-520M

2010

Why buy it

✅+50% larger total L3 cache (3 MB vs 2 MB).
✅60% more PCIe lanes (16 vs 10) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Celeron 3965U across 50 shared CPU benchmark tests.
❌Lower Geekbench multi-core (695 vs 1,200).
❌Launch MSRP is still $225 MSRP, while Celeron 3965U mostly shows up through inconsistent older-market listings.
❌133.3% higher power demand at 35W vs 15W.

Quick Answers

So, is Celeron 3965U better than Core i5-520M?

Yes. Celeron 3965U is the better all-around CPU here. It gives you a 3.1% average FPS lead across 50 shared CPU game tests in our data, 72.7% better Geekbench multi-core, 1.5% higher 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, Celeron 3965U is the better pick. According to our tests, it delivers 3.1% 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, Celeron 3965U is the stronger fit. You are getting 72.7% better Geekbench multi-core, backed by 2 cores and 2 threads.

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

Celeron 3965U is still the much better call for a fresh build. Celeron 3965U comes in at an unclear MSRP at unclear MSRP versus $225 MSRP, and it still gives you a 3.1% average FPS lead across 50 shared CPU game tests in our data. Core i5-520M only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2010 platform. Even with 100.0% better value on paper (7.7 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on PGA988.

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

Celeron 3965U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2017 vs 2010) and more multi-core headroom with 2 cores / 2 threads instead of 2/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Celeron 3965U vs Core i5-520M Technical Specifications

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

Celeron 3965U

The Celeron 3965U is manufactured by Intel. It was released in 3 January 2017 (8 years ago). It is based on the Kaby Lake-U (2017) 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: 256K (per core). Built on 14 nm process technology. Socket: BGA1356. Thermal design power (TDP): 15 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 1,753 points. Launch price was $107.

Core i5-520M

The Core i5-520M is manufactured by Intel. It was released in 7 January 2010 (15 years ago). It is based on the Arrandale (2010−2011) architecture. It features 2 cores and 4 threads. Base frequency is 2.4 GHz, with boost up to 2.93 GHz. L3 cache: 3 MB. L2 cache: 512 kB. Built on 32 nm process technology. Socket: PGA988. Thermal design power (TDP): 35 Watt. Memory support: DDR3-800, DDR3-1066. Passmark benchmark score: 1,727 points. Launch price was $225.

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Processing Power

The Celeron 3965U packs 2 cores / 2 threads, matching the Core i5-520M's 2 cores. Boost clocks reach 2.2 GHz on the Celeron 3965U versus 2.93 GHz on the Core i5-520M — a 28.5% clock advantage for the Core i5-520M (base: 2.2 GHz vs 2.4 GHz). The Celeron 3965U uses the Kaby Lake-U (2017) architecture (14 nm), while the Core i5-520M uses Arrandale (2010−2011) (32 nm). In PassMark, the Celeron 3965U scores 1,753 against the Core i5-520M's 1,727 — a 1.5% lead for the Celeron 3965U. Geekbench 6 single-core — the metric most relevant to gaming — records 600 vs 360, a 50% lead for the Celeron 3965U that directly translates to higher frame rates. Multi-core Geekbench: 1,200 vs 695 (53.3% advantage for the Celeron 3965U). L3 cache: 2 MB (total) on the Celeron 3965U vs 3 MB on the Core i5-520M.

Feature	Celeron 3965U	Core i5-520M
Cores / Threads	2 / 2	2 / 4
Boost Clock	2.2 GHz	2.93 GHz+33%
Base Clock	2.2 GHz	2.4 GHz+9%
L3 Cache	2 MB (total)	3 MB+50%
L2 Cache	256K (per core)	512 kB+100%
Process	14 nm-56%	32 nm
Architecture	Kaby Lake-U (2017)	Arrandale (2010−2011)
PassMark	1,753+2%	1,727
Geekbench 6 Single	600+67%	360
Geekbench 6 Multi	1,200+73%	695

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Memory & Platform

The Celeron 3965U uses the BGA1356 socket (PCIe 3.0), while the Core i5-520M uses PGA988 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2133 on the Celeron 3965U versus 1066 on the Core i5-520M — the Celeron 3965U supports 100.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Celeron 3965U supports up to 32 GB of RAM compared to 8 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 10 (Celeron 3965U) vs 16 (Core i5-520M) — the Core i5-520M offers 6 more lanes for additional GPUs or NVMe drives. Chipset compatibility: SoC (Celeron 3965U) and HM55,HM57,QM57 (Core i5-520M).

Feature	Celeron 3965U	Core i5-520M
Socket	BGA1356	PGA988
PCIe Generation	PCIe 3.0+50%	PCIe 2.0
Max RAM Speed	DDR4-2133+100%	1066
Max RAM Capacity	32 GB+300%	8 GB
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	10	16+60%

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Advanced Features

Neither processor supports overclocking. Virtualization support: VT-x (Celeron 3965U) vs true (Core i5-520M). Both include integrated graphics — Intel HD Graphics 610 (Celeron 3965U) and Intel HD Graphics (Ironlake) (Core i5-520M) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Celeron 3965U targets Budget Laptop. Direct competitor: Celeron 3965U rivals Pentium Gold 4415U; Core i5-520M rivals AMD Turion II Ultra M660.

Feature	Celeron 3965U	Core i5-520M
Integrated GPU	Yes	Yes
IGPU Model	Intel HD Graphics 610	Intel HD Graphics (Ironlake)
Unlocked	No	No
AVX-512	No	No
Virtualization	VT-x	true
Target Use	Budget Laptop	—