Celeron 3865U vs Xeon L5240

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 3865U vs Xeon L5240 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 3865U vs Xeon L5240: Pros, Cons & Final Verdict

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

Celeron 3865U

2017

Why buy it

✅Draws 15W instead of 40W, a 25W reduction.
✅100+% more PCIe lanes (10 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel HD Graphics 610, while Xeon L5240 needs a discrete GPU.

Trade-offs

❌Smaller total L3 cache (2 MB vs 6 MB).

Xeon L5240

2008

Why buy it

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

Trade-offs

❌Lower PassMark (1,337 vs 1,343).
❌166.7% higher power demand at 40W vs 15W.
❌No integrated graphics, while Celeron 3865U can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Celeron 3865U better than Xeon L5240?

Not really, because they are built for different jobs. Xeon L5240 makes more sense for workstation-style multi-core throughput, while Celeron 3865U is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Celeron 3865U is the better pick. According to our tests, it delivers 0.2% 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 3865U is the stronger fit. You are getting 0.4% better PassMark, backed by 2 cores and 2 threads.

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

Celeron 3865U still makes the most sense overall. Celeron 3865U comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 0.2% average FPS lead across 50 shared CPU game tests in our data.

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

Celeron 3865U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2017 vs 2008). That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Celeron 3865U vs Xeon L5240 Technical Specifications

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

Celeron 3865U

The Celeron 3865U 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 1.8 GHz, with boost up to 1.8 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: 1,343 points. Launch price was $107.

Xeon L5240

The Xeon L5240 is manufactured by Intel. It was released in 2015-01-01. Base frequency: 3 GHz. L3 cache: 6 MB L2 Cache. Built on 45 nm process technology. Socket: LGA771. Thermal design power (TDP): 40 Watt. Passmark benchmark score: 1,337 points. Launch price was $800.

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Processing Power

The Celeron 3865U is built on the Kaby Lake-U (2017) architecture. In PassMark, the Celeron 3865U scores 1,343 against the Xeon L5240's 1,337 — a 0.4% lead for the Celeron 3865U. L3 cache: 2 MB (total) on the Celeron 3865U vs 6 MB L2 Cache on the Xeon L5240.

Feature	Celeron 3865U	Xeon L5240
Cores / Threads	2 / 2	—
Boost Clock	1.8 GHz	—
Base Clock	1.8 GHz	3 GHz+67%
L3 Cache	2 MB (total)	6 MB L2 Cache+200%
L2 Cache	256K (per core)	—
Process	14 nm-69%	45 nm
Architecture	Kaby Lake-U (2017)	—
PassMark	1,343	1,337
Geekbench 6 Single	389	—
Geekbench 6 Multi	674	—

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Memory & Platform

The Celeron 3865U uses the BGA1356 socket (PCIe 3.0), while the Xeon L5240 uses LGA771 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Celeron 3865U	Xeon L5240
Socket	BGA1356	LGA771
PCIe Generation	PCIe 3.0+50%	PCIe 2.0
Max RAM Speed	DDR4-2133 / LPDDR3-1866	—
Max RAM Capacity	32 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	10	—

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Advanced Features

Virtualization: VT-x / VT-d / EPT (Celeron 3865U) / not specified (Xeon L5240). The Celeron 3865U includes integrated graphics (Intel HD Graphics 610), while the Xeon L5240 requires a dedicated GPU. Primary use case: Celeron 3865U targets Entry-level. Direct competitor: Celeron 3865U rivals Pentium Gold 4415U.