Core i5-3550S vs Xeon L5639

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.

Core i5-3550S vs Xeon L5639 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.

Core i5-3550S vs Xeon L5639: Pros, Cons & Final Verdict

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

Core i5-3550S

2012

Why buy it

✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with HD Graphics 2500, while Xeon L5639 needs a discrete GPU.
✅Includes a boxed cooler (Yes), unlike Xeon L5639.

Trade-offs

❌Smaller total L3 cache (6 MB vs 12 MB).
❌Less compelling for workstation-style loads than Xeon L5639, which brings 6 cores / 12 threads.
❌Launch MSRP is still $205 MSRP, while Xeon L5639 mostly shows up through inconsistent older-market listings.

Xeon L5639

2011

Why buy it

✅+100% larger total L3 cache (12 MB vs 6 MB).
✅Better for workstations and heavier parallel workloads: 6 cores / 12 threads.
✅Draws 60W instead of 65W, a 5W reduction.

Trade-offs

❌Lower PassMark (4,419 vs 4,442).
❌No integrated graphics, while Core i5-3550S can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike Core i5-3550S.

Quick Answers

So, is Core i5-3550S better than Xeon L5639?

Not really, because they are built for different jobs. Xeon L5639 makes more sense for workstation-style multi-core throughput, while Core i5-3550S is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Core i5-3550S is the better pick. According to our tests, it delivers 1.1% more average FPS across 42 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Core i5-3550S is the stronger fit. You are getting 0.5% better PassMark, backed by 4 cores and 4 threads.

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

Core i5-3550S is the better buy right now. Core i5-3550S comes in at an unclear MSRP at $205 MSRP versus unclear MSRP, and it still gives you a 1.1% average FPS lead across 42 shared CPU game tests in our data. It is also 100.0% better value on MSRP (21.7 vs 0.0 PassMark/$), 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 i5-3550S makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2012 vs 2011) and more multi-core headroom with 4 cores / 4 threads instead of 6/12. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core i5-3550S vs Xeon L5639 Technical Specifications

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

Core i5-3550S

The Core i5-3550S is manufactured by Intel. It was released in 29 April 2012 (13 years ago). It is based on the Ivy Bridge (2012−2013) architecture. It features 4 cores and 4 threads. Base frequency is 3 GHz, with boost up to 3.7 GHz. L3 cache: 6144 kB (total). L2 cache: 256 kB (per core). Built on 22 nm process technology. Socket: LGA1155. Thermal design power (TDP): 65 Watt. Memory support: DDR3. Passmark benchmark score: 4,442 points. Launch price was $350.

Xeon L5639

The Xeon L5639 is manufactured by Intel. It was released in 2015-01-01. It is based on the Westmere-EP (2010−2011) architecture. It features 6 cores and 12 threads. Base frequency is 2.133 GHz, with boost up to 2.67 GHz. L3 cache: 12 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1366. Thermal design power (TDP): 60 Watt. Memory support: DDR3. Passmark benchmark score: 4,419 points. Launch price was $800.

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Processing Power

The Core i5-3550S packs 4 cores / 4 threads, while the Xeon L5639 offers 6 cores / 12 threads — the Xeon L5639 has 2 more cores. Boost clocks reach 3.7 GHz on the Core i5-3550S versus 2.67 GHz on the Xeon L5639 — a 32.3% clock advantage for the Core i5-3550S (base: 3 GHz vs 2.133 GHz). The Core i5-3550S uses the Ivy Bridge (2012−2013) architecture (22 nm), while the Xeon L5639 uses Westmere-EP (2010−2011) (32 nm). In PassMark, the Core i5-3550S scores 4,442 against the Xeon L5639's 4,419 — a 0.5% lead for the Core i5-3550S. L3 cache: 6144 kB (total) on the Core i5-3550S vs 12 MB (total) on the Xeon L5639.

Feature	Core i5-3550S	Xeon L5639
Cores / Threads	4 / 4	6 / 12+50%
Boost Clock	3.7 GHz+39%	2.67 GHz
Base Clock	3 GHz+41%	2.133 GHz
L3 Cache	6144 kB (total)	12 MB (total)+100%
L2 Cache	256 kB (per core)	256 kB (per core)
Process	22 nm-31%	32 nm
Architecture	Ivy Bridge (2012−2013)	Westmere-EP (2010−2011)
PassMark	4,442	4,419
Geekbench 6 Single	619	—

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Memory & Platform

The Core i5-3550S uses the LGA1155 socket (PCIe 3.0), while the Xeon L5639 uses LGA1366 (PCIe 4.0) — making them incompatible on the same motherboard.

Feature	Core i5-3550S	Xeon L5639
Socket	LGA1155	LGA1366
PCIe Generation	PCIe 3.0	PCIe 4.0+33%
Max RAM Speed	DDR3-1600	—
Max RAM Capacity	32 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	16	—

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Advanced Features

Virtualization: VT-x, VT-d, EPT (Core i5-3550S) / not specified (Xeon L5639). The Core i5-3550S includes integrated graphics (HD Graphics 2500), while the Xeon L5639 requires a dedicated GPU. Primary use case: Core i5-3550S targets Legacy Desktop. Direct competitor: Core i5-3550S rivals FX-6350.