Xeon L5639 vs Xeon X5647

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.

Xeon L5639 vs Xeon X5647 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.

Xeon L5639 vs Xeon X5647: Pros, Cons & Final Verdict

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

Xeon L5639

2011

Why buy it

✅Draws 60W instead of 130W, a 70W reduction.

Trade-offs

❌Lower PassMark (4,419 vs 4,441).

Xeon X5647

2011

Why buy it

Trade-offs

❌116.7% higher power demand at 130W vs 60W.

Quick Answers

So, is Xeon X5647 better than Xeon L5639?

Yes. Xeon X5647 is the better all-around CPU here. It gives you a 0.7% average FPS lead across 42 shared CPU game tests in our data and 0.5% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Xeon X5647 is the better pick. According to our tests, it delivers 0.7% 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, Xeon X5647 is the stronger fit. You are getting 0.5% better PassMark, backed by 4 cores and 8 threads.

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

Xeon X5647 still makes the most sense overall. Xeon X5647 comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 0.7% average FPS lead across 42 shared CPU game tests in our data.

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

Xeon X5647 is the safer long-term CPU choice because it gives you more room to grow and a better platform outlook.

Xeon L5639 vs Xeon X5647 Technical Specifications

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

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.

Xeon X5647

The Xeon X5647 is manufactured by Intel. It was released in 14 February 2011 (14 years ago). It is based on the Westmere-EP (2010−2011) architecture. It features 4 cores and 8 threads. Base frequency is 2.93 GHz, with boost up to 3.2 GHz. L3 cache: 12 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1366. Thermal design power (TDP): 130 Watt. Memory support: DDR3. Passmark benchmark score: 4,441 points. Launch price was $175.

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Processing Power

The Xeon L5639 packs 6 cores / 12 threads, while the Xeon X5647 offers 4 cores / 8 threads — the Xeon L5639 has 2 more cores. Boost clocks reach 2.67 GHz on the Xeon L5639 versus 3.2 GHz on the Xeon X5647 — a 18.1% clock advantage for the Xeon X5647 (base: 2.133 GHz vs 2.93 GHz). Both are built on the Westmere-EP (2010−2011) architecture using a 32 nm process. In PassMark, the Xeon L5639 scores 4,419 against the Xeon X5647's 4,441 — a 0.5% lead for the Xeon X5647. Both processors carry 12 MB (total) of L3 cache.

Feature	Xeon L5639	Xeon X5647
Cores / Threads	6 / 12+50%	4 / 8
Boost Clock	2.67 GHz	3.2 GHz+20%
Base Clock	2.133 GHz	2.93 GHz+37%
L3 Cache	12 MB (total)	12 MB (total)
L2 Cache	256 kB (per core)	256 kB (per core)
Process	32 nm	32 nm
Architecture	Westmere-EP (2010−2011)	Westmere-EP (2010−2011)
PassMark	4,419	4,441

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Memory & Platform

Both processors use the LGA1366 socket with PCIe 4.0.

Feature	Xeon L5639	Xeon X5647
Socket	LGA1366	LGA1366
PCIe Generation	PCIe 4.0	PCIe 5.0+25%
Max RAM Speed	—	DDR3-1066
RAM Channels	—	3
ECC Support	—	Yes

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Advanced Features

Virtualization: not specified (Xeon L5639) / VT-x, VT-d (Xeon X5647). Primary use case: Xeon X5647 targets Workstation. Direct competitor: Xeon X5647 rivals Core i7-980X.