Core i5-6600K vs Xeon E5-2640

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 i5-6600K vs Xeon E5-2640 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 i5-6600K vs Xeon E5-2640: Pros, Cons & Final Verdict

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

Core i5-6600K

2015

Why buy it

✅Costs $643 less on MSRP ($242 MSRP vs $885 MSRP).
✅Delivers 265.5% more PassMark for each dollar spent, at 26.0 vs 7.1 PassMark/$ ($242 MSRP vs $885 MSRP).
✅Draws 91W instead of 95W, a 4W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon E5-2640 across 50 shared CPU benchmark tests.
❌Lower PassMark (6,301 vs 6,305).
❌Smaller total L3 cache (6 MB vs 15 MB).
❌Less compelling for workstation-style loads than Xeon E5-2640, which brings 6 cores / 12 threads and 40 PCIe lanes.

Xeon E5-2640

2012

Why buy it

✅Better for gaming: +14.6% higher average FPS across 50 shared CPU benchmark tests.
✅+150% larger total L3 cache (15 MB vs 6 MB).
✅Better for workstations and heavier parallel workloads: 6 cores / 12 threads, plus 40 PCIe lanes vs 0.
✅100+% more PCIe lanes (40 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Lower PassMark per dollar, at 7.1 vs 26.0 PassMark/$ ($885 MSRP vs $242 MSRP).

Quick Answers

So, is Xeon E5-2640 better than Core i5-6600K?

Not really, because they are built for different jobs. Xeon E5-2640 makes more sense for workstation-style multi-core throughput, while Core i5-6600K is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Xeon E5-2640 is the better pick. According to our tests, it delivers 14.6% 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, Xeon E5-2640 is the stronger fit. You are getting 0.1% better PassMark, backed by 6 cores and 12 threads. It also has the larger cache pool with 150% larger total L3 cache (15 MB vs 6 MB).

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

Xeon E5-2640 is still the much better call for a fresh build. Xeon E5-2640 comes in 265.7% more expensive on MSRP at $885 MSRP versus $242 MSRP, and it still gives you a 14.6% average FPS lead across 50 shared CPU game tests in our data. Core i5-6600K only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2015 platform. Even with 265.5% better value on paper (26.0 vs 7.1 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on LGA1151.

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

Core i5-6600K makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2015 vs 2012). That makes it the safer long-term bet.

Core i5-6600K vs Xeon E5-2640 Technical Specifications

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

Core i5-6600K

The Core i5-6600K is manufactured by Intel. It was released in 5 August 2015 (10 years ago). It is based on the Skylake (2015−2016) architecture. It features 4 cores and 4 threads. Base frequency is 3.5 GHz, with boost up to 3.9 GHz. L3 cache: 6 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 91 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 6,301 points. Launch price was $242.

Xeon E5-2640

The Xeon E5-2640 is manufactured by Intel. It was released in 6 March 2012 (13 years ago). It is based on the Sandy Bridge-EP (2012) architecture. It features 6 cores and 12 threads. Base frequency is 2.5 GHz, with boost up to 3 GHz. L3 cache: 15360 kB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA2011. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 6,305 points. Launch price was $162.

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Processing Power

The Core i5-6600K packs 4 cores / 4 threads, while the Xeon E5-2640 offers 6 cores / 12 threads — the Xeon E5-2640 has 2 more cores. Boost clocks reach 3.9 GHz on the Core i5-6600K versus 3 GHz on the Xeon E5-2640 — a 26.1% clock advantage for the Core i5-6600K (base: 3.5 GHz vs 2.5 GHz). The Core i5-6600K uses the Skylake (2015−2016) architecture (14 nm), while the Xeon E5-2640 uses Sandy Bridge-EP (2012) (32 nm). In PassMark, the Core i5-6600K scores 6,301 against the Xeon E5-2640's 6,305 — a 0.1% lead for the Xeon E5-2640. L3 cache: 6 MB (total) on the Core i5-6600K vs 15360 kB (total) on the Xeon E5-2640.

Feature	Core i5-6600K	Xeon E5-2640
Cores / Threads	4 / 4	6 / 12+50%
Boost Clock	3.9 GHz+30%	3 GHz
Base Clock	3.5 GHz+40%	2.5 GHz
L3 Cache	6 MB (total)	15360 kB (total)+150%
L2 Cache	256 kB (per core)	256 kB (per core)
Process	14 nm-56%	32 nm
Architecture	Skylake (2015−2016)	Sandy Bridge-EP (2012)
PassMark	6,301	6,305

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Memory & Platform

The Core i5-6600K uses the LGA1151 socket (PCIe 3.0), while the Xeon E5-2640 uses LGA2011 (PCIe 5.0) — making them incompatible on the same motherboard.

Feature	Core i5-6600K	Xeon E5-2640
Socket	LGA1151	LGA2011
PCIe Generation	PCIe 3.0	PCIe 5.0+67%
Max RAM Speed	—	DDR3-1333
Max RAM Capacity	—	384 GB
RAM Channels	—	4
ECC Support	—	Yes
PCIe Lanes	—	40

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Advanced Features

Virtualization: not specified (Core i5-6600K) / VT-x, VT-d (Xeon E5-2640). Primary use case: Xeon E5-2640 targets Server.

Feature	Core i5-6600K	Xeon E5-2640
Integrated GPU	—	No
Unlocked	—	No
AVX-512	—	No
Virtualization	—	VT-x, VT-d
Target Use	—	Server

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Value Analysis

At launch, the Core i5-6600K was priced at $242, while the Xeon E5-2640 came in at $885. On launch pricing ($242 vs $885), Core i5-6600K was $643 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i5-6600K delivers 26.0 pts/$ vs 7.1 pts/$ for the Xeon E5-2640 — making the Core i5-6600K the 114.1% better value option.

Feature	Core i5-6600K	Xeon E5-2640
MSRP	$242-73%	$885
Performance per Dollar	26.0+266%	7.1
Release Date	2015	2012

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