Core i5-6600K vs Xeon E3-1275L v3

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 E3-1275L v3 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 E3-1275L v3: 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 $108 less on MSRP ($242 MSRP vs $350 MSRP).
✅Delivers 44.0% more PassMark for each dollar spent, at 26.0 vs 18.1 PassMark/$ ($242 MSRP vs $350 MSRP).

Trade-offs

❌Worse for gaming: lower average FPS than Xeon E3-1275L v3 across 50 shared CPU benchmark tests.
❌Lower PassMark (6,301 vs 6,327).
❌Smaller total L3 cache (6 MB vs 8 MB).
❌Less compelling for workstation-style loads than Xeon E3-1275L v3, which brings 4 cores / 8 threads and 16 PCIe lanes.
❌102.2% higher power demand at 91W vs 45W.

Xeon E3-1275L v3

2014

Why buy it

✅Better for gaming: +8.9% higher average FPS across 50 shared CPU benchmark tests.
✅+33.3% larger total L3 cache (8 MB vs 6 MB).
✅Better for workstations and heavier parallel workloads: 4 cores / 8 threads, plus 16 PCIe lanes vs 0.
✅Draws 45W instead of 91W, a 46W reduction.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Lower PassMark per dollar, at 18.1 vs 26.0 PassMark/$ ($350 MSRP vs $242 MSRP).

Quick Answers

So, is Xeon E3-1275L v3 better than Core i5-6600K?

Not really, because they are built for different jobs. Xeon E3-1275L v3 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 E3-1275L v3 is the better pick. According to our tests, it delivers 8.9% 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 E3-1275L v3 is the stronger fit. You are getting 0.4% better PassMark, backed by 4 cores and 8 threads. It also has the larger cache pool with 33.3% larger total L3 cache (8 MB vs 6 MB).

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

Xeon E3-1275L v3 is still the much better call for a fresh build. Xeon E3-1275L v3 comes in 44.6% more expensive on MSRP at $350 MSRP versus $242 MSRP, and it still gives you a 8.9% average FPS lead across 50 shared CPU game tests in our data. Core i5-6600K only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2015 platform. Even with 44.0% better value on paper (26.0 vs 18.1 PassMark/$), 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 2014). That makes it the safer long-term bet.

Core i5-6600K vs Xeon E3-1275L v3 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 E3-1275L v3

The Xeon E3-1275L v3 is manufactured by Intel. It was released in 2015-01-01. It features 4 cores and 8 threads. Base frequency is 2.7 GHz, with boost up to 3.9 GHz. L3 cache: 8 MB Intel® Smart Cache. Built on 22 nm process technology. Socket: LGA1150. Thermal design power (TDP): 45 Watt. Memory support: DDR3-1333, DDR3-1600. Passmark benchmark score: 6,327 points. Launch price was $800.

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Processing Power

The Core i5-6600K packs 4 cores / 4 threads, matching the Xeon E3-1275L v3's 4 cores. Boost clocks reach 3.9 GHz on the Core i5-6600K versus 3.9 GHz on the Xeon E3-1275L v3 — identical boost frequencies (base: 3.5 GHz vs 2.7 GHz). The Core i5-6600K is built on the Skylake (2015−2016) architecture. In PassMark, the Core i5-6600K scores 6,301 against the Xeon E3-1275L v3's 6,327 — a 0.4% lead for the Xeon E3-1275L v3. L3 cache: 6 MB (total) on the Core i5-6600K vs 8 MB Intel® Smart Cache on the Xeon E3-1275L v3.

Feature	Core i5-6600K	Xeon E3-1275L v3
Cores / Threads	4 / 4	4 / 8
Boost Clock	3.9 GHz	3.9 GHz
Base Clock	3.5 GHz+30%	2.7 GHz
L3 Cache	6 MB (total)	8 MB Intel® Smart Cache+33%
L2 Cache	256 kB (per core)	—
Process	14 nm-36%	22 nm
Architecture	Skylake (2015−2016)	—
PassMark	6,301	6,327
Geekbench 6 Single	—	900
Geekbench 6 Multi	—	3,000

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Memory & Platform

The Core i5-6600K uses the LGA1151 socket (PCIe 3.0), while the Xeon E3-1275L v3 uses LGA1150 (PCIe 3.0) — making them incompatible on the same motherboard.

Feature	Core i5-6600K	Xeon E3-1275L v3
Socket	LGA1151	LGA1150
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	—	DDR3-1600
Max RAM Capacity	—	32 GB
RAM Channels	—	2
ECC Support	—	Yes
PCIe Lanes	—	16

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Advanced Features

Virtualization: not specified (Core i5-6600K) / VT-x, VT-d (Xeon E3-1275L v3). The Xeon E3-1275L v3 includes integrated graphics (Intel HD Graphics P4600), while the Core i5-6600K requires a dedicated GPU. Primary use case: Xeon E3-1275L v3 targets Low Power Server. Direct competitor: Xeon E3-1275L v3 rivals Xeon E3-1270 v3.

Feature	Core i5-6600K	Xeon E3-1275L v3
Integrated GPU	—	Yes
IGPU Model	—	Intel HD Graphics P4600
Unlocked	—	No
AVX-512	—	No
Virtualization	—	VT-x, VT-d
Target Use	—	Low Power Server

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Value Analysis

At launch, the Core i5-6600K was priced at $242, while the Xeon E3-1275L v3 came in at $350. On launch pricing ($242 vs $350), Core i5-6600K was $108 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i5-6600K delivers 26.0 pts/$ vs 18.1 pts/$ for the Xeon E3-1275L v3 — making the Core i5-6600K the 36.1% better value option.

Feature	Core i5-6600K	Xeon E3-1275L v3
MSRP	$242-31%	$350
Performance per Dollar	26.0+44%	18.1
Release Date	2015	2014

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