Core i5-6600K vs Opteron 6276

Core i5-6600K vs Opteron 6276 Performance Spectrum

Core i5-6600K

4 / 4

6,301

0.0%

6,348

+0.7%

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About PassMark

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 Opteron 6276 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 Opteron 6276: 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 $546 less on MSRP ($242 MSRP vs $788 MSRP).
✅Delivers 223.2% more PassMark for each dollar spent, at 26.0 vs 8.1 PassMark/$ ($242 MSRP vs $788 MSRP).
✅Draws 91W instead of 115W, a 24W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Opteron 6276 across 50 shared CPU benchmark tests.
❌Lower PassMark (6,301 vs 6,348).
❌Smaller total L3 cache (6 MB vs 8 MB).
❌Less compelling for workstation-style loads than Opteron 6276, which brings 16 cores / 16 threads.

Opteron 6276

2011

Why buy it

✅Better for gaming: +16.9% 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: 16 cores / 16 threads.

Trade-offs

❌Lower PassMark per dollar, at 8.1 vs 26.0 PassMark/$ ($788 MSRP vs $242 MSRP).
❌26.4% higher power demand at 115W vs 91W.

Quick Answers

So, is Opteron 6276 better than Core i5-6600K?

Not really, because they are built for different jobs. Opteron 6276 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, Opteron 6276 is the better pick. According to our tests, it delivers 16.9% 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, Opteron 6276 is the stronger fit. You are getting 0.7% better PassMark, backed by 16 cores and 16 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?

Opteron 6276 is still the much better call for a fresh build. Opteron 6276 comes in 225.6% more expensive on MSRP at $788 MSRP versus $242 MSRP, and it still gives you a 16.9% average FPS lead across 50 shared CPU game tests in our data. Core i5-6600K only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2015 platform. Even with 223.2% better value on paper (26.0 vs 8.1 PassMark/$), 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 2011). That makes it the safer long-term bet.

Core i5-6600K vs Opteron 6276 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.

Opteron 6276

The Opteron 6276 is manufactured by AMD. It was released in 14 November 2011 (14 years ago). It is based on the Interlagos (2011−2012) architecture. It features 16 cores and 16 threads. Base frequency is 2.3 GHz, with boost up to 3.2 GHz. L3 cache: 8 MB (total). L2 cache: 2 MB (per module). Built on 32 nm process technology. Socket: G34. Thermal design power (TDP): 115 Watt. Memory support: DDR3. Passmark benchmark score: 6,348 points. Launch price was $119.

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Processing Power

The Core i5-6600K packs 4 cores / 4 threads, while the Opteron 6276 offers 16 cores / 16 threads — the Opteron 6276 has 12 more cores. Boost clocks reach 3.9 GHz on the Core i5-6600K versus 3.2 GHz on the Opteron 6276 — a 19.7% clock advantage for the Core i5-6600K (base: 3.5 GHz vs 2.3 GHz). The Core i5-6600K uses the Skylake (2015−2016) architecture (14 nm), while the Opteron 6276 uses Interlagos (2011−2012) (32 nm). In PassMark, the Core i5-6600K scores 6,301 against the Opteron 6276's 6,348 — a 0.7% lead for the Opteron 6276. L3 cache: 6 MB (total) on the Core i5-6600K vs 8 MB (total) on the Opteron 6276.

Feature	Core i5-6600K	Opteron 6276
Cores / Threads	4 / 4	16 / 16+300%
Boost Clock	3.9 GHz+22%	3.2 GHz
Base Clock	3.5 GHz+52%	2.3 GHz
L3 Cache	6 MB (total)	8 MB (total)+33%
L2 Cache	256 kB (per core)	2 MB (per module)+700%
Process	14 nm-56%	32 nm
Architecture	Skylake (2015−2016)	Interlagos (2011−2012)
PassMark	6,301	6,348

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Memory & Platform

The Core i5-6600K uses the LGA1151 socket (PCIe 3.0), while the Opteron 6276 uses G34 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Core i5-6600K	Opteron 6276
Socket	LGA1151	G34
PCIe Generation	PCIe 3.0+50%	PCIe 2.0

💰

Value Analysis

At launch, the Core i5-6600K was priced at $242, while the Opteron 6276 came in at $788. On launch pricing ($242 vs $788), Core i5-6600K was $546 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i5-6600K delivers 26.0 pts/$ vs 8.1 pts/$ for the Opteron 6276 — making the Core i5-6600K the 105.5% better value option.

Feature	Core i5-6600K	Opteron 6276
MSRP	$242-69%	$788
Performance per Dollar	26.0+221%	8.1
Release Date	2015	2011

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