Quick Verdict
An iconic processor that brought DDR4 to the mainstream, offering incredible overclocking headroom and gaming performance that still holds up for basic use.
Overview
Launch
Aug 5th, 2015
Status
End-of-lifeGeneration
Core i7 (Skylake)
Market
Desktop
The Intel Core i7-6700K is an enthusiast-grade quad-core desktop processor that became the definitive gaming CPU of its generation. Released as the flagship of the 6th Gen Skylake lineup, it introduced the new LGA 1151 socket and DDR4 memory support to the mainstream market. Operating at a high base clock of 4.0 GHz and boosting up to 4.2 GHz, it delivered exceptional single-threaded performance, dominating benchmarks at the time. With four cores and eight threads, it provided the multi-tasking headroom necessary for concurrent gaming and streaming. The unlocked multiplier made it a favorite among overclockers, capable of easily reaching 4.6 GHz or higher with adequate cooling. Its 91-watt TDP reflects its focus on raw performance. Paired with the Z170 chipset, the 6700K offered cutting-edge features like NVMe storage and advanced PCIe lane allocation, cementing its legacy as a highly capable, overclocking-friendly processor that pushed the limits of 14nm technology.
The Intel Core i7-6700K is a 6th Gen Skylake processor with 4 cores and 8 threads. It features a base clock of 4.0 GHz and boosts up to 4.
2 GHz. Unlocked for overclocking, it easily hits 4.6 GHz.
It remains a capable gaming CPU for budget builds on legacy platforms.
Specifications
Performance
Good for general tasks, but 4 cores struggle with heavy rendering.
Okay for light VMs, but limited by core count.
Still handles 60fps gaming well, but quad-core limitations show in modern CPU-heavy titles.
91W TDP is manageable, but power draw increases significantly when overclocked.
- •Can handle 60fps gaming with a mid-range GPU
- •Struggles with high-refresh-rate modern titles
- •Excellent for retro and esports gaming
- •No AI hardware
- •CPU inference is slow due to core count
Architecture
14nm
Process Node
Skylake
Codename
4C / 8T
Core Config
8 MB
L3 Cache
91 W
TDP
Architecture Overview
Fabricated on Intel's 14nm process, the Core i7-6700K utilizes the Skylake microarchitecture. It features 4 cores and 8 threads, sharing 8 MB of L3 SmartCache. A key architectural element is the unlocked multiplier, allowing enthusiasts to manually tune clock speeds and voltages for maximum performance. The chip supports dual-channel memory controllers, accommodating both DDR3L and DDR4, though DDR4 was the standard for its Z170 platform. It provides 16 PCIe 3.0 lanes directly from the CPU, optimized for a single high-end GPU and fast storage. The integrated HD Graphics 530, while present, is largely ignored by enthusiasts who pair this chip with discrete GPUs, though it operates dynamically up to 1150 MHz. The 91W TDP architecture allows for aggressive voltage curves and higher sustained boost clocks compared to the 65W variants. The use of thermal paste between the die and the integrated heat spreader, however, became a point of contention for extreme overclockers.
CPU Design
4 cores, 8 threads, unlocked.
Memory Subsystem
Dual-channel DDR3L or DDR4-2133.
PCIe & I/O
16 PCIe 3.0 lanes.
Overclocking
Fully unlocked multiplier.
- DDR4 memory support
- New LGA 1151 socket
- Improved IPC and clock speeds
Key Highlights
- Unlocked for overclocking
- High 4.0 GHz base clock
- Supports DDR4 memory
- Strong single-core performance
- Only 4 cores
- Runs hot when overclocked
- Uses thermal paste under IHS
- Older 14nm process
History
Launched in August 2015, the Core i7-6700K arrived to immense anticipation. It succeeded the highly popular Devil's Canyon (i7-4790K) and brought with it the long-awaited transition to DDR4 memory for mainstream users. During this period, quad-core processors were still the undisputed kings of gaming, and the 6700K was the fastest of them all.
It dominated the market, offering unmatched single-core speeds that game engines heavily relied upon. The launch of the Z170 chipset alongside it provided a massive upgrade in I/O, including vastly superior PCIe lane allocation for multi-GPU and NVMe setups. The 6700K era was a high point for Intel's desktop dominance, before the core count wars initiated by AMD's Ryzen in 2017.
It remains a legendary processor, representing a time when high clock speeds and refined architecture were the primary drivers of gaming performance, setting a standard for enthusiast CPUs that followed.
Improvements over Previous Generation
- DDR4 memory support
- New LGA 1151 socket
- Improved IPC and clock speeds
Alternatives & Competitors
Should You Buy It?
Recommended for the right buyer
Upgrading an existing LGA 1151 system for budget 1080p gaming.
Avoid if…
- Building a new system from scratch
- Modern AAA high-refresh gaming
- Heavy multi-threaded workloads
Use Cases
Interesting Facts
Launched the popular Z170 platform.
Base clock of 4.0 GHz was incredibly high for 2015.
Often overclocked to 4.6 GHz on air cooling.
Does not include a stock cooler.
Uses thermal paste between die and IHS, limiting extreme OC.
Features 8 MB of L3 cache.
Supports both DDR3L and DDR4 memory.
Launched in August 2015.
Part number SR2L0.
Integrated graphics boost to 1150 MHz.
People Also Ask
Is the i7-6700K good for gaming?
It can handle 60fps gaming, but struggles with modern high-refresh titles due to 4 cores.
Can the i7-6700K be overclocked?
Yes, it has an unlocked multiplier and easily hits 4.6 GHz.
Does the i7-6700K come with a cooler?
No, it requires an aftermarket cooler.
What socket does the i7-6700K use?
It uses the LGA 1151 socket.
Does the i7-6700K support DDR4?
Yes, it supports both DDR3L and DDR4.
What is the TDP of i7-6700K?
91 Watts.
How many cores does it have?
4 cores and 8 threads.
Can it run Windows 11?
Officially not supported, but runs perfectly fine.
Does it have integrated graphics?
Yes, Intel HD Graphics 530.
What is the max turbo frequency?
4.2 GHz.
Frequently Asked Questions
Does the i7-6700K support Hyper-Threading?
Yes, 4 cores and 8 threads.
Is delidding worth it for the 6700K?
Yes, replacing the internal TIM significantly lowers temps for overclocking.
Does it support ECC memory?
No, ECC is not supported.
What is the L3 cache size?
8 MB.
What chipsets are compatible?
Intel 100 Series (Z170, H110, etc.) and 200 Series.
Is it good for streaming?
It can handle 720p60 or 1080p30 streaming, but 4 cores limit multitasking.
Does it support Intel Optane?
No, Optane support started with 7th Gen.
What is the base clock?
4.0 GHz.
Does it have vPro?
No, 'K' series processors do not typically include vPro.
Is it unlocked?
Yes.