Intel Skylake Core i7-6700K Performance Review Published – Gaming Performance Better Than Core i7-5820K

Hassan Mujtaba
Posted 1 year ago

The latest Intel Skylake Core i7-6700K review has already been published by PCOnline, showcasing the overall performance improvement over Haswell, Haswell Refresh and Haswell-E generation of processors. There have already been several Core i7-6700K versus Core i7-4790K comparisons which we have seen previously but the latest performance review pits Intel’s latest mainstream core against the Haswell-E Core i7-5820K CPU to show some interesting results.

Image Credits: Expreview!

Intel Skylake Core i7-6700K vs Core i7-5820K Performance Unveiled

The Intel Core i7-6700K is the flagship 14nm processor of the Skylake-S desktop lineup. Its in fact the first of the two processors which will be launched on 5th August by Intel at Gamescom to kickstart the Skylake lineup and the Z170 chipset based motherboards. Starting off with the flagship Core i7-6700K CPU, we are looking at a quad core design with eight threads which shows a multi-threaded design. The chip features 8 MB of L3 cache and has clock speeds maintained at 4.0 GHz base and 4.2 GHz boost clock. The chip can support DDR4 2133 MHz memory and DDR3L 1600 MHz memory. The processor features the HD 530  graphics chip, clocked at 300 MHz base and 1150 MHz boost and full support for DirectX 12 API.

The processor was compared against the Core i7-5820K, Core i7-4790K and the Haswell based Xeon E3-1231 v3 processors. The Core i7-4790K which is the flagship Devil’s Canyon processor with a quad core and multi-threaded design. The Core i7-4790K was Intel’s first Haswell based 4 GHz processor plus a boost speed of 4.4 GHz (across all cores) and features 8 MB L3 cache. The processor has a TDP of 88W. The Core i7-5820K on the other hand is part of the HEDT Haswell-E lineup, featuring 6 cores and 12 threads with a fully unlocked design. The processor has clock speeds of 3.3 GHz base and 3.6 GHz boost. It comes in a 140W TDP package and has 15 MB L3 cache. The processor has a price of $398 US (box) which is $48 more compared to the $350 US Core i7-4790K. The Core i7-6700K will also stick close to the $350 US pricing but Haswell-E’s over platform cost will be quite a bit more compared to what you pay on the mainstream platforms. The processor does pack a lot of CPU  power due to its higher core count which will effectively be utilized in Windows 10 thanks to the DirectX 12 API.


The source was able to test the Devil’s Canyon and Skylake processors with their respective Z97 and Z170 motherboards. Both platforms were equipped with 8 GB of memory (DDR4 with Core i7-6700K and DDR3 with Core i7-4790K) while the Core i7-5820K was equipped with 16 GB of DDR4 memory on the X99 motherboard. For discrete graphics performance testing, a GeForce GTX 980 Ti graphics card was used along with a 1000W power supply. The platform used was Windows 7 so the performance gains with Windows 10 and Skylake will be far better in terms of what we get to see in the benchmarks today.

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The benchmarks performed show slight gains in CPU performance but some decent performance increases with discrete graphics cards in gaming. Coupled with a new CPU architecture, it was believed that Skylake will be an incremental gain in terms of performance by the actual IPC improvements lie in between 10-15% while Broadwell pushed for 5.5% IPC growth over Haswell Refresh. With DDR4 memory and next generation platform optimizations, we will see some decent gains but nothing incremental over Haswell. Overclocking performance on the other hand will see a major lift with 5.2 GHz being an easy job on air cooling. The chip will not get as hot as Haswell either due to the exclusion on FIVR units from the CPU die. This will grab the attention of several overclockers. Gaming performance shows the performance of Core i7-6700K being better than the six core Core i7-5820K. Since DirectX 12 leverages per core and multi-core performance, we can see even higher gains in gaming. The Core i7-6700K Skylake officially launches on Wednesday, next week, so stay tuned for more information.

Intel Core i7-6700K CPU Performance Benchmarks:

Intel Core i7-6700K Discrete Graphics Gaming Benchmarks:

Intel Core i7-6700K Power Consumption Numbers:

Intel Skylake Core i7-6700K and Core i5-6600K Specifications:

 Intel Core i7-6700KIntel Core i5-6600KIntel Core i7-5775CIntel Core i5-5675CIntel Core i7-4790KIntel Core i5-4690K
CodenameSkylake-SSkylake-SBroadwellBroadwellDevil's CanyonDevil's Canyon
CPU Cores4/84/44/84/44/84/4
GraphicsIntel 530Intel 530Iris Pro 6200Iris Pro 6200HD 4600HD 4600
Base Clock4.0 GHz3.5 GHz3.3 GHz3.1 GHz4.0 GHz3.5 GHz
Turbo Boost4.2 GHz3.9 GHz3.7 GHz3.6 GHz4.4 GHz3.9 GHz
L3 Cache8 MB6 MB6 MB4 MB8 MB6 MB
L4 CacheN/AN/A128 MB eDRAM128 MB eDRAMN/AN/A
Unlocked DesignYesYesYesYesYesYes
Launch Price$350 US$243 US$377 US$277 US$339 US$242 US
Intel Broadwell-E Core i7-6950X vs Core i7-5960X Benchmark Results Leaked - Overclocked Performance at 4.5 GHz Detailed

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