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Intel: Core i7-6700K and i5-6600K "Skylake" announced

Intel: Core i7-6700K and i5-6600K "Skylake" announced
Intel: Core i7-6700K and i5-6600K "Skylake" announced
Skylake is ready for the launch: Intel's Core i7-6700K and Core i5-6600K are the first two desktop processors based on the new microarchitecture. More models, including all mobile chips, will follow in the upcoming weeks and months. We have the first benchmarks.

Tick is followed by Tock: After Intel introduced a new manufacturing process with Broadwell last autumn, the chip giant now launches its second 14 nm generation with the completely reworked microarchitecture: Skylake.

Contrary to previous launches, Intel has not (yet) shown the full lineup today, but only announced two desktop processors. While the Core i7-6700K replaces the current top model Core i7-4790K, the Core i5-6600K replaces the Core i5-4690K.

Name CPU Clock Cores/Threads L3-Cache Memory TDP RRP
Skylake
Core i7-6700K 4.0 - 4.2 GHz 4/8 8 MB DDR3(L)-1600 / DDR4-2133 91 Watts $ 350
Core i5-6600K 3.5 - 3.9 GHz 4/4 6 MB DDR3(L)-1600 / DDR4-2133 91 Watts $ 243
Broadwell
Core i7-5775C 3.3 - 3.7 GHz 4/8 6 MB + 128 MB L4 DDR3(L)-1600 65 Watts $ 377
Core i5-5675C 3.1 - 3.6 GHz 4/4 4 MB + 128 MB L4 DDR3(L)-1600 65 Watts $ 277
Haswell
Core i7-4790K 4.0 - 4.4 GHz 4/8 8 MB DDR3(L)-1600 88 Watts $ 350
Core i5-4690K 3.5 - 3.9 GHz 4/4 6 MB DDR3(L)-1600 88 Watts $ 243

The new Skylake models hardly differ from their Haswell predecessors at first glance (Broadwell desktop processors were not launched everywhere): Clocks, TDP, size of the L3 cache and also the price of the i5 and i7 models are almost identical. Intel still promises a 10 percent higher CPU performance, which is a result of several microarchitectural improvements. However, the manufacturer did not want to go into the details – more information should follow at the IDF in San Francisco on August 18th.

Core i7-6700K
Core i7-6700K
Core i5-6600K
Core i5-6600K

We already have the first Cinebench R15 benchmark results from a Clevo barebone, but they do not really show a performance increase, at least in this benchmark. Both the Single as well as the Multi test determine similar results for the Core i7-6700K (179/879 points) and the i7-4790K (176/873 points), and the same applies for the i5-6600K (161/602 points) compared to the i5-4690K (155/600 points). It is possible that the promised IPC improvements will have a bigger effect in other applications or that upcoming BIOS updates will improve the results a bit – we will have to wait for further tests in the next couple of weeks before we can say more.

Cinebench R15
CPU Single 64Bit (sort by value)
Intel Skylake 6700K Sample
, 6700K
179 Points ∼82%
Intel Skylake 6600K Sample
, 6600K
161 Points ∼74%
Schenker XMG U505
GeForce GTX 970M, 4790S, Plextor PX-G256M6e
150 Points ∼69%
Schenker XMG U705
GeForce GTX 970M, 4790, Samsung SM951 MZHPV256HDGL m.2 PCI-e
159 Points ∼73%
Alienware 17 R2
GeForce GTX 980M, 4980HQ, Lite-On IT L8T-256L9G
155 Points ∼71%
MSI GT72-2QE16SR21BW
GeForce GTX 980M, 5700HQ, 2x Toshiba HG6 THNSNJ128G8NU (RAID 0)
145 Points ∼67%
Asus G751JY
GeForce GTX 980M, 4720HQ, Samsung SSD XP941 MZHPU256HCGL
141 Points ∼65%
CPU Multi 64Bit (sort by value)
Intel Skylake 6700K Sample
, 6700K
879 Points ∼20%
Intel Skylake 6600K Sample
, 6600K
602 Points ∼14%
Schenker XMG U505
GeForce GTX 970M, 4790S, Plextor PX-G256M6e
714 Points ∼16%
Schenker XMG U705
GeForce GTX 970M, 4790, Samsung SM951 MZHPV256HDGL m.2 PCI-e
765 Points ∼17%
Alienware 17 R2
GeForce GTX 980M, 4980HQ, Lite-On IT L8T-256L9G
670 Points ∼15%
MSI GT72-2QE16SR21BW
GeForce GTX 980M, 5700HQ, 2x Toshiba HG6 THNSNJ128G8NU (RAID 0)
723 Points ∼17%
Asus G751JY
GeForce GTX 980M, 4720HQ, Samsung SSD XP941 MZHPU256HCGL
673 Points ∼15%

One of the new features that we already know of is the support for DDR4 memory with an effective clock of up to 2133 MHz for the first time, while Haswell (except for the high-end platform Haswell-E) and Broadwell only support DDR3(L) modules. The additional memory bandwidth should be an advantage for the integrated HD Graphics 530 GPU in particular, which is also supposed to have 20 percent more shader units in the GT2 version (24 instead of 20 EUs with Haswell).

Being "K" models, both the i7-6700K and i5-6600K have free multipliers that allows easy overclocking. Contrary to Haswell, you can once again overclock Broadwell via base clock, but this should not be the case for the non-K chips that will follow later. Another highlight for fans of overclocking: The frequency of the DRAM memory can now be adjusted in finer 100/133 MHz steps, so it is easier to find the limit.

Skylake also follows the trend for faster flash storage with the significantly improved Z170 chipset, which is now equipped with 20 PCIe 3.0 lanes instead of just 8x PCIe 2.0 lanes (Z97). DMI was also updated to version 3.0, so the connection to the processor won't be a bottleneck. It is, however, a bit doubtful that the wider CPU interface would really provide enough bandwidth for all PCIe lanes: It seems that DMI 3.0 is only based on four PCIe 3.0 lanes and therefore barely reaches 4 GB/s, which could easily slow down a RAID configuration with multiple high-end M.2 SSDs. Still: It is roughly twice as fast compared to Haswell and should be more than sufficient for the next couple of years.

The processor itself still has 16 PCIe 3.0 lanes, which can be distributed (x16, x8/x8, x8/x4/x4) for the communication with a dedicated graphics card.

So what's in the pipeline for the upcoming weeks? The lineup is obviously not limited to the two chips that were announced today: If you believe the colleagues from CPU-World, there will already be many desktop and notebook chips across the whole TDP range in September. There were rumors in the past that there will also be Ultrabook CPUs with GT3e graphics (48 EUs plus eDRAM memory) as well as the new top IGP called GT4e (72 EUs plus eDRAM memory) – so Intel may be better able to compete with current dedicated mainstream GPUs.

 
 

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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2015 08 > Intel: Core i7-6700K and i5-6600K "Skylake" announced
Till Schönborn, 2015-08- 5 (Update: 2015-08- 5)
Andreas Osthoff
Andreas Osthoff - Senior Editor Business
I grew up with computers and modern consumer electronics. I am interested in the technology since I had my first computer, a Commodore C64, and started building my own PCs after that. My focus here at Notebookcheck is the business segment including mobile workstations, but I also like to test new mobile devices. It is always a great experience to review and compare new products. My free time is filled with a lot of sports, in the summer mainly on my bike.