What Enabling C6/C7 Low-Power States Do on the Core i7-4770K Haswell CPU

Test System

Before we look at the numbers, let’s take a brief look at the test system that was used. All testing was done on a fresh install of Windows 8 Enterprise 64-bit and benchmarks were completed on the desktop with no other software programs running. We completely overhauled our test setup for the Intel Core i7-4770K processor launch and this system is cutting edge with a digital power supply, 1.50V memory and an SSD with 19nm MLC NAND Flash.

The Intel Z87 platform that we used to test the Intel 1150 processors was running the Intel DZ87KL-75K motherboard with BIOS KL.0341 that came out on 5/30/2013. The Corsair Dominator Platnium 8GB 2133MHz memory kit was set to XMP 1.3 memory profile settings, which is 1.5v and 9-11-10-27 1T memory timings. The Corsair Neutron GTX 240GB SSD uses 19nm NAND and was using M310 firmware. The Intel HD Graphics 4600 iGPU was running 9.18.10.3165 graphics drivers.

Here is a quick look at the CPU-Z information for our main test system that we’ll be doing the testing on.

Intel LGA1150 Test Platform
Component	Brand/Model	Live Pricing
Processor	Intel Core i7-4770K	Click Here
Motherboard	Intel DZ87KL-75K	Click Here
Memory	8GB Donimator 2133MHz	Click Here
Video Card	N/A	Click Here
Hard Drive	Corsair Neutron GTX 240GB SSD	Click Here
Cooling	Intel Retail Boxed	Click Here
Keyboard	Corsair K90	Click Here
Mouse	Corsair M95	Click Here
Power Supply	Corsair AX860i	Click Here
Operating System	Windows 8 64-Bit	Click Here