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Detailed specifications
We've covered all the essential characteristics of the Z97 Extreme6 already, but here's the full spec sheet in case we missed anything:

Platform Intel Z97, socket LGA1150
DIMM slots 4 DDR3, 32GB max
Expansion slots 2 PCIe 3.0 x16 via CPU (x16/x0, x8/x8)
1 PCIe 2.0 x16 via Z97 (x2)
2 PCIe 2.0 x1 via Z97
1 Mini PCIe x1 via Z97
Storage I/O 1 M.2 Gen3 x4 via CPU (PCIe only)
1 M.2 Gen2 x2 via Z97
1 SATA Express via Z97
6 SATA RAID 6Gbps via Z97
4 SATA 6Gbps via ASMedia ASM1061
Audio 8-channel HD via Realtek ALC1150
2 x Texas Instruments NE5532 amplifier
Surround virtualization via Realtek drivers
Real-time multi-channel encoding via DTS Interactive
Ports 1 PS/2 keyboard/mouse
1 DisplayPort 1.2 via CPU
1 DVI-I via CPU
1 HDMI 1.3a via CPU
1 eSATA 6Gbps via ASMedia ASM1061
4 USB 3.0 via Z97 and ASMedia ASM1074 hub
2 USB 3.0 via ASMedia ASM1042AE
4 USB 3.0 via internal headers and Z97
1 USB 3.0 via internal port and Z97
4 USB 2.0 via internal headers and Z97
1 Gigabit Ethernet via Intel I218V
1 Gigabit Ethernet via Realtek RTL8111GR

1 analog front out
1 analog center/sub out
1 analog rear out/line in
1 analog side out
1 analog mic in
1 digital S/PDIF out
Overclocking All/per-core Turbo multiplier: 8-120X
CPU cache ratio: 8-120X
Base clock: 90-300MHz
CPU strap: 1, 1.25, 1.66, 2.5X
DRAM: 800-4000MHz

CPU voltage: 0.8-2V
CPU voltage additional offset: 0.001-1V
CPU input voltage: 1.2-2.3V
CPU input offset: 0-0.4V
CPU cache voltage: 0.8-2V
CPU cache voltage additional offset: 0.001-1V
System agent offset voltage: 0.001-1V
CPU analog offset voltage: 0.001-1V
CPU digital offset voltage: 0.001-1V
DRAM voltage: 1.165-1.8V
PCH 1.05V voltage: 0.977-1.322V
PCH 1.5V voltage: 1.366-1.696V
Fan control 2X CPU (combined), 3X SYS fans:
Predefined silent, standard, performance profiles
Manual profile with four speed/temperature points and full-speed temp

Our testing methods
We used the following system configurations for testing:

Processor Intel Core i7-4770K
Motherboard Asus Z87-PRO ASRock Z97 Extreme6 Asus Z97-A Biostar Hi-Fi Z97WE Gigabyte Z97X-UD5H MSI Z97 Gaming 7
Firmware revision 1802 1.4 0604 Z97AF516 F6b 1.1B1
Platform hub Z87 Express Z97 Z97 Z97 Z97 Z97
Chipset drivers Chipset: 10.0
RST: 13.0
Chipset: 10.0
RST: 13.0
Chipset: 10.0
RST: 13.0
Chipset: 10.0
RST: 13.0
Chipset: 10.0
RST: 13.0
Chipset: 10.0
RST: 13.0
Audio Realtek ALC1180 Realtek ALC1150 Realtek ALC892 Realtek ALC892 Realtek ALC1150 Realtek ALC1150
Memory size 16GB (2 DIMMs)
Memory type Corsair Vengeance Pro DDR3 SDRAM at 1600MHz
Memory timings 9-9-9-27-1T
Graphics Asus GeForce GTX 680 DirectCU II with 335.23 drivers
Storage Corsair Force Series GT 120GB
Samsung 830 Series 256GB
Power supply Corsair AX850 850W
Operating system Microsoft Windows 8.1 Pro x64

Thanks to Intel, Corsair, Samsung, and Asus for providing the hardware used in our test systems. And thanks to the motherboard makers for providing those.

We used the following versions of our test applications:

Some further notes on our test methods:

  • All testing was conducted with motherboard power-saving options enabled. These features can sometimes lead to slightly slower performance, particularly in peripheral tests that don't cause the CPU to kick into high gear. We'd rather get a sense of motherboard performance with real-world configurations, though; we're not as interested in comparing contrived setups with popular features disabled.

  • DiRT Showdown was tested with ultra detail settings, 4X MSAA, and a 1920x1200 display resolution. We used Fraps to log a 60-second snippet of gameplay from the demo's first race. To offset the fact that our gameplay sequence can't be repeated exactly, we ran this test five times on each system.

  • Power consumption was measured at the wall socket for the complete system, sans monitor and speakers, using a Watts Up Pro power meter. Our video playback load used this 1080p YouTube trailer for the movie Looper. The full-load test combined Cinebench's multithreaded CPU rendering test with the Unigine Valley DirectX 11 demo running in a 1280x720 window.

  • The Force GT 120GB SSD was used as the system drive for all tests. The Samsung 830 Series 256GB was connected as secondary storage to test Serial ATA and USB performance, the latter through a USAP-compatible Thermaltake BlacX 5G docking station. The Samsung SSD was secure-erased before each test that involved it. The Corsair drive was also wiped before we loaded our system image.

  • Ethernet performance was tested using a remote rig based on an Asus P8P67 Deluxe motherboard with an Intel 82579 Gigabit Ethernet controller. A single Cat 6 Ethernet cable connected that system to each motherboard.

  • Analog audio signal quality was tested using RMAA's "loopback" test, which pipes front-channel output through the board's line input. We tested while the system was loaded with Cinebench's multithreaded rendering test, the Unigine Valley benchmark, and a CrystalDiskMark 4KB random I/O test running on the Samsung SSD attached via USB 3.0.

  • Power consumption was tested using a Watt's Up Pro power meter. Our idle measurement represents the low over a five-minute period. For YouTube playback, we reported the median power consumption for the length of the video. For our full load test, we reported the peak power consumption during the Cinebench benchmark run.

The tests and methods we employed are publicly available and reproducible. All tests except power consumption were run at least three times. Unless otherwise indicated, we reported the median result for each test. If you have questions about our methods, hit our forums to talk with us about them.