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Detailed specifications
Here's the X99S MPower's full spec sheet in case we missed anything.

Platform Intel X99, socket LGA2011-v3
DIMM slots 8 DDR4, 64GB max
Expansion slots 4 PCIe 3.0 x16 via CPU
2 PCIe 2.0 x1 via X99
Storage I/O 1 SATA Express via X99 (shared with 2 SATA RAID 6Gbps)
1 M.2 2280 PCIe 3.0 x4 via CPU/PCIe 2.0 x2 via X99
6 SATA RAID 6Gbps via X99
4 SATA 6Gbps via X99
Audio 8-channel HD via Realtek ALC1150 with amplifier
Surround virtualization via Realtek drivers
Wireless NA
Ports 2 USB 3.0 via X99
2 USB 3.0 via ASMedia ASM1042AE
4 USB 3.0 via Via VL805
4 USB 3.0 via internal headers and X99
2 USB 2.0 via X99
4 USB 2.0 via internal headers and X99
1 Gigabit Ethernet via Intel I210-AT
1 analog front/headphone out (amplified)
4 configurable analog ports
1 digital S/PDIF out
Overclocking All/per-core Turbo multiplier: 12-80X
Ring ratio: 12-80X
Base clock: 90.9-300MHz
DRAM reference clock: 200, 266MHz
DRAM: 1333-3200MHz

CPU core voltage: 0.8-2.1V
CPU ring voltage: 0.8-2.1V
System agent voltage: 0.8-1.85V
CPU input voltage: 1.2-3.04V
CPU VCCIO voltage: 0.7-2.3V
DRAM A/B voltage: 0.6-2.0V
DRAM C/D voltage: 0.6-2.0V
DRAM A/B VPP voltage: 1.24-3.77V
DRAM C/D VPP voltage: 1.24-3.77V
DRAM A/B reference voltage: 0.12-1.235V
DRAM C/D reference voltage: 0.12-1.235V
PCH 1.05 voltage: 0.7-2.32V
PCH 1.5 voltage: 0.8-2.3V
Fan control 2 x CPU (PWM), 3 x SYS (DC and PWM):
Fixed speed or four-point manual profile

Our testing methods
If you've made it this far, you may be curious about what our test system looks like. Here it is:

We used the following configurations for testing.

Processor Intel Core i7-5960X
Motherboard Asus X99-A Asus X99 Deluxe Gigabyte X99-UD4 MSI X99S MPower
Firmware 1004 0501 F9a M30
Platform hub Intel X99 Intel X99 Intel X99 Intel X99
Chipset drivers Chipset: 10.0
Chipset: 10.0
Chipset: 10.0
Chipset: 10.0
Audio Realtek ALC1150 Realtek ALC1150 Realtek ALC1150 Realtek ALC1150
Memory size 16GB (4 DIMMs)
Memory type Corsair Vengeance LPX DDR4-2800 SDRAM
Memory config 2800MHz @ 16-18-18-36-2T 2800MHz @ 16-18-18-36-2T 2666MHz @ 16-18-18-36-2T 2666MHz @ 16-18-18-36-2T
Graphics Asus GeForce GTX 680 DirectCU II with 340.52 drivers
Storage Corsair Force Series GT 120GB
Samsung 840 Pro 256GB
Power supply Corsair AX850 850W
OS Microsoft Windows 8.1 Pro x64

Thanks to Asus, Cooler Master, Corsair, Intel, and Samsung 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. The full-load test combined Cinebench's multithreaded CPU rendering test with the Unigine Valley DirectX 11 demo running in a 1280x720 window. We reported the peak power consumption during the Cinebench run. Our idle measurement represents the low over a five-minute period sitting at the Windows desktop.

  • The Force GT 120GB SSD was used as the system drive for all tests. The Samsung 850 Series 512GB 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.

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.