The P9X79-E WS offers highly scalable expandability with seven PCI-E Gen3 x16 slots, with support for up to 4-Way NVIDIA® GeForce® SLI™ or AMD CrossFireX™ in x16 links. It includes ASUS Dr. Power, which helps prevent sudden shutdowns with power supply health monitoring and event notifications, and new dual server-grade Intel® Ethernet. The motherboard features 91% power efficiency, enhanced heat removal, plus high speed storage and data transfers.
PCI Express 3.0 x16 links with 4-Way
NVIDIA® GeForce® SLI™ or AMD CrossFireX™

The P9X79-E WS has been designed to support powerful and flexible graphics configurations as required by professional users in sectors such as graphic and industrial design, research, and scientific modeling. Customers can opt for 4-Way NVIDIA®  GeForce® SLI™ or AMD CrossFireX™ multi-GPU setups, install seven individual graphics cards, or choose up to four double-deck cards.
ASUS Dr. Power offers effortless power supply health monitoring
Real time power supply health detection helps prevent sudden system shutdown and provides hassle-free notifications should power delivery be insufficient. Additionally, LED messages on the board clearly indicate any relevant power issues in the event your system fails to boot.
Better networking with new dual server-grade Intel®I210 LAN
Features twin Intel® Ethernet ports managed by the Intel® I210 controller, this design doubles available bandwidth, while lowering latency and packet loss rates. Customers gain faster, more stable, and more responsive networking, plus lower CPU utilization for improved system performance.

CPU Intel® Socket 2011 for 2nd Generation Core™ i7 Processors
Intel® Socket 2011 for Xeon® E5-1600/E5-2600 processors
Supports Intel® Turbo Boost Technology 2.0
* Refer to www.asus.com for CPU support list
Chipset Intel® X79 Express Chipset
Memory 8 x DIMM, Max. 64GB, DDR3 2400(O.C.)/2133(O.C.)/1866(O.C.)/1600/1333/1066 MHz, ECC, Non-ECC, un-buffered Memory. Quad channel memory architecture
Supports Intel® Extreme Memory Profile (XMP)
* Hyper DIMM support is subject to the physical characteristics of individual CPUs.
**Refer to www.asus.com for the memory QVL (Qualified Vendors Lists).
Expansion Slots 4 x PCIe 3.0 x16 slots (single@16, dual@x16/x16; Quad@x16/x16/x16/x16,blue),
3 x PCIe 3.0 x16 slot (@x8 mode,black)
* This motherboard is ready to support PCIe 3.0 SPEC. Functions will be available when using PCIe 3.0-compliant devices. Please refer to www.asus.com for updated details.
Multi-GPU support Supports 4-Way NVIDIA® GeForce® SLI™ Technology
Supports 4-Way AMD CrossFireX™ Technology