Product Showcase

Here you can see the PCI-Express slots. You will have excellent bus bandwidth for current generation graphics cards as you are using Gen 3.0 PCI Express lanes. The design is very recognizable and works really well in a black chassis we think. 
 

The CPU can be powered by one 4-pin or an 8-pin power connector, you can combine and connect them both as that will work just fine as well. 
 

So if you plan on using multiple graphics cards, 3-way Multi-GPU gaming is an option. Be sure you get the more expensive 40-lane processor with 3-way SLI/Crossfire though otherwise the last PCI-Express slot would run at 4 lanes. BTW just above the middle x16 slot you will notice a hatch/lid, remove it and you can install an M2 PCI-Express SSD. We'll show you that later on in the benchmarks.

• The eight core Core i7 5960X Haswell-E has 40 lanes (PCIe Gen 3.0) available.
• The six core Core i7 5930K Haswell-E has 40 lanes (PCIe Gen 3.0) available.
• The six core Core i7 5820K Haswell-E has 28 lanes (PCIe Gen 3.0) available.

Here you can see that most of the gaps can be filled with a plastic or rubber insert. Should help with airflow, but looks much better as well.
 

Overall an excellent looking motherboard, I would advise ASUS to look into making a snow white version from this one as well though. The beige brown color scheme is great news for Noctua cooler owners though.  

• Ultra-fast 10Gb/s USB 3.1 built in to the board
• Patent Pending OC Socket – Drive CPU and DDR4 performance beyond all expectations!
• TUF Detective – system information at your fingertips
• Thermal Armor - Total airflow-boosting heat dissipation
• TUF Fortifier - Damage Protection and Improved Cooling
• Thermal Radar 2 - Customized Fan Tuning, Complete System Cooling
• TUF Components [TUF 10K Ti-Caps, TUF Chokes & MOSFETs; Certified by Military-standard]

The Sabertooth X99 is a regular sized ATX (ATX Form Factor 12 inch x 9.6 inch ( 30.5 cm x 24.4 cm )). Asus also delivers dust plugs, tweaked the position of the circuit board's ventilation holes, and added adjustable ducting around the CPU socket.

Asked often, fan connector are:

• 1 x CPU Fan connector(s) (1 x 4 -pin)
• 1 x CPU OPT Fan connector(s) (1 x 4 -pin)
• 1 x CPU fan with PWM control
• 4 x Chassis Fan connector(s) (4 x 4 -pin)
• 5 x Assistant Fan connector(s) (5 x 4 -pin)