Suggestions/help with my build

1) No need for 32GB unless you are doing a lot of multi-tasking...game + many tabs in a web browser + etc.
2) No need for chassis mods with Velox unless you want a certain aesthetic
3) The CPU you have will already boost to 4.4 GHz out of the box and the ASUS motherboard has MultiCore Enhancement, up to you if you want DS to push the speed much
4) The Velox case has a lot of airflow through it, especially with the extra fans you have selected.

Keep in mind that with SLI GPUs, the NVMe SSD will be put into the PCI-e 2.0 x4 slot, which has half of the bandwidth the cards interface is good for. That means that sequential reads and writes will be limited to about half of their ratings. Random reads and writes, however are not bottlenecked by the interface, so you will still get fantastic performance. But, if you were to hold out until August 5th when the Z170 motherboards and i7-6700K and i5-6600K processors are released, they have additional PCI-e 3.0 slots via the chipset to handle the full bandwidth of the card.

Frank,

The NVIDIA cards require a minimum of 8 PCI-e lanes in SLI, each (that's a hard minimum, you can't operate them on 4 lanes). AMD cards will operate on 4 lanes, but you start to see performance limitation when you restrict the bandwidth. Also, the way the motherboards are laid out, they will send 8 lanes to the first slot and have a lightweight switch send the remaining 8 lanes to either the first slot or the second slot.

The remaining 4 lanes from the processor, in Haswell and Broadwell, are PCI-e 2.0. They are (in the consumer space) always used as the DMI 2.0 interface to the chipset. The Chipset acts as a switch and has 8 lanes plus USB and SATA (some of those lanes may be used as extra SATA or USB) coming from it. 1 of those lanes will be for ethernet, and the remaining lanes will be split up amongst the I/O bridges, Wi-Fi, and other PCI-e slots. Some of the motherboards will use 4 of those lanes for a x4 PCI-e 2.0 slot for storage and network cards (most other kinds or cards do not need anywhere near the bandwidth...you could technically stick another NVIDIA card in it to act as a PhysX co-processor, but that just off-loads the physics processing from the GPUs processing the graphics for games that are using PhysX in their game engine). In Skylake, however, those extra 4 lanes will be PCI-e 3.0 (I'm guessing Intel will be calling the extended interface to the chipset DMI 3.0) where those lanes will be split into 26 High Speed I/O lanes, 20 of which can be PCI-e.





As you can see there are a lot of trade-offs as to how the I/O is allocated.

X99 or the upcoming Z170 will give you a LOT more room to expand when working with a PCIe SSD and multiple GPUs.

Once again... so much I dont know!