A lot (most?) distros won't even boot on this board without the following kernel options being passed on the kernel command line:
acpi=off noapic
And yes, I've been running Gentoo linux on my RIVE for nearly a year with no problems at all...all hardware devices fully supported and functional.
CPU: Intel Core i7-3930K(C2)@3.2GHz OC(4.2GHz)
Motherboard: ASUS Rampage IV Extreme X79 (bios 2105)
Video: EVGA GeForce GTX560 Ti 448 Cores
Memory: 32Gb G.SKILL Ripjaws Z Series 16GB F3-17000CL9Q-16GBZH
HDD: Seagate ST2000DM001 Barracuda 7200RPM 2 TB
PSU: Seasonic 660W 80 Plus Gold
Case: LIAN LI PC-8NW USB3.0 Black Aluminum
CPU Cooler: Noctua NH-D14 SE2011
Monitor: Dell UltraSharp U2412M
OS: Gentoo Linux 64-bit/Windows 7 Pro 64-bit SP1