All motherboards are built around the PCI specification, which hasn't changed in ages and isn't likely to change in the forseeable future, meaning any kernel will be able to detect and activate basic hardware. You may not be be able to achieve optimal performance with an older kernel, but the system should definitely work.
The kernel may lack support for some components on the motherboard, specifically:
- the built-in display adapter (not an issue; VGA fallback will work and Slackware doesn't even require a GUI during installation)
- the onboard storage controller
- the onboard USB3 controller (legacy emulation should cover the keyboard and mouse)
- the onboard Ethernet adapter (not required during the installation)
- chipset-specific sensors (not required during installation, or at all really)
Since it's always possible to upgrade to a recent stock kernel post-installation (Slackware is particularly nice in that regard), the only real problem would be an incompatible storage controller as that could prevent you from actually installing the OS. However, this is quite unlikely to be an issue, as even the most recent SATA controllers follow the AHCI specifications. Even software RAID should work, as
mdadm can parse Intel Rapid Storage metadata (unless Intel had made recent changes to the format that I'm not aware of).
In short, you're not likely to run into show-stopping issues, and even it you do, you could always generate an ISO/DVD of Slackware-current.
