No, a standard motherboard from the 7th generation Intel won't support a 9th generation processor.
No, a standard motherboard from the 7th generation Intel won't support a 9th generation processor.
You can find the list of compatible CPUs by clicking the link labeled "X299 Dark" on the provided page.
X299 is compatible. Ensure you use an X-series CPU; the 9900K won't fit. Check the website for confirmation.