Is this CPU compatible with motherboards that support the LGA1151 socket, or are there specific 300 Series motherboards recommended?

This CPU is only compatible with Intel 300 Series Motherboards.

Does this Intel Core i9-9900KF processor require a separate cooling solution since it is sold as OEM without a box?

Yes, the processor requires a separate cooling solution as it is sold as "Cooling device not included - Processor Only."

Questions & Answers: Intel Core i9-9900KF Desktop Processor i9-9th Gen, 8-Cores up to 5.0 GHz Turbo Unlocked Without Processor Graphics LGA1151 (300 Series) 95W BX80684I99900KF,OEM-No box

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Intel Core i9-9900KF Desktop Processor i9-9th Gen, 8-Cores up to 5.0 GHz Turbo Unlocked Without Processor Graphics LGA1151 (300 Series) 95W BX80684I99900KF,OEM-No box

9th Gen Intel Processor
Discrete GPU Required - No Integrated Graphics
Only Compatible with Intel 300 Series Motherboard
Socket LGA 1151 (300 Series)
Max Turbo Frequency 5.0 GHz
Unlocked Processor
DDR4 Support
Intel Optane Memory and SSD Supported
Intel Turbo Boost Technology 2.0 offers pro-level performance for gaming, creating, and overclocking
Cooling device not included - Processor Only

$299^.00 –