Intel X vs Intel K CPU gaming

Question

I'm looking to build a PC, and want eight RAM slots. For eight RAM slots, I need to choose motherboards with X-series chipsets, which requires an X-series CPU.

Intel example of K-series CPU: Core i7-9700 K

Intel example of X-series CPU: Core i7-9800 X

Q1: What suggested type is there currently?

Q2: Could it use an X-series CPU for gaming, even that's not the intended use for the X-series?

Q3: Would I lose a lot in choosing a X-series CPU, compared to the more normal K-series?

Answer 1

Could it use an X-series CPU for gaming, even that's not the intended use for the X-series?

An i7-9800X CPU would be significantly faster than an i7-9700k.

Beyond the performance improvements offered by the additional memory channels, and the additional cores available through Hyperthreading, there is no real difference between those two processors. Both of those processors can be considered a "gaming processor".

Any performance improvements an HEDT processor provides will be due to the additional memory bandwidth and PCIe bandwidth that LGA2066 allows.