Which CPUs fit the MS33-AR1?

It uses the LGA 4677 socket for Intel Xeon Scalable processors of the Sapphire Rapids generation. It does not take consumer Core chips.

How much memory can it hold?

There are eight DDR5 DIMM slots on a single socket. That is roughly double the slot count of most desktop boards, which suits virtualization and database work.

No. Networking is a single RJ45 LAN port, so plan on wired Ethernet or adding a network card.

What storage can I connect?

Two M.2 slots take 2280 or 22110 drives, and SATA III ports support RAID 0, 1 and 10 through the onboard controller. There is no U.2 connector.

Is it good for gaming?

It works with a PCIe x16 graphics card, but it lacks Wi-Fi, USB-C and overclocking, and Xeon CPUs are tuned for servers. A consumer board is a better fit for gaming.

Retail boards typically ship with the board, SATA cables, an I/O shield and documentation. Confirm the accessory list with the seller before ordering.