Does the MSI Z790 GAMING PLUS WIFI motherboard also support 288pin DDR4 memory? Is it backwards compatible with memory?

The MSI Z790 GAMING PLUS WIFI motherboard supports DDR5 memory and does not mention compatibility with DDR4 memory.

How many memory slots does the MSI Z790 GAMING PLUS WIFI motherboard have and what is the maximum memory it supports?

The MSI Z790 GAMING PLUS WIFI motherboard has 4 memory slots and supports a maximum memory of 192GB.

The MSI Z790 GAMING PLUS WIFI motherboard supports 12th and 13th Gen Intel Core, Pentium Gold, and Celeron processors for the LGA 1700 socket.

double click image to zoom in

MSI Z790 GAMING PLUS WIFI LGA 1700 Intel Z790 SATA 6Gb/s ATX DDR5 PCI-E x16 slot Wi-Fi 6E 2.5Gbps LAN 4x M.2 EZ Debug LED Motherboard

Supports 12th/ 13th Gen Intel Core, Pentium Gold and Celeron processors for LGA 1700 socket
Latest DDR5 Memory:A huge step of DDR performance enhancement with the latest DDR5 memory
Lightning Gen 5:The latest PCIe 5.0 solution with up to 128GB/s bandwidth for
maximum transfer speed.
Extended Heatsink Design:MSI extended PWM heatsink and enhanced circuit design ensures even high-end processors to run in full speed.
Quadruple M.2 Connectors:Onboard quadruple M.2 connectors for the maximum storage performance.
M.2 Shield FROZR:M.2 thermal accessory keeps M.2 SSDs safe while preventing throttling, making them run faster.
Core Boost:With premium layout and fully digital power design to support
more cores and provide better performance.
2.5G Network Solution:Featuring premium 2.5G LAN to deliver better network
experience.
* BIOS update may be required when used with some 14th generation Intel Core processors, visit MSI support website for more information