What types of processors are compatible with this motherboard?

This motherboard supports AMD Ryzen 9000, 8000, and 7000 Series processors.

What is the maximum memory supported by the GIGABYTE X870E AORUS ELITE X3D motherboard?

The maximum memory supported is 256GB.

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GIGABYTE X870E AORUS ELITE X3D AM5 AMD X870E ATX Motherboard

X3D Turbo Mode 2.0 : Incredible X3D performance unleashed by AI
DDR5 OC up to 9000MT/s
DriverBIOS : Wi-Fi Driver Pre-install, Power-On & EZ to Launch the Network.
AMD Socket AM5 : Supports AMD Ryzen 9000 / 8000 / 7000 Series Processors
Digital twin 16+2+2 phases VRM solution
Dual Channel DDR5 : 4*DIMMs with AMD EXPO Memory Module Support
M.2 EZ-Flex : high-efficiency heat dissipation & flexible patented baseplate for M.2 SSD
WIFI EZ-Plug : Quick and easy design for Wi-Fi antenna installation
M.2 EZ-Latch Click & Plus : Quick Release & Screwless Design on M.2 slots and heatsinks
Friendly UI : Multi-Theme, AIO Fan Control, and Q-Flash Auto Scan in BIOS and SW
Ultra-Fast Storage : 4*M.2 slots, including PCIe 5.0 x4
PCB Thermal Plate : 14% thermal improvement and reinforced motherboard stability.
Efficient Thermal : VRM Thermal Armor Advanced & M.2 Thermal Guard L & M.2 Thermal Guard Ext.
Fast Networking : 5GbE LAN & Wi-Fi 7 with directional Ultra-high gain antenna
Extended Connectivity : HDMI, Dual USB4 Type-C with DP-Alt, Front QC-USB 65W
PCIe UD Slot X : PCIe 5.0 x16 slot with 10X strength for graphics card