Can someone tell me what the difference between this and the Gigabyte X570S Aorus Elite (rev. 1.1.)? Not sure what the .1 in the revision difference is?

I believe the difference is that the rev 1.1 is the wireless version of the same board.

Can I just put a Ryzen 7 5800X3D in this board out of the box or do I need to update the BIOS first?

Bios it comes with does not support 5800X3D out the box.

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GIGABYTE X570S AORUS ELITE (rev. 1.0) AMD Ryzen 3000 PCIe 4.0 SATA 6Gb/s USB 3.2 AMD X570S ATX Motherboard

Supports AMD Ryzen 5th Gen/ 4th Gen/ 3rd Gen/ 2nd Gen
Dual Channel ECC/ Non-ECC Unbuffered DDR4, 4 DIMMs
Twin 12+2 Phases Digital VRM Solution with 60A DrMOS
Fully Covered Thermal Design with High Coverage MOSFET Heatsinks
Triple Ultra-Fast NVMe PCIe 4.0/3.0 x4 M.2 with Thermal Guards
Fast 2.5GbE LAN with Bandwidth Management
SuperSpeed USB 3.2 Gen 2x2 TYPE-C delivers up to 20Gb/s transfer speeds
AMP-UP Audio with ALC1220-VB and WIMA Audio Capacitors
Smart Fan 6 Features Multiple Temperature Sensors, Hybrid Fan Headers with FAN STOP
RGB FUSION 2.0 with Multi-Zone Addressable LED Light Show Design, Support Addressable LED & RGB LED Strips
Q-Flash Plus Update BIOS without Installing the CPU, Memory and Graphics Card

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