Does it ship with a BIOS yet that doesn't require a firmware update for 14th gen CPUs?

BIOS update may be required when used with some 14th generation Intel Core processors, visit ASUS support website for more information.

What's the maximum M.2 format SSD width (in mm) that will fit the M.2_1 slot just below the CPU?

The maximum M.2 format SSD width that will fit the M.2_1 slot is 22mm.

Questions & Answers: ASUS Prime Z790M-Plus LGA 1700(Intel 14th & 13th & 12th Gen) microATX motherboard (PCIe® 5.0, 3xM.2 slots, 10+1 DrMOS, DDR5,1 Gb LAN, DP, USB 3.2 Gen 2x2 Type-C®,front USB 3.2 Gen 1 Type-C,

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ASUS Prime Z790M-Plus LGA 1700(Intel 14th & 13th & 12th Gen) microATX motherboard (PCIe® 5.0, 3xM.2 slots, 10+1 DrMOS, DDR5,1 Gb LAN, DP, USB 3.2 Gen 2x2 Type-C®,front USB 3.2 Gen 1 Type-C®, Thunderbolt™ (USB4) support)

BIOS update may be required when used with some 14th generation Intel Core processors, visit ASUS support website for more information
Intel LGA 1700 socket: Ready for 14th & 13th & 12th Gen Intel processors
Enhanced Power Solution: 10+1 DrMOS, 6-layer PCB, ProCool sockets, alloy chokes and durable capacitors for stable power delivery
Next-gen connectivity: PCIe 5.0,DDR5, Intel 1 Gb Ethernet, USB 3.2 Gen2x2 Type-C, front panel USB 3.2 Gen 1 Type-C, Thunderbolt (USB4) header support
ASUS OptiMem II: Careful routing of traces and vias, plus ground layer optimizations to preserve signal integrity for improved memory overclocking
Comprehensive cooling: Large VRM heatsink, PCH heatsink, hybrid fan headers and Fan Xpert 4(with AI Cooling II)

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