I purchased two of these mobos, which support three M.2 slots. Looks like two (normal?) long slots and a short slot near the battery. The short one is described differently in the literature. Are there advantages of one vs the other? Which provides the best performance? How do I Identify/find/purchase that short style M.2 device?

The ASUS PRIME B660-PLUS D4 motherboard has three M.2 slots with different configurations. The M.2_1 slot supports PCIe 4.0 x4 mode and is compatible with Intel 12th Gen processors. The M.2_2 slot, managed by the Intel B660 Chipset, also supports PCIe 4.0 x4 mode and accommodates longer M.2 devices (up to 22110). The M.2_3 slot supports PCIe 4.0 x2 mode and generally accepts standard lengths (up to 2280). For the best performance, use the M.2_1 or M.2_2 slots, as they both offer PCIe 4.0 x4 speeds. The shorter slot (M.2_3) has a lower performance (PCIe 4.0 x2). For purchasing, look for M.2 devices with the sizes 2242, 2260, or 2280 for the shortest slot (M.2_3).

The spec sheet states it accepts lga 1200 mounting bracket, is this accurate or is 1700 hardware required?

The spec sheet states that the ASUS PRIME B660-PLUS D4 motherboard is designed with dual mounting holes compatible with both Intel LGA1700 and LGA1200 cooling brackets.

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Main image of ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

Alt view image 2 of 7 - ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

Alt view image 3 of 7 - ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

Alt view image 4 of 7 - ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

Alt view image 5 of 7 - ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

Alt view image 6 of 7 - ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

Alt view image 7 of 7 - ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

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ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

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Option: PRIME B660-PLUS D4

PRIME B660-PLUS D4
PRIME B660M-A D4
PRIME B660M-A WIFI D4
PRO B660M-C D4-CSM
PROART B660-CREATOR D4
ROG STRIX B660-A GAMING WIFI D4
ROG STRIX B660-I GAMING WIFI
TUF GAMING B660M-PLUS WIFI D4

Intel LGA 1700 socket: Ready for 12th & 13th Gen Intel Core processors and Windows 11. BIOS update may be required to boot the 13th gen Intel Core desktop processors
Ultrafast connectivity: PCIe 4.0 slots, three M.2 slots, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C, Realtek 2.5Gb Ethernet and Thunderbolt 4 support
Comprehensive cooling: VRM heatsink, M.2 heatsink, PCH heatsink, hybrid fan headers and Fan Xpert 2+
ASUS OptiMem: Careful routing of traces and vias to preserve signal integrity for improved memory stability

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

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Model
Brand	ASUS
Model	PRIME B660-PLUS D4

Supported CPU
CPU Socket Type	LGA 1700 * Designed with dual mounting holes compatible with both Intel LGA1700 and LGA1200 cooling brackets.
CPU Type	Supports 13th / 12th Gen Intel Core Processors, Pentium Gold and Celeron Processors* May require a BIOS update to boot the 13th gen Intel® Core™ desktop processors. Visit: https://www.asus.com/news/oujwh1old5n6oglf/ Refer to www.asus.com for CPU support list.
Supported CPU Technologies	Supports Intel Turbo Boost Technology 2.0 and Intel Turbo Boost Max Technology 3.0* * Intel Turbo Boost Max Technology 3.0 support depends on the CPU types.

Chipsets
Chipset	Intel B660

Onboard Video
Onboard Video Chipset	Supported only by CPU with integrated graphic

Memory
Number of Memory Slots	4x288pin (DDR4)
Memory Standard	DDR4 5000(OC) / 4800(OC) / 4600(OC) / 4400(OC) / 4266(OC) / 4000(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3400(OC) / 3333(OC) / 3200 / 3000 / 2933 / 2800 / 2666 / 2400 / 2133* *Actual Memory frequency support depends on the CPU types and DRAM modules, for more information refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).
Maximum Memory Supported	128GB
Channel Supported	Dual Channel

Expansion Slots
PCI Express 4.0 x16	1 x PCI Express 4.0 x16 * Actual support may vary by CPU.
PCI Express 3.0 x16	1 x PCI Express 3.0 x16 * Supports x4 mode.
PCI Express x1	2 x PCIe 3.0 x1

Storage Devices
Serial ATA (SATA)	4 x SATA 6Gb/s
M.2	Intel 12th Gen Processors: M.2_1 slot (Key M), type 2242/2260/2280 - Intel 12th Gen processors support PCIe 4.0 x4 mode. Intel B660 Chipset: M.2_2 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 mode)* M.2_3 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x2 mode) * Intel Rapid Storage Technology supports Intel Optane Memory H Series on PCH attached M.2 slots.
Intel Optane Ready	Yes
SATA RAID	0/1/5/10

Onboard Audio
Audio Chipset	Realtek 7.1 Surround Sound High Definition Audio CODEC* * A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
Audio Channels	7.1 Channels

Onboard LAN
LAN Chipset	Realtek 2.5Gb Ethernet
Max LAN Speed	2.5Gbps

Rear Panel Ports
Back I/O Ports	1 x USB 3.2 Gen 2x2 port (1 x USB Type-C) 2 x USB 3.2 Gen 2 ports (2 x Type-A) 1 x USB 3.2 Gen 1 port (1 x Type-A) 2 x USB 2.0 ports (2 x Type-A) 1 x DisplayPort 1 x D-Sub port 1 x HDMI port 1 x Realtek 2.5Gb Ethernet port 3 x Audio jacks

Internal I/O Connectors
Onboard USB	1 x USB 3.2 Gen 1 connector (supports USB Type-C) 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports 2 x USB 2.0 headers support additional 4 USB 2.0 ports
Other Connectors	Fan and Cooling related 1 x 4-pin CPU Fan header 1 x 4-pin AIO Pump header 3 x 4-pin Chassis Fan headers Miscellaneous 3 x Addressable Gen 2 headers 2 x AURA RGB headers 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (AAFP) 1 x M.2 slot (Key E) 1 x S/PDIF Out header 1 x SPI TPM header (14-1pin) 1 x 20-3 pin System Panel header with Chassis intrude function 1 x Thunderbolt header

Software Feature
Windows 11	Supported

Physical Spec
Form Factor	ATX
LED Lighting	RGB
Dimensions (W x L)	12.0" x 9.6"
Power Pin	1 x 24-pin Main Power connector 1 x 8-pin +12V Power connector

Features
Features	Special Features: ASUS 5X PROTECTION III - DIGI+ VRM - Enhanced DRAM Overcurrent Protection - ESD Guards - LANGuard - Overvoltage Protection - SafeSlot Core+ - Stainless-Steel Back I/O ASUS Q-Design - Q-DIMM - Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow green]) - Q-Slot ASUS Thermal Solution - M.2 heatsink - VRM heatsink design AURA Sync - AURA RGB headers - Addressable Gen 2 headers Software Features: ASUS Exclusive Software Armoury Crate - AURA Creator - AURA Sync - Fan Xpert 2+ AI Suite 3 - Performance And Power Saving Utility TurboV EVO EPU DIGI+ VRM ASUS CPU-Z Norton Anti-virus software (Free Trial version) WinRAR UEFI BIOS ASUS EZ DIY - ASUS CrashFree BIOS 3 - ASUS EZ Flash 3 - ASUS UEFI BIOS EZ Mode BIOS: 128 Mb Flash ROM, UEFI AMI BIOS Manageability: WOL by PME, PXE Operating System: Windows 11 64-bit, Windows 10 64-bit

Packaging
Package Contents	Accessories: Cables 2 x SATA 6Gb/s cables Miscellaneous 1 x I/O Shield 1 x M.2 Rubber Package 2 x M.2 SSD screw packages 1 x M.2 Key E screw package Installation Media 1 x Support DVD Documentation 1 x User guide

Additional Information
First Listed on Newegg	September 03, 2024

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ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

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ASUS PRIME B660-PLUS D4 LGA 1700 (Intel 12th & 13th Gen) ATX Motherboard (PCIe 4.0, DDR4, 3xM.2 slots, 2.5Gb LAN, rear USB 3.2 Gen 2x2 Type-C, front USB 3.2 Gen 1 Type-C)

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