Does it support Ryzen 5000 series out of the box?

OP is correct. This board will not support 5900 series, however some older series such as 5600 will run out of the box. Flashing the BIOS or using an older gen Ryzen to update it is needed to support.

Plug and play with ryzen 5000 series out of box?

I purchased this board and came with A20 bios not compatible with my 5600x updated bios and everything now works 🙂

What psu does this need?

PSU would depend on the CPU and Graphics card you have installed. Generally, 750-850w is the sweet spot to give you plenty of power headroom. depending on the Graphics card/CPU you have. Remember, Power is DRAWN not given from the PSU. That means if a product needs 100w and you have a 850u, it will only draw 100w. Graphics cards are what eat your PSU power, as they range from 150-350w alone. Fans and AIO coolers. are also included in your power consumption. so remember that. Always leave plenty of headroom. for upgrades or power spikes. ( Especially if you're lucky enough to have a RTX 30XX CARD)

how many fan headers are there

6 System Fan headers. 1xCPU 1xPump

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Description

🔥 Power your build with MSI MAG B550 TOMAHAWK – where speed meets style!

BUILT TO PERFORM LAST - Enhanced thermal design with extended heatsinks and thick copper PCB keeps your system cool and reliable under heavy workloads.
NEXT LEVEL SPEED POWER - Supports AMD Ryzen 3rd Gen CPUs with DDR4 Boost up to 4866MHz OC for seamless multitasking and gaming dominance.
FUTURE PROOF CONNECTIVITY - Equipped with PCIe 4.0 and dual M.2 slots to handle the latest GPUs and lightning-fast storage without bottlenecks.
IMMERSIVE RGB CUSTOMIZATION - Mystic Light lets you personalize your rig with 16.8 million colors and 29 effects, syncing your setup to your vibe instantly.
UNRIVALED NETWORK PERFORMANCE - Dual LAN ports including 2.5G LAN ensure ultra-low latency and stable connections for pro-level online gaming and streaming.

The MSI MAG B550 TOMAHAWK is a high-performance ATX motherboard designed for AMD Ryzen 3rd Gen processors, featuring PCIe 4.0 support, dual M.2 slots, and up to 128GB DDR4 memory at 4866MHz OC. It offers advanced networking with 2.5G and Gigabit LAN, customizable RGB lighting via Mystic Light, and robust thermal solutions to ensure stable, powerful performance for gaming and professional workloads.

Specifications

Brand	MSI
Product Dimensions	30.48 x 3.81 x 24.38 cm; 1.3 kg
Batteries	1 Lithium Ion batteries required.
Item model number	911-7C91-004
Manufacturer	MSI
Series	MAG B550 TOMAHAWK
Colour	Black
Form Factor	ATX
Processor Type	Ryzen 9
Processor Socket	Socket AM4
Memory Technology	DDR4
Computer Memory Type	DDR4 SDRAM
Maximum Memory Supported	128 GB
Memory Clock Speed	4866 MHz
Graphics Card Interface	PCI Express
Wireless Type	2.4 GHz Radio Frequency, 5 GHz Radio Frequency
Number of USB 2.0 Ports	2
Number of HDMI Ports	1
Number of Ethernet Ports	1
Wattage	3600 watts
Are Batteries Included	No
Lithium Battery Energy Content	2 Kilowatt Hours
Lithium Battery Packaging	Batteries packed with equipment
Lithium Battery Weight	2 g
Number Of Lithium Ion Cells	5
Number of Lithium Metal Cells	5
Item Weight	1.3 kg
Guaranteed software updates until	unknown

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