Does the Ryzen 9 5900X need a graphics card?

Yes. It has no integrated graphics, so you need a discrete GPU for display output.

What motherboard socket does it use?

It uses AMD's AM4 socket. Many 400- and 500-series AM4 boards support it, though older boards may need a BIOS update.

The 5900X adds four cores and more cache, which helps in rendering, streaming and heavy multitasking. For gaming alone the difference is smaller.

It ships without a cooler. A strong air cooler or a 240 mm or larger liquid cooler is a sensible match for its heat output.

The 5950X has 16 cores and higher multi-core performance. The 5900X gives most of that for gaming and general work at a lower tier.

The boxed processor and documentation. A cooler is not included.

At GAMEIUN TECHNOLOGY, for $314.54, 47% under what the other stores charge, as of our latest check.

Rated 5 out of 5 from 5 ratings.

14 stores we checked sell it, including GAMEIUN TECHNOLOGY, Amazon, Newegg.com, eBay, serverblink.com.

$314.54at GAMEIUN TECHNOLOGYChecked 1 h ago

47% under what the other stores charge

Compared across 14 stores. Prices are checked against each store and labelled with when.