Is the Samsung 980 fast enough for gaming?

Yes. Its rated 3,100 MB/s read cuts load times well below SATA drives. It will not match PCIe 4.0 drives in benchmark numbers, but game loading gains are small in practice.

Does the Samsung 980 have a DRAM cache?

No. It uses host memory buffer instead of a dedicated DRAM chip. Everyday use is fine, but sustained large writes slow once the TurboWrite buffer fills.

Will it fit my laptop or desktop?

It is an M.2 2280 drive, so it fits slots that accept that length and the NVMe PCIe protocol. Check that your slot supports PCIe 3.0 or 4.0 NVMe before buying.

Is it worth choosing over a PCIe 4.0 drive?

If your board only has PCIe 3.0 slots, the 980 uses that bandwidth fully. On a PCIe 4.0 system, a 4.0 drive gives higher peak speeds for more demanding work.

What comes in the box?

The drive itself. Screws and mounting hardware are usually supplied with the laptop or motherboard, not the drive.

How does it compare with the Samsung 970 EVO?

The 980 is newer and slightly faster on paper, but like the 970 EVO it lacks a DRAM cache. The 970 EVO Plus has a DRAM cache and holds write speed better under sustained load.