Is the SanDisk Optimus GX 5100 a consumer or enterprise drive?

It is an enterprise data-center SSD from SanDisk's Optimus line. It uses the same M.2 2280 connector as consumer drives, so it works in a desktop, but its firmware and endurance ratings target servers.

Will it fit a standard M.2 slot?

Yes. It is an M.2 2280 drive, the common 22 mm wide, 80 mm long size found in most desktops and many laptops. Check that your slot supports PCIe NVMe rather than SATA.

Does it come with a heatsink?

No. It is a bare M.2 2280 drive, so it relies on your motherboard's heatsink or case airflow during long writes.

How does it compare with consumer PCIe 4.0 SSDs?

Consumer drives often post higher peak sequential numbers. The Optimus GX 5100 is tuned for sustained, consistent throughput and higher endurance, which matters more in servers than in a gaming PC.

Is it worth it over a cheaper consumer 1TB drive?

If you run a server, NAS cache or heavy write workload, the endurance and steady performance justify it. For everyday desktop use, a consumer drive gives similar real-world speed for less.