Which is better for gaming?

Both are Gen4 NVMe drives and will load games quickly. The SanDisk Optimus 5100 has higher sequential speeds and four times the capacity, so it holds more games. The SN770 is fine if 1TB is enough.

Is the SanDisk worth the lower price?

Yes. At $99.99 at Central Computers as of November 6, 2026, it costs less than the $145.98 SN770 while offering 4TB and faster rated speeds.

Neither listing gives a terabytes-written endurance rating, so endurance can't be compared from the specs here. Capacity is the practical difference: 4TB spreads writes over more cells than 1TB.

Will either fit my laptop?

Both are M.2 2280, the common laptop and desktop size. Check that your slot supports PCIe Gen4 to get the rated speeds; both fall back to Gen3 speeds otherwise.

Do I need a heatsink?

Neither listing includes one. Gen4 drives can throttle under long sustained writes, so a motherboard heatsink or aftermarket pad helps in desktops and tight laptops.

WD_BLACK SN770 2TB NVMe SSD vs SanDisk Optimus 5100 4TB NVMe SSD

The SanDisk Optimus 5100 is the better buy for most people: 4TB, PCIe Gen4 speeds up to 6,900 MB/s read and 6,700 MB/s write, at $99.99 at Central Computers as of November 6, 2026. The WD_BLACK SN770 is a well-known gaming drive, but the listing here is the 1TB model at $145.98, so you pay more for a quarter of the capacity and slower sequential speeds. Choose the SN770 only if you specifically want the WD_BLACK name and 1TB is enough.

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