Compare Solid State Drives

Compare SANDISK Optimus GX PRO 850X 4TB vs XPG SX850 256GB

The main differences between SANDISK Optimus GX PRO 850X 4TB and XPG SX850 256GB are in Capacity, Interface, NVME and Form Factor.

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SANDISK Optimus GX PRO 850X 4TB

XPG SX850 256GB

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Brand

SanDisk

Brand

XPG

Model

SDSP81400TAN-000E0
SDSP81400TAN

Model

SSD-SX850-256G

Release Date

📅 February 2026

Release Date

-

* First availability for purchase, it may not correspond to the actual market launch date.

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User reviews

★★★★☆

(25 reviews)

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Price history

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Price history

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Price/GB

$0.33

Price/GB

-

GB/$1

3.01

GB/$1

-

Series

-

Series

SX850

Capacity

4000 GB

Capacity

256 GB

Interface

PCIe Gen4 x4

Interface

SATA 6 Gb/s

NVME

Yes

NVME

No

Form Factor

M.2-2280

Form Factor

2.5"

SSD Controller

-

SSD Controller

Silicon Motion

Max Sequential Read

-

Max Sequential Read

ATTO: Up to 560 MB/s
Crystal Disk Mark: Up to 550 MB/s

Max Sequential Write

-

Max Sequential Write

ATTO: Up to 520 MB/s
Crystal Disk Mark: Up to 500 MB/s

MTBF

-

MTBF

2,000,000 hours

-

Options (2)

	128 GB PCIe M.2 3x4
	128 GB 2.5 Inch

Comparison and key differences summary

Reasons to buy the SANDISK Optimus GX PRO 850X 4TB:

More Capacity (+3744 GB available)
Newer interface (PCIe Gen4 x4)

Reasons to buy the XPG SX850 256GB:

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