Compare Solid State Drives

Compare SANDISK Optimus GX PRO 850X 4TB vs WD_BLACK SN770 250GB

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  2. Solid State Drives
  3. SANDISK Optimus GX PRO 850X 4TB 🆚 WD_BLACK SN770 250GB
SANDISK Optimus GX PRO 850X 4TB and WD_BLACK SN770 250GB are both solid state drives with the same Interface (PCIe Gen4 x4) and Form Factor (M.2-2280). The main differences are in Capacity.
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SANDISK Optimus GX PRO 850X 4TB NVMe PCIe Gen4 x4 M.2-2280 SDSP81400TAN-000E0
SANDISK Optimus GX PRO 850X 4TB
WD_BLACK SN770 250GB NVMe Gen4 PCIe M.2 2280 WDS250G3X0E
WD_BLACK SN770 250GB
Prices
(Change region)
In Stock
$1,329.99
In Stock
Free shipping
$1,329.99
In Stock
$1,329.99
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Prices
(Change region)
In Stock
Free shipping
$82.12
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Brand
SanDisk
Brand
Western Digital
Model
  • SDSP81400TAN-000E0
  • SDSP81400TAN
Model
WDS250G3X0E
Release Date
📅 February 2026
Release Date
📅 January 2022
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews
User reviews
★★★★☆
(20 reviews)
Performance (Charts)
n/a
Performance (Charts)
66th / 1746
Effective Value
-
Effective Value
9th / 336
Price history
View Details ►
Price history
View Details ►
Price/GB
$0.33
Price/GB
$0.16
GB/$1
3.01
GB/$1
6.25
Series
-
Series
BLACK SN770 NVMe
Capacity
4000 GB
Capacity
250 GB
Interface
PCIe Gen4 x4
Interface
PCIe Gen4 x4
NVME
Yes
NVME
Yes
Form Factor
M.2-2280
Form Factor
M.2-2280
SSD Controller
-
SSD Controller
20-82-10081-A1
NAND Flash Type
-
NAND Flash Type
3D TLC BiCS5
Max Sequential Read
-
Max Sequential Read
Up to 4000 MB/s
Max Sequential Write
-
Max Sequential Write
Up to 2000 MB/s
MTBF
-
MTBF
1.75 Million hours
-
WD_BLACK SN770 500GB 500GB
$122.48
WD_BLACK SN770 1TB 1TB
$74.99
WD_BLACK SN770 2TB 2TB
$394.99

Comparison and key differences summary

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

  • Newer Product, it was released around 4 years later
  • More Capacity (+3750 GB available)

Buy now

Reasons to buy the WD_BLACK SN770 250GB:

  • 94% cheaper, you can save $1,247.87

Buy now

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