What happen if I buy the ssd card and is not compatible?

Cheap your motherboard manual for PCI Express 4.0 b or m keys here. If you have both then you can only use it on one not both here. Also if your thinking about randisk ssd/ram combination chipsets if your into data and building prototypes for mobos and future m1x like ddr5 RAM silicon cpu combination like also the one above here if you want to build a custom PCB design chipset or add-on card here before doing anything involving soldering on chips to a circuit board here from a 3d printer.

What is the difference between this and the $259 sabrent 2tb rocket nvme pcie besides the label appears different (black/blue to this plain white)?

The white one is QLC, the dark one is TLC. QLC means each cell of the NAND flash can store 4 bits per cell, TLC means 3. TLC tends to be faster and can last longer.

besides the price difference, is there another difference between the 1tb white variation from the black variation?

The speed difference is big but only if your motherboard and CPU can handle it. Don't expect PS5 lighting quick load times though as combination direct drive like ssds found on the Xbox series X for the pc anytime soon though as Microsoft want to push console sales for at least a year maybe more if the economy gets worse as consoles are war cheaper than a pc or laptop here for just gaming alone. Pcie 6.0 will have the combination ram/SSD designs by 2023 as Intel said in Soeul in 2019 as standard for this change now found in the next gen consoles now as itx and smaller designs for pc desktops are becoming a thing here for minimalistic looks and for a wireless desktop workstation set-up and for gamers too as the gpu and cpu become slowly more merged together like the SSD and ram chips have become for the consoles as there will a radical change in motherboard designs in the next 2-3 years for this GPU and CPU merge to occur here like seen on the consoles for smaller more mobile workstations like in and ryzen nuc with it's Apu. Laptops might be phassed out for foldable phone/PCs depending on how the surface neo and lenovo foldable does once the SSD ram and cpu and gpu both merge on the pc side for things to get rid for unnecessary clutter here. The batteries though are the main problem still. They need to last for 30 days on full 100 power cpu gpu ram SSD draw for this to become a fully wireless mobile PC world though.

Item Weight	2.4 Ounces
Memory Storage Capacity	1 TB
Compatible Devices	This drive is compatible with servers and arrays that accept M.2 2280 PCIe drives
Hard Disk Form Factor	2280 Inches
Data Transfer Rate	3200 Megabytes Per Second
Global Trade Identification Number	00840025249578
Connectivity Technology	NVMe M.2
Manufacturer	SABRENT
UPC	840025249578
RAM	512 GB
Hard Drive	1 TB Solid State Drive
Series	SB-RKTQ-1TB
Item model number	SB-RKTQ-1TB
Item Weight	2.4 ounces
Product Dimensions	3.15 x 0.86 x 0.11 inches
Item Dimensions LxWxH	3.15 x 0.86 x 0.11 inches
Hard Drive Interface	NVMe
ASIN	B07ZZYWTBP
Is Discontinued By Manufacturer	No
Date First Available	November 4, 2019

SABRENT Rocket Q 1TB NVMe PCIe M.2 2280 Internal SSD High Performance Solid State Drive R/W 3200/2000MB/s (SB-RKTQ-1TB)

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