What is the benefit of this over sd (sdxc) cards? my nikon z6 ii supports both card types.

I was shocked at the write speed of this card on my Nikon D850. When a camera has a delay between each photo you shoot most think it's the camera. It's not, it's the speed the memory card can read the photo. I hesitated at the cost of this card but decided I'd bite the bullet and get it. I was amazed how fast I can shoot photo after photo. I wasn't even sure the auto focus had time to react. I have one of these and an SD card in my D850 and I have yet to use the SD card.

How does this compare to the model sdcfe-128g-ancnn? best buy is selling for $229.

SDCFE-064G-xxx NN *2 SDCFE-128G-xxx NN *2 SDCFE-256G-xxx NN *2 SDCFE-512G-xxx NN *2 *2 "xxx" is a region code: Japan: JN4 U.S.: ANC Canada: CN4 China: ZN4 Global: GN4 (Europe, Asia Pacific, Australia, Latin America, Middle East and Africa)

What is difference between new and old generation?

Capacity and Speed. And, if it's really 'OLD' then the I/O (Connector) is different.

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Description

⚡ Capture. Create. Conquer. The ultimate speed card for pros on the move.

RESCUE YOUR SHOTS - Includes RescuePRO Deluxe software to recover precious files, so you never lose a moment of your creative work.
LIGHTWEIGHT COMPACT - At just 12 grams and pocket-sized, this card fits effortlessly into your professional kit without weighing you down.
PRO GRADE RELIABILITY - Built to withstand the elements with waterproof design, ensuring your data stays safe no matter where your shoots take you.
BLAZING FAST TRANSFERS - Experience up to 1700MB/s read and 1400MB/s write speeds for seamless 4K RAW video capture and lightning-quick workflow.
UNIVERSAL COMPATIBILITY - Backwards-compatible with select XQD cameras via firmware update, future-proofing your gear investment.

The SanDisk 128GB Extreme Pro CFexpress Card Type B delivers professional-grade performance with up to 1700MB/s read and 1400MB/s write speeds, enabling smooth 4K RAW video recording and rapid data transfers. Its rugged, waterproof design ensures durability in demanding environments, while backwards compatibility with select XQD cameras and included RescuePRO Deluxe software provide versatility and peace of mind. Lightweight and compact, it’s engineered for the modern content creator seeking speed and reliability.

Specifications

Colour	Silver
Special features	Water Proof
Reading speed	1700 Megabytes Per Second
Item weight	12 Grams
Warranty type	Limited
Writing speed	1400 MB per second
Hardware interface	SDHC
Secure digital association speed class	Class 10
Product dimensions	39L x 30W millimeters
Manufacturer	Western Digital Technologies, Inc.
UPC	619659180805
Item model number	SDCFE-128G-GN4NN
Color	Silver
RAM Size	128 GB
Are Batteries Included	No
Lithium Battery Energy Content	2 Kilowatt Hours
Lithium Battery Packaging	Batteries packed with equipment
Lithium Battery Weight	2 Grams
Number Of Lithium Ion Cells	5
Number of Lithium Metal Cells	5
Item Weight	12 g

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