What is the write speed? only read speed in description

Just tested this card myself. Verified 250MBps read and 120MBps write. It's actually printed on the packaging, too; just not in the product description.

Does it work with the gh5 all-i 400mb/s?

I've bought 4 just for my gh5 camera to use it with all-i 400mb/s!!! Well 2 works perfectly the other 2 are completely broken. After few seconds I've pressed the record button the camera stops with the error message that the card doesn't support the bitrate. I've ordered two new cards to send back the two that are not working. So if you are lucky they works if you are not you can send them back. The card are v60 certified that means that they should support 60Mb/sec. 400mb/s = 400/8 = 50Mb/sec.!!! I think the price is great if they work!

No, el Zoom Q2n usa tarjetas MICRO SD, esta es SD estandar

Does this work for recording 4k video with a go pro 7 black?

Yes it is definitely fast enough fir 4k

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Lexar Professional 1667x 256GB SDXC UHS-II Card, Up To 250MB/s Read, for Professional Photographer, Videographer, Enthusiast (LSD256CBNA1667)

Lexar Professional 1667x 256GB SDXC UHS-II Card, Up To 250MB/s Read, for Professional Photographer, Videographer, Enthusiast (LSD256CBNA1667)

Product ID: 112928699

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Details

Brand
Lexar
Model name
1667x SD
Flash memory type
SDXC
Memory storage capacity
256 GB
Compatible devices
Camera

⚡Up to 250MB/s read speed

🎥Supports 4K, 3D & Full HD video capture

💾256GB large storage capacity

Description

⚡ Capture. Transfer. Create. Stay ahead with Lexar Professional 1667x!

RELIABLE COMPACT - Durable SDXC form factor with Class 10 speed ensures consistent performance on the go.
STREAMLINED WORKFLOW - High-speed file transfers accelerate your editing and sharing process dramatically.
PRO GRADE VIDEO READY - Seamlessly capture stunning 4K, 3D, and Full HD videos with DSLR and camcorders.
BLAZING FAST TRANSFERS - UHS-II U3 tech delivers up to 250MB/s read speeds for instant file access.
MASSIVE STORAGE FREEDOM - 256GB capacity lets you shoot longer without swapping cards—never miss a moment.

The Lexar Professional 1667x 256GB SDXC UHS-II card offers ultra-fast read speeds up to 250MB/s and a large 256GB capacity, designed for professional photographers and videographers. It supports high-quality 4K, 3D, and Full HD video capture, ensuring smooth performance with DSLR cameras and camcorders. Its high-speed transfer capabilities streamline your workflow, making it an essential tool for creative pros who demand speed and reliability.

Specifications

Colour	Black
Special feature	High-speed Performance; Faster Video Capture; For V60 Class
Read speed	250 Megabytes Per Second
Item weight	0.7 Ounces
Warranty type	Limited
Write speed	120 MB
Hardware interface	SDXC
Secure digital association speed class	Class 10
Product dimensions	32L x 24W millimetres
Manufacturer	Lexar International
UPC	843367114986
Global Trade Identification Number	00843367114986
Item model number	LSD256CBNA1667
RAM Size	256 GB
Are Batteries Included	No
Item Weight	19.8 g
Guaranteed software updates until	unknown

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