SanDisk 256GB Extreme PRO SDXC card

[Yella Fella]

Forgive me if this is the wrong thread for removal storage.

I bought 2x of these cards recently and they are rated at 200MB/s though both had the exact same serial number on them.

I ran some tests, and bought again a new memory card reader, SanDisk Extreme PRO SD UHS-II USB-C Card Reader. However, I'm only getting max speeds of around 90MB/s which sounds a bit sussed.

Do anyone else have these cards? Do you get consistently the same speeds as me or more closer to 200?

 

[Yella Fella]

Read speeds as they have always been fine on camera.

 

[Yella Fella]

That's what I thought. I've tried it on both my Macbook Pro and Windows PC via USB-C. I suspect fake cards, never mind I've returned them now.