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Question Slow Data Transfer Speeds

Jul 18, 2022
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Hi, I've bought two pro grade v90 sd cards and their dual sd slot reader(USB 3.2 gen 2 reader) and I have a dedicated USB 3.1 and type C PCIe card
(Vantec 2-Port USB 3.1 Gen II Type-A/C PCIe Host Card). Yet I am seeing speeds of 42mb/sec. Can you please help me with this bottle neck?
 
Hi thank you for your reply!

Both photo and video files are transferring at the same rate and I've used crystaldiskmark to benchmark the SSD and my SD cards, the SD cards are coming out at 42mbs but they are rated for 300mbs with the minimum being 90mbs.