However, I haven't used special software for the transfers, only the OS tools. Transfers between my internal SSDs start at 1.4 GB/s and level off at 1 GB/s after a while, but my USB card reader transfers have achieved 370 MB/s at best and 320 MB/s with XQD. It's faster than I get with my 2016-7 XQD cards with my 1.5-year-old computer (I think the PCI express 2.0 of my cards is limiting the speed). But it sounds like you're getting very good performance especially considering the age of the computer. You could try copying a larger set of images to see a more robust estimate of the transfer speed. But for now I have way more cards than I need, so. If someone has a lot of complementary XQD readers (like me) then these new XQD cards could be an economical option as well (the Sony CFexpress/XQD reader is pretty expensive). I noticed that Sony's latest XQD 64/120/240 GB cards support PCI express 3.0 and are a bit faster than the ones from 2016-7 that I have. Most computers aren't optimized to give the highest speeds with these cards, but perhaps newer computers in a few years make better use of them. To my recollection the Sony reader supports faster speeds with USB-C and Thunderbolt. (I suppose I could contact Sony or Dell customer support to ask about the port / reader incompatibility.) The desktop does have Thunderbolt support (do not know which gen) so I could test it with another Thunderbolt device to see if the port is faulty. On computers with Thunderbolt 3, I recall a web site reporting transfer speeds up to 420 MB/s with CFexpress so my setup is a bit behind but the desktop is not too far behind for me to be bothered about it in real-world use. On my laptop I get about 280 MB/s with CFexpress. On my desktop, the copying speed to internal drive from Sony 128 GB CFexpress (Sony 128GB) is 370 MB/s and about 270-320 MB/s with Sony 32 GB and 64 GB XQD G-series cards (from 20). The USB C to C cable works on my laptop but for some reason it doesn't work with my desktop's USB-C port. I have the same reader and use it with the USB C to A cable that came with it on my desktop.