I have it. From the Amazon offer These cards deliver in a Dell M4700 built on O2Micro Card Reader for Windows 8.1 with Windows drivers when copying a large file read Iso scarce 73 MB / s and 11 MB Write / sec. In a Transcend TS-RDF5K USB3 card reader is even more. Nearly 88 MB / sec read and nearly 12 MB Write / sec. Almost double reading as indicated. Can you leave.