The pictures upload fast from a SS HD when they've already been transfered to the drive. If reading directly from a CF or SD card, you want a USB-3 reader. USB-2 is slow, slow, slow and just not suitable for any imaging done with large Raw files, like my 25MB Raw files and/or 100+MB tiff files.
For both DOP 7 and 8, for fastest operation you need 8GB or RAM, a reasonably fast processor and a reasonably fast Graphics card with OpenCL enabled. The OpenCL thing is very important, because there's code to make use of both the G-card and the CPU for faster processing. Both DOP 7 and 8 are 64-bit, so operating in a 32-bit environment is not going to be good, if it works at all.
As a benchmark, my 64-bit, Win7, Lenova with 8GB of Ram and a SSD and medium level graphics card is processing 25-30MB Raw files in 4 to 8-sec. DOP 8 and achieved that with DOP 7 also.