Run couple of times (6x in total, all from a USB key, 3x the following: start the PC>load the Resource Monitor>load CINEBENCH>run CINEBENCH AND 3x the following: start the PC>load the Resource Monitor>load CINEBENCH>run CINEBENCH 3x).
Literally I haven't seen disk activity higher that 6MB/s and even that was a peak. During the runs there is a minimal read activity but otherwise the score is non-changing regardless of the source.
Hope it helps.