We need a PC in our office to plug external hard disks and copy content in to local hard disk. 5 to 10 people will do it daily basis. This PC will not use for anything else. I am willing to configure PC cheapest as possible. I don't exactly know which is more important for coping files CPU or RAM beside USB 3 Hub + Internal HDD of course. But they are pretty standard.-Cheapest CPU i can find can do the job?-4GB memory will be enough?-To cut on my budget which one i should sacrifice CPU or RAM.Here a sample configuration i made:Case: Redrock C702BB Peak 300WMainboard: MSI A68HM-E33 V2 (2133 Mhz)CPU: AMD A6 6400K X2 (3.0 GHz, 1MB)RAM: 4 GB HI-LEVEL 1600 DDR3HDD: 1TB WD Blue 3,5 (64MB, 7200 RPM) (I choose this becouse i thought 64MB would benefit for copy performance)
PC Configration for File Copying
performance
The two bottlenecks of file copying are transfering from the external hard drive, and writing to the internal drive.  Everything else in a modern computer is much, much faster than the drives.My recommendation is that you go to a local store and buy the cheapest computer you can find that has one or more USB 3 ports (USB 2 is roughly the same speed as a hard drive; going with USB 3 will eliminate the connection as a potential bottleneck).When it comes to cheap computers, pre-built almost invariably costs less than building it yourself, unless you've got parts from another computer that you can re-use.