You can upgrade the RAM to 8GB if you need to, which is another sign of the premium level we're at with this NAS drive. There are three USB ports, two Ethernet ports, and even a 10GbE SFP+ port for the fastest network needs. With encrypted read and write speeds of up to 312 MB/s, the TS-431X gives you a serious amount of speed to play around with, as well as a serious amount of security (there's also built-in fast disaster recovery). If you've already done a bit of dabbling in the world of NAS drives – maybe you're looking for a second one, or you want to replace and upgrade your current one – then may we suggest the QNAP TS-431X? A 4-bay, high-performance NAS enclosure that's going to be able to take care of a multitude of tasks at the centre of your home (or office) network.