Here is a general NX configuration. We are an HP Workstation Partner and a Siemens PLM partner as well.
Intel QuadCore, high frequency processor 3.0 - 3.6. The majority of the time, NX is going to be harnessing one of those cores which is high you want it to be as fast as possible.
RAM = 16GB or more.
Graphics Card - Nvidia - At least 2GB of Memory and a decent amount of cuda cores.
Hard Drives - SSD is preferred and Now HP has a PCIE SSD, they call it their Z Turbo SSD, which 4X faster than traditional SATA SSDs
OS - Windows 64 Bit or Linux
Hope this helps! Let me know if you need additional information. firstname.lastname@example.org