These details can all be found on the DS Mechanical homepage.
The minimum required system specs for DSM version 2 onwards (on OS Windows 7 and up) are:
Requires Full DirectX® 9c, Shader Model 3.0 hardware support, 512 MB of graphics memory or higher, 32 bits per pixel, 1024x768 minimum resolution.
ATI® Radeon R300, R420, R520, R600, or R700 series.
Radeon 9x00 cards (9700, 9800, …) or newer
NVIDIA GeForce® FX, 6, 7, or 8 series. NVIDIA FX5200s or newer
AMD FireGL™ T2-128 or higher (including the ‘Mobility’ series for laptops)
Pentium® 4 2.0 GHZ or Athlon® 2000+ or faster, 64-bit (x64) processor
4 GB RAM or higher
In general, an integrated graphics card (like Intel HD 4000) or discrete graphics (like AMD R5 M230) with DirectX11 support and a minimum 2GB video memory renders objects well.
CPU wise, Intel i5 processors (4th Generation, Quad core) provides enough power for quick geometry manipulations and allows background CPU intensive processes to run without any noticeable lag.
RAM: the more, the better. As a minimum: 4GB.
A product which roughly matches the recommended specs (not DesignSpark endorsed): Lenovo ThinkPad T430 https://www.amazon.co.uk/dp/B01C6WNEL6/
Automatic graphics compatibility checker: http://files.spaceclaim.com/DxDiagTool.exe