RetroArch PC. Required Proccesor and GPU?

What are the recommended PC spec for running retroarch at 1080p with CRT shaders & the handheld shader. Im looking at getting one of the GIGABYTE Brix system but not sure which one to get, is a Celeron 2955U 1.4GHz enough?

The CPU doesn’t really matter for shaders, but 1.4 ghz might be a bit slow for things like bsnes and mednafen-psx. For shaders, Intel HD4000 is good enough for non-halation cgwg CRT shader (and probably the new ones from maister and hyllian) at 1080p, and I think even cgwg+halation at 720p.