Question Can the HP Pavilion 790-0020 be customised?

[veltix01]

Dimensions (approximate): Height: 14.4 cm (5.7 in) Width: 41.0 cm (16.1 in) Depth: 2.23 cm (0.9 in)

Change its motherboard, so that i7 can fit in. Change gpu, psu, ram and internal storage.

 

[USAFRet]

Change its motherboard, so that i7 can fit in. Change gpu, psu, ram and internal storage.

Change all that, and its a whole new PC.
Might as well get a new case to hold all that new stuff.

A standard ATX motherboard (and everything else) won't work with that case.