So I'm just gradually upgrading my PC and I ran into an issue. I don't know what size atx I have. The stock Mother board is from the lenovo H50-50 (came with i3 3.6GHz & 6bg of ram). What i got from CPU-z was
Model: Lenovo Sharkbay 31900058 STD
Chip set: Haswell
Read more: https://truenotebook.com/pc-case-standard-atx-or-micro-atx.html