What Motherboard Size do i have?

[Yuri32298]

i have a Dell Optiplex GX260 Desktop and i wanted to upgrade the Motherboard but i don't know what size will fit in the case.

 

[MagicPants]

Generally speaking you can tell the mobo size by the number of expansion slots it has:
1 slot = mini ITX
4 slots = microATX
7 slots = ATX

BUT... one caveat
You need to count gaps, sometimes they'll only put a slot every other space(usually for dual slot video cards).

 

[Yuri32298]

http://www.ebay.com/itm/Dell-Optiplex-GX260-Motherboard-62YVH-2X378-Pentium-4-Socket-478-w-Warranty-/231190250992

This is the same motherboard i have but i don't know what size the motherboard is.

 

[MagicPants]

Though the GX260 mobo looks a bit custom. Most atx cases (all non-custom) will also take a Micro ATX mobo, so you might be safer going with that.

Have you considered buying a new case as well? That might be easier.