Reply 16500 of 40034, by Cyrix200+
- Rank
- Oldbie
Thanks Gamecollector, I just found this site with a nice explanation: http://www.10stripe.com/featured/form/atx.php. I quote it here, the site has a drawing also. The confusing bit is that the term 'mini-atx' has been used for different motherboard sizes. Anyway, since I like anything slightly weird, I'm happy I got this motherboard 😀
Introduced as part of the original ATX standard, Mini-ATX is slightly smaller but otherwise quite similar. Mini-ATX was never ve […]
Introduced as part of the original ATX standard, Mini-ATX is slightly smaller but otherwise quite similar. Mini-ATX was never very popular (so unpopular, in fact, that many people have forgotten it ever existed), and was deprecated in ATX 2.1.
The great trick of Mini-ATX was that 4 motherboards could be cut from a single PCB "blank", versus only two for ATX. The blanks are 24 inches by 18 inches; Mini-ATX was just slightly smaller than 11 inches by 9 inches (to provide some margin of error).
Mini-ATX trimmed off space at the "top" of the board (the end traditionally near the power supply) and on the edge farthest from the integrated I/O ports (the edge traditionally closest to the front of the case). As a result, it could still have a full complement of expansion slots.
Up through ATX 2.01, Intel described an industry transition to Mini-ATX as "inevitable". However, Mini-ATX required 5 mounting holes that ATX did not, and not all cases had these extra holes. This incompatibility, minor though it really was, proved to be a deal-breaker. The subsequent introduction of microATX effectively took over Mini-ATX's niche.
1982 to 2001








