InvalidError :
Crashman :
Joe's comments concern the availability of similar features in Micro ATX models. He assumes that you won't need five x1 slots and that 2 would do. He's probably right.
Personally, the only add-in board I have put in my last two PCs is a GPU and even that might go away once CPUs get HMB/HMC and IGPs that leverage it. I wish there were more decent and reasonably priced mATX cases, full-ATX seems like such a waste of space for a regular single-GPU desktop system.
This, for the most part, although I've put in an occasional wireless card. I consider USB dongle antennas as tending toward useless, so if wireless is a need, I'm going to want a card.
One possible exception is drive space limitation in small cases. Most meet the minimum for general use, which IMHO is a system SSD, a data HDD, and an optical drive (why I consistently grouse about only two SATA cables included with motherboards). A fully loaded primary system will have a system SSD, a pair of HDDs in RAID1 for data, another HDD for backups, plus the optical. That may require an ATX tower.