Here again you have to ask GATEWAY directly if your computer is ATX or micro ATX form factor or NOT! Did whomever you purchased it from 'represent' to you that it was ATX ? You purchased a fully assembled computer, not specific components, so you have to go to GATEWAY and get component specs from them over and above what they have already provided.ĮDIT: Regarding ATX specification, the CNet Spec listing where it says 'Form Factor' simply says the word 'Tower' nowhere else on either spec sheet did I see the letters 'ATX'. In your case GATEWAY is the manufacturer, and their suppliers provide components based on SPECS Gateway requires or suggests based on feedback from the various manufacturers concerned. When you buy parts separately and assemble or 'build' your computer like most forum members do, then every component purchased for the computer has a full set of specs available from the component manufacturer. Here is a review and specification by CNet on your computer, and, it has more information than does the Gateway specs: They are just not forthcoming with their information. Here is a link to GATEWAY for specs on the computer: The Gateway specs are useful up to a point, but if you really want to know the details, you should make a list and ask GATEWAY directly. Here is a link to Intel for the specs on your cpu: Looking at the spec on the hard drive, it looks like SATA with 3Gb/s base on the terminology. You have purchased a 'Budget System' with a 300 watt power supply. If you plan to up date the motherboard, you should ask Gateway about that. Since Acer supplied GATEWAY with the mobo, the part # on the mobo may be a special part # for Gateway, meaning you will have to call Gateway. Here is the only address I could find for Acer in the USA: Acer America Corporation 2641 Orchard Parkway San Jose, CA 95134, USA Ph: 1-40 Fx: 1-40. Based on the case dimensions, it would seem your motherboard is a Micro ATX, but actually, there are more specs than just ATX or Micro ATX, so you will have to ask GATEWAY to be sure

Dx4860 motherboard specs