So, before searching for the technical requirements for esx4i: do you know if it works on any modern computer with sata disks (starting from ich 7 or 9) ?
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Both the Zotac-230 and the Zotac-330 motherboards work well. You will have to do the usual NIC fixes in initramfs and upgrade to to the nVidia 180.51 and alsa 1.0.19 drivers etc. In fact all the Ion motherboards tested so far work excellently.
Look for Zotac ION-ITX-A & Zotac ION-ITX-B boards.