We can always cram a full size atx PSU inside if the MB/GPU leaves enough space. Depending on the power needed we can even run one or two mini-itx PSUs (very small) and use external power bricks. I would love to get someone to dissasemble a passive Seasonic (or other hi efficiency PSU) and mount it ...

That's good to know. My current case had the PSU block removed, cleaned and fixed again to the case and I've been using it as an audio workstation. The PSU never stressed and leaky capacitors can be changed ;) If the worst happens, I'll get a small PSU like those that are used in Dell's business PCs...

Thanks for the information, both to NeoGeo and to tnnuser. I have a 500AF here that I'll be upgrading to a 1155. I was thinking about using the 1155 asrock motherboards that have the C.C.O. (Combo Cooler Option) that allow for 775 coolers, but I didn't know about the ZM-CS5B. This will allow me to u...