Some details on my build: The problem is the cheapo power supply had a very noisy fan, and that big perforated panel let all the sound out. So I opened up the powersupply and swapped it with a $10 SilenX fan from NewEgg. 11db rated. I used the silicone mounts instead of screws, and turned the fan to...

I got this case, and fitted it with the Zotac 9300 ITX mobo. I too felt the power supply hole was too big. I took a scrap of aluminum and nibbled out an adapter plate that let me put a miniATX power supply in it, which seems to be much more to scale. It looks ok, but this is the noisiest chassis eve...