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Mounting the computer in the cabinet -- case or no case?
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Kremmit:
Lots of ideas for dirt cheap mounting in here:
http://www.arcadecontrols.org/yabbse/index.php?board=1;action=display;threadid=21159;start=msg171167#msg171167

If you've got PCI cards you're worried about, you might try stealing the slide-out Motherboard tray from a PC case- lots of these have the card retainer attached.  Or, cut up a case to use just the tray and card retainer.  Then mount the tray directly to the wall.

Power supply- I'd mount it to the floor, with the fan side right up against the back wall.  Cut out a hole for the fan, so it can exhaust it's hot air OUTSIDE the cab.  Or if it doesn't fit there, run some ducting to a vent hole wherever you can.
MnMCaputo:
sofakng, computer cases have come a long way in design, ie: allowing 120mm intake fan on the front, 2 80mm fans in the back, potentially 1 or 2 fans on the side, as well as the ideal, blow hole which sits on top right between the cdrom and the powersupply.  I used an IR temp gun, and actually found my case temp and cpu temp was actually 4degrees C cooler in the case then out of the case.  This is my case:
http://www.newegg.com/app/viewproductdesc.asp?description=11-182-507&DEPA=0
then i added this on the side right above the cpu heatsink:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=51064&item=3486418991&rd=1&ssPageName=WD1V
sofakng:
Well, I'm actually not too worried about heating issues.  I'm just curious as to the look of the cabinet -- whether having an open-computer (eg. motherboard just mounted by itself on the wall) looks cooler than having a computer case sitting on the bottom of the cabinet.
whammoed:
See the picture i posted previously for securing the pci cards...just bend some aluminum flat bar into shape with a hammer and vise and drill some holes.  To mount the ps use some L brackets or make your own out of aluminum angle.
sofakng:
A bunch of great suggestions, thank you.

L-brackets for the power supply sound like a great idea.  As for the PCI cards I'll have to fool around with this a bit...

I might order PCB mounting feet from Bob Robert's... If I remember correctly, he quoted me something like $8 for a set, shipped.  Shipping was $6 though (3x the price of the actual part... ouch).

What about looks?  (case vs no case) -- What do you guys vote for?
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