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Mounting a motherboard upside down?

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Pioneer:
Hi I'm building a desktop mame arcade with four player controls and s video, composite a/v outs. The plans I ordered have space for a spinner and trackball.  I don't want either since my preference is fighters and beat em-ups.  I wan't to know if I can use that space to mount my motherboard facing down and just secure the outward end of the agp card with rubberbands or fishing line. This would allow me to use a thin material, even a screen, as the bottom and just mount it halfway up the control panel box.  If you know any shortcomings to this design please let me know. 

BobA:
I would think that being attached to the top surface of a desktop control panel might cause things to vibrate more and tend to come loose.  More so if mounted upsidedown. Connectors and jumpers could fall off the pins as they are only held by contact friction. This might be overcome by a few dabs of hot glue.

Another problem is the heat sinks are meant to be mounted so the heat goes away from the component or CPU.  This mounting would tend to hold the heat.

TMS:
I wouldn't use a rubber-band either. Boba is also correct about the heat problem. Heat rises and you risk burning out your chip

Pioneer:
I just saw a unit that used this upside down style and it looks like a high end unit.
http://www.gamepc.com/labs/view_con...0A964D5108A07FA

TMS:
The link is not working, but I could see a setup where you have one fan on the heatsink sucking hot air down into a pipe and then another fan on the case sucking it out, but it doesn't make a lot of sense

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