You don't "need" a case at all, it is perfectly plausible to run it without any at all, the only thing is that it leaves your components vulnerable to.... human error (stares at drink)
Hmm...
Okay, so as long as I do no physical damage to the components, it should be alright then? (Well, I think I'll just buy some nets to cover the thing)
I was more worried about dust particles and electricity safety issues using the racks...
You may run into difficulty when turning it on as you will have to fiddle with jumpers and a screwdriver, unless you rig up some sort of switch. I really wouldn't recommend not using some sort of case, especially if your investing quite abit of money into some nice kit, you might as well buy even a cheap case and leave the side off if you plan on hotswapping etc.
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