I always leave my case side off(since it crappy and does not have a glass side or fan on it) to improve air flow-no problem here.
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AMD AtholonXP 2600+
512mb DDR333 Kingston
Soyo Dragon Lite mobo(KT400)
ATI 9600XT @ 571.5/357.5
80GB WD 7200rpm 8mbcache
19-inch ViewSonic PS790 CRT
DVD-ROM