Do as I do, or try.One day whilst rooting through my old computer parts, I found the fan unit out of an old defunct PSU, so I grabbed it and opened up my case. Since my case was a new ATX one it had loads of room to stick things, and some hidey holes as well-
On the metal plate behind the front panel on my case, there was a removable plastic device that is used for holding full length expansion cards in place, upon removing this, I noticed there was a big hole cut into the sheet metal behind it, yes, it was another fan mount. I screwed the fan in place over the hole so it sucked air into the case from the bottom (lower air being cooler) and replaced the plastic unit (perfect fit too). I then connected the power wire from the fan to the extra fan power connector on my mobo (if you dont have an extra, splice into a spare FDD power cable).
The airflow coming into the case from the bottom cooled everything nicely, and when the warm air rose to the top, it got sucked out by the fan in my PSU unit, handy, inexpensive, took 5 minutes to do.
Of course, if you dont have that fan mounting slot, it aint gonna work for you, I'm just suggesting it since most ATX cases I've seen have that exact same slot behind the plastic full-length card retainer, and a 120mm fan sits perfectly behind it.
As for other ways to do it, you could get out the drill and drill holes through your case cover on both sides and mount fans on the inner side of it (if your case is an easy access one with a 1cm slide lock to hold the sides on, if its a solid one-piece case cover this wont work) and then put more fans on the other side of the case to suck out or blow in the air (depending on what the first side of fans is doing).
Or if you want to go the whole hog, you could mount a Liquid Nitro cooling system around the main heatsources, you can make the system yourself, but getting the Liquid Nitro may be hard, unless like me, you live round the corner from a factory that has a 10,000 gallon tank of it mounted to the side of the building that is easily accessed.
That last method may be a bit OTT though
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When darkness calls and the pain and suffering begin again, you can guarantee that I shall be the instigator.
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Kevin "Kayy" Beadle, The Proprietor and Innovator of Kayyos-Vx WebDesigns.