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I have an antec sonota... and i wanna cool the whole case down... i have a 120mm fan in back... should i ditch it for a more powerful fan? Should i cut a hole in the top and put a 80mm? I want a good way to cool my comp over all

 

From the Antec site -

Cooling: Up to 2 120mm Fans
- 1 rear (standard) 25mm thick
- 1 front (optional) 25mm thick

If you haven't already then I'd add an intake fan to the front of your case. It will make the airflow throught the case more effective and cool it nicely.

Any idea what your case temps are at the moment?

 

I'm certainly no expert but many modders do mount a top exhaust and side inlets as well. If you have the space the front inlet can be important. Here is a link for a blowhole:

http://www.gideontech.com/content/articles/180/1

 

Hmm... front intake-rear exhaust is important. If you have a gaming setup (nice, hot GPU's).... then a side hole with a 92mm or 120mm fan blowing air in over the gpu/cpu area is good. You don't NEED a fan in the top, but putting a grille-of-sorts in the top will let heat from the optical's/drives escape up top by convection.

 

Top exhaust is always nice. Simple test. If the top of your case is even slightly warmer than the sides, you need one !

 

That blowhole is nasty,it isnt round and the grill is off centre,I'd have to dump the case

 

Yes I'd have to agree it's not one you could let the kids near (slice their fingers off). I did see a lot better example (tutorial) but when needed do you think I could possibly find it again!?! At bare minimum although dodgy placement of grill it should have still lined the outline of the hole with rubber stripping to cover sharp edges.

 

my computer turnoff every 15-20 min.

 

???? You turn it off or does it turn off by itself???? If so on the restart goto BIOS and into PC Health and make a note of temp, RPMs' and volts. Later do the same after a cold boot (system has been off for an hour).