buy another GTX 480 and SLI them together. That will boost your fps considerably
this made me laugh. thats like saying buy another hard drive and your storage space will increase
and since that case you have already has 4 fans, I think cooling will be fine
lol. WHAT...
well in my experience oc'ing not every part is the same. when you change volts, xpliers, core clocks ect. temps go up.
sometimes you have to change more than one piece of hardware for an oc to work tooo. that is why you stress test before
you start playing around with it. as for your 6870 catalyst has its own oc tool with a test custom clock button to make sure
it won't crash before you jump ingame. your 955 is an easy oc to. change xplier to 18 and you get an easy 3.6 per core oc
and will still b be able to use your stock cooler. by doing some basic reading and
ALOT of trial and error
overclocking is alot of fun. this last pc took me a day and half to oc properly and 36 hours of stress testing.
now stock is fine but me personally i do not build a PC to run at stock (just like if i bought a suv i would notrun it at stock
because of the potiental it has ie bigger wider tires so i can climb the dunes). there are some manufacturers that factory oc and
sell hardware for more when all they did was set a couple settings from factory send it on its way. most hardware has wigggle
room for what it can be set at to get improvements. ie like the
amd 955. you can pay less but get the speed as if you bought
the 965 by oci'ing it.
edit: 480 cards have a max temp of 105c. and can run under load at 90c with no issues
also how do you know if your temp did not go up on your gpu if it crashed? amd cards (only kind i own)run
at half their gpu clock settings when not in use and if your not using afterburner clcik auto tune in catalyst
to get your oc that won't crash.