Something similar to this http://www.newegg.com/Product/Product.aspx?Item=N82E168... (not this specific model per se it was just the first one on the list).
1. Are these things able to keep graphics cards cool? If yes how much of a difference should I expect to see?
2. What are the advantages of having one of these over a side panel fan, aside from the obvious one of your case not supporting side panel fans? What if I got one of these and a Side Panel intake fan would that bring temps down even more?
3. Are these intake or exhaust fans? If its an intake fan wouldn't I need a filter of some sort for it? If its an exhaust fan wouldn't it weaken the GPU's cooling because it takes away air from the GPU fan?
Those are normal temps.
Nothing to be concerned about.
Select a quiet fan setting you can live with when surfing and watching video,and bump it up before playing games.
I have my 5850 set at 27% when i'm not gaming,30-35% gaming.
My temps are excellent.
My case and fans set-up help out alot..