yeah having 2 would be better, blowing over the MOBO/RAM is a great idea, and over the graphics card expansion slots and CPU is another great idea, also do you have a top exhaust fan? you could do with one if you dont have one to help suck the hot air out that is cool>blown over motherboard and RAM>heated up>that then rises to top of case
just helps to remove that hot air that could end up floating around you computer…
lol well thats why we are here (and i might know a thing or two about air cooling, i got me a kick ass case and coolers! heh) anything else dont hesitate to ask walks off for dinner