I hope someone can offer some advice on fan placement for a new system I've just completed for a family member. The system is based on an E6400 (stock hsf) cpu oc'ed to 3ghz, at the moment the temps seem fine (as far as I know anyway) idling at 35 c and going up to about 60 c underload (prime95 torture test on each core for an hour).
I don't know much about oc'ing or fan placement, this is my second oc and I don't fully understand what I've done (I usually don't oc but it's so easy with e6400), I've never until now played about with fan placement.
I've included here a diagram of the case and the present layout of the fans, I'm not sure if the fan on the back should be turned around to make it an exhaust? It came on the case like that so I thought they probably know whats best and it's good to have it like this blowing air near the cpu. I'm also not sure what I should be doing with the big fan, is this a decent place for it? Should I keep it as blowing air in to the case? I guess I could get it near the front somehow to promote front to back airflow but the problem is that this case doesn't really allow for that because the front is all sealed with no vents or mesh, I could open the door and take a couple of the expansion bay panels off but that would mean the door would have to be kept open, which I don't want to do.
I also have another small fan which could connect to the one and only chasis fan header on my mboard (gigabyte 965 ds3) which is currently unoccupied. Didn't include it yet as I wasn't sure about a good place to put it, might disrupt airflow if put in the wrong place and also there is no convenient place and way to attach it to the remaining spaces in the case, if I do attach it I'd have to do some taping I think.
Last thing (I know I'm asking for a lot here, just hoping to find someone with an interest and knowledge in fans) one of the fans is pretty loud, aswell as it's normal sound it emits a kind of tinny higher pitched vibratory sound, if it was at a slower rate it would sound like a rattle I guess. I've tried to fasten the screws as best I can, makes no difference. Any tips on getting rid of this kind of noise from the fans?
Thanks for reading, hope it wasn't too long.