Originally posted by: AstroGuardian
Your PSU is sucking air into the case? What's the point it it? Why did you do that?
Good eye. That computer is in my study in Concord, CA, which hits 100 F regularly in the summer. We have solar panels making us roughly energy neutral, yet we rarely use A/C. (This got quite a reaction in a different thread a few years back. You'd think I was implying others were un-American for turning on their A/C. No, just living my life, my way.)
Rather, we ride the nightly temperature swings, with strips of 80mm computer fans exhausting out most windows. I've built enough wooden fan strips to make our house look a bit odd, but we prefer them to box fans. (Hey, we're all modders here...) For instance, the windows remain secure, unlike a box fan sitting in an open window.
Even if one discounts the rated cfm of Newegg's
MASSCOOL FD08025S1M4 80mm Case Fan (10+, $1.29, free shipping), with enough of them we reach a tipping point where the air is changing many times each night. Then we ride out the heat of the day till it's time to open up the house again. My engineer wife calls this "sailing the house."
Anyhow, left unchecked my office can get 10 F hotter than the rest of the house. My plan is to vent the top of the computer out a dryer hose, out the window. (I've done this before with other computers.) With the fans on 5V this doesn't involve so much air, and with the Megahalems I can still manage a surprising overclock.
The Mountain Mods Pinnacle 18 case is easily adapted for this, with 3 front and 2 back 120mm fans blowing in, 3 top 120 fans blowup up and out, and the power supply fan reversed as you noticed.
In my past experiments, memory speed had a secondary effect on the parallel computations I use this machine for. Processor speed times number of cores is dominant. Getting the cpu cooler fresh air from the back helps for overclocking, even if it means exhausting warmer air onto my memory.