The case does make a HUGE difference, I had a friends whose computer crashed programs under load, because of CPU overheat. I did some custom fab on a bracket that went under the PSU and bolted to the rail below the PSU. I then attached a fan to it and made a 80mm wide slant piece that would bolt to the fan and direct the airflow between the mobo and the mobo tray and blow on the rear circuits and crap near the CPU. Hey, it worked decent, he could stay 5min. longer in BF2142, LOL. Finally had to spend $50 on a new CPU cooler and some Arctic Silver.