Originally posted by: dunkster
I suggest that instead of focusing on multiple case fans to achieve adequate case-ventilation, you should focus on 'which case will provide adequate case-ventilation for my system with an X1900XT, using only a single 120mm rear case vent fan?'.
Re-visit reviews of your candidate cases, scrutinize rear, front and internal case photos. Pay attention to restrictive grills, restrictive front panel openings and restrictive filters.
Forget any case that 'features' smaller case vent fans. Forget side-vent, side-ducts and rear vent holes - they tend to create in-the-side-and-out-the-back air paths that result in high drive temperatures.
Consider that some very simple mods such as snipping out restrictive grills, using low-restriction air filter media and taping off side vent holes can greatly increase ventilation, and result in quieter operation to boot. Multiple fans are multiple noise sources.
No criticism intended - just my suggestions. Hope this helps!