Originally posted by: mechBgon
In practical terms, the answer would probably be that 120mm x 38mm Delta that AWhackWhiteBoy linked to, and Sidewinder Computers is a good outfit too. Be aware that it is going to be very loud. You might be able to hear your computer from outside your house. 😉 Also (duh) you will need to measure whether it'll fit, and mod your case to install it.
Also, people generally don't get a lot of results with high-output intake fans, it's the exhaust fans that really do the majority of the work. If I wanted to boost the cooling capacity of my Antec, I would start by removing the grillework over the rear exhaust fans, and move up to some Enermax manually-adjustable 80mm fans for the rear positions, so I can dial up the noise/airflow ratio I want. Hope that helps some 🙂