In an effort to reduce the VRM temps on my Neptunes, I will be upgrading my fans to these high airflow 120mm fans:

http://www.newegg.com/Product/Product.aspx?Item=N82E16835213001&cm_re=delta_120mm-_-35-213-001-_-Product

Also got 120mm to 140mm adapters:

http://www.newegg.com/Product/Product.aspx?Item=N82E16811995076&cm_re=140mm_fan_adaptor-_-11-995-076-_-Product

Will update with my results when I get the stuff.  Its being shipped via Neweggs poverty speed shipping though so it might be a while.