I only know these from several reviews, which pretty much say the same thing: jet 7 looks cool but has a mediocre heat sink and a really loud fan (43Db or something), the aero 7+ is much quieter by comparison but does less well cooling. If you are able to, I would recommend a Thermalright heatsink, either the SLK 800 or 900, and put your Smartfan on top of it (which is what I did). Set the fan to manual control if you push your overclock so you can boost the fan before heating things up.