Question regarding fan wattage

Basically my GTX 560 ti runs a bit hot, so i'm looking to get a side panel fan.I can up the GPU fan RPM in MSI afterburner, but it sounds like my graphics card is about to take off into the air and create an air traffic hazard. It ramps up to around 3000 rpm when i'm playing EvE, which, while graphically impressive for an MMO, i could play that game on a 6 year old dual core with onboard video. I can up the GPU fan RPM in MSI afterburner, but it sounds like my graphics card is about to take off into the air and create an air traffic hazard.

 

The case itself has plenty of ventilation, it's an antec 900. 3 120mm fans, two in the front air intake, and one in the back is exhaust. Then there's a big molex powered 200 mm on the top for exhaust. Basically my fan controller has a maximum wattage of 10 watts per channel, with five channels. What would happen if i got,say, a 15 watt delta fan and threw it on there? Would my fan controller melt? Or is it a case of the manufacturer overestimating the needed wattage  and the manufacturer of the fan controller underestimating wattage output? I'm just curious so i can decide if i want to walk down to my local computer store and grab a fan from the fan bucket or if i want to dish out for a higher quality fan that can deliver higher rpm's if need be? Also, is it wrong for me to want to touch Logan's beard?

If you get a fan that needs 15 watts of power (especially around 120mm), you're going to have the same noise problem. I'm guessing the thermal grease just dried out, and the heatsink isn't make as good thermal contact to the GPU as it should be. Just re-apply thermal grease, and use some high stuff (Arctic silver 5 springs to mind, though there are others.)