Hi all my CPU fan is currently running at around 5625 rpm on average. Is there any way to increase this?

wow, is that not fast enough? I dont think they make them any faster then that, unless its a small 40mm fan, average speed of a stock 80mm cpu fan is 2000~2500rpms. If you want it to decrease the speed then see if your bios has "speedfan" which controls fan speed according to temp. abit is7 i856pe Prescott 2.8ghz @ 4004Mhz 286x14 FSB @ 1144Mhz 512x2 in dual config @ 430mhz 9800 se unlocked & clocked @ 444mhz/800mhz

Glue another fan the same size on top of it and it will increase the speed + air flow.

Notice on the double fan suggestion: 1)The fans will produce very high noise compared to only one fan 2)The airflow will be better, but the lifetime of your fan probably will decrease because it is made to live for XXXXX hours in the nominal speed. If more than this, more heat in the fan electric engine and more consuming of your fan life. It is really needed to adapt two fans or to speed-up the one of yours? Fans generally runs at 12V for full speed or 5V for silent mode. I don´t know how to get more than 12V from your PSU, and if it will kill the fan engine! Be carefull!

My experience with having a fan blowing on the heatsink fan shows a speed increase of about 500rpm on a 60mm fan and ~200rpm on an 80mm fan. This is using a Chill Vent duct with 80mm fan positioned about a half-inch to inch away from the hsf. In the case of the 60mm fan, I finally just removed the heatsink fan and used the Chill Vent w/ 80mm fan positioned about an inch away from the heatsink. In the case of a heatsink w/ 80mm fan, I used the Chill Vent with no fan inside. Information is available at; http://www.koolsolutions.net/ Read the faq section to find fan rpm change mentioned. Frankly, if you think increasing the speed of your fan will make a measurable difference in cpu temps, I believe you'll be disappointed. My bedroom machine is a 2400+ in a cheap case used for watching tv, dvd's, and folding 24/7. An inexpensive aluminum w/ copper core, 80mm 2600rpm fan, installed with the provided thermal pad keeps temps at a steady 51°C. It's a Cooler Master CP5-8JD1F I bought from svc.com for $6.30. The case has nearly nonexistant airflow...an 80mm fan in the front at +5vdc and the psu for exhaust. Skip