http://www.ebay.com/itm/5V-Cooler-Brushless-Micro-DC-Fan-25-10mm-Mini-Cooling-Computer-Laptop-Fan-Black-/252053118110
+
http://www.ebay.com/itm/Cable-de-recharge-USB-Plug-Power-Cord-pour-Nintendo-3DS-DSi-DSi-LL-XL-Noir-AH-/191798831111
=
GBP 0,99 + EUR 1,-

= able to run 325 MHz instead of 280 MHz, with very few HW-errors (less then 0,1%)