I bought a Fan Mate from quietpc.com and it works fine. It was only £8 +vat so seemed cheap enough, except it's one that sits inside the pc and can only be altered by taking the case off. I did think of modding it and adding a knob, but then found this: http://www.ebuyer.com/customer/prod...2hvd19wcm9kdWN0X292ZXJ2aWV3&product_uid=43374 I needed a new HS & fan for an old 1.2 gig Athlon that runs hot, but the price of this is less than the cost of a Fan Mate, and is adjustable via the pci slot. I've ordered two, and will see how the other one fairs using just the fan speed controller on my other PC. Could be a cheaper alternative, unless someone knows something more suitable? Gary.