graphic card and motherboard are overheating

Nah, automatic fan control is unnecessary, it needs to be off. It's in your BIOS you need to check.

 

thats swithced off only.there are two more options realting to the fan control.so what should i do about them.for now i have put one at slow which is related to heat sink i think and the other is at high.so is this fine.

 

It's not really your CPU cooler that's the issue, I think it's your case ventilation... Set them all high, if still no luck, buy some new case fans...

 

okay thanks a lot man.one more thing,how can i increase the rpm of the fan.or its just automatic because i got the cheap fans installed in my comp that are connected through the power supply.my bro was saying that the fans that connect on the mother board are the high end fans.

 

If they're hooked to the power supply they're already at maximum speed. What size case fans does your case use? I can probably recommend replacement(s).

 

one 120mm and two 60mm...well the places where it can be hooked are only fixed with these fans.there is no more place to fix the fan since there were only 3 vent holes.xcept for attaching one more to the heat sink fan which can hold a 120mm fan.the rest there is no place.

 

Then it's time to buy faster ones. Try replacing the 120mm fan with something like this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811999344
These things can go as fast or slow as you like using the fan controller that comes with them. At full speed they make a lot of noise, but they push incredible volumes of air.