Thanks Taisto.
i changed it sucessfully but the cpu temps is 10 degree C higher than compared to running windows ..why is that..? and will cpus=1 fix this issue ?

if i do that will my other core will also be used ?

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MAC OS x : Yet to figure out version.
CPU:AMD E-350D APU MOBO:GA-E350N RAM: 4GB 1333Mhz GPU: AMD Radeon HD 6310
HDD:Seagate 160GB SATA DVD-RW: Transcend USB Burner USB Mouse & Keyboard
WebCam: Logitech C910

Chipset:
AMD Radeon HD 6310
North Bridge: AMD A45 FCH