so i decided to do some research about overclocking and found out there are two tools which allow you to set the fsb on your main board even if your bios doesn't allow to do so , they were cpucool and setfsb , setfsb didnt really seem to work for me but cpucool did the job perfectly , all i had to do was find my clock generator id (pll) and select it within the software , i was able to raise the bus clock of my motherboard from 266mhz to 340mhz which finally solved my problem although i am still unsure what could have caused the board to lock onto a much lower fsb than it can actually sustain.[IMAGE]    
I own an Optiplex 780 which is running my processor at much lower clock speed than it should be , hence resulting in a good amount of performance loss , i did some research and found out that the problem could be linked with Intel SpeedStep but disabling it didn't help , my power plan is set to highest performance as well , the processor doesn't seem to throttle as it seems to stay at around 60C under full load. as you can see in the cpu-z screenshot given below , the rated fsb should be 1333mhz and the bus speed should be 333mhz which is not the case here , the bios also shows the processor bus speed at 1.333ghz [IMAGE]  
Optiplex 780 operating at much lower FSB/Bus Speed