Will the performance of E7400 when overclocked to 2.93 GHz will be Equal to E7500?
Actually, because of the higher FSB frequency, it will be better. But you will need a very good benchmark program to tell.
And Upto What Speed I can Overclock E7400 and E7500 using the Stock Cooler without Decreasing the Span Life of the processor and without any Damage?
Upto What Temperature Can the Processor can be Overclocked So that it does not get damaged.
And For How much Time we can Over Clock the CPU @ Max.speed using Stock Cooler?
Please answer the above questions..I know that Using another Cooler can be better for Safe Overclocking , But i wanna Know , because i am on Serious Budget.
Speed is irrelevant. Speed doesn't kill CPU's. Voltage and temperature kill CPU's. Regardless of cooling, your voltage - temperature envelop is 1.3625 volts/70 C.