I'm new to overclocking and gone tru guides and I got few questions/problems on my overclock and probably more to come.

What is the purpose of tightening ram's timing? Before raising the FSB, I loosen the timings by increasing the value, usually 5-5-5-12. Why is that so and why must we tighten it back later on.

Let's say i set the FSB:RAM ratio 1:1. I raise the FSB to 400. Is the ram's exact speed 200MHz and doubles it to 400Mhz(dual data rate) or does it has a speed of 400Mhz and runs at 800Mhz due to DDR?

Before raising the FSB must i lower the RAM's frequency to the lowest? Let's say if i didn't lower it and i'm using a PC6400 ram with 800Mhz with 400Mhz exact speed. With an E4400 with a stock FSB of 200Mhz i raise it to 365. Would my ram speed raise 165 to 565(1130)?

I have gone tru many guides but seldom there is any mention of overclocking the nb or the sb. Does raising the FSB affects the nb or sb?

A C2D E4400 has a multiplier of 10x while a C2D E6320 has a multiplier of 7x. Does that mean E4400 would have a higher OC?

Can someone explain to me why a 457(FSB) x 7(multiplier) = 3.2GHz performs better than a 320(FSB) x 10(multi) = 3.2Ghz?

Thank you.

Okay thanks guys understand about the FSB multiplier issue.

Must i lower the rams frequency to the lowest before i attempt to raise the FSB?

Can i control the frequency of the rams? Just an example. Default FSB 266 MHz, default ram speed 533Mhz. Let's say the ram can overclock to 1000MHz. At 1:1 ratio the ram would reach 1000Mhz with 500MHz FSB. Can i lower the default frequency of the rams so that when i increase the FSB to 500Mhz i would have a lower ram speed at below 1000Mhz so that i can further increase the FSB to above 500Mhz?

Hmm okay usiang Intel chipset, but should be okay with the 1:1 ratio for mild OC.

With a mild OC, i change the timing of the rams it makes no difference.

Can someone explain to me why must we tighten the timings? What is the disadvantage of loose timing? And if we overtighten it to a very very small value, what happens?

Thanks.