Is it possible?

[crisp82]

i posted b4 about overclocking my p2 350mhz. With the replies seeming a little then encouraging i was forced to think hard, and then it hit me how stupid i am. The clock lock wasn't implemented properly, so with an fsb @66mhz the cpu accepts higher multipliers, allowing for greater speed then 350mhz. So, if I use 'Tom's B21 pin trick' (covering pin b21 so that it stops the cpu from setting an fsb), in theory, i should be able to set a higher clock multiplier right?

or am I wrong?

and would it be worth dropping the fsb for extra cpu speed?

 

[AndyHui]

I'm a little confused.

You said last time, that you could apply multipliers greater than 3.5x to your processor.

If you set the FSB at 66MHz, did the speed stay at 233MHz for 4.0x, 5.0x and greater?

 

[crisp82]

Before, I set the Fsb to 66mhz, and the multiplier to 5, but the CPU defaulted to 233mhz. But, if I cover the pin which the cpu uses to set the p2 locking system will set itself to 'low', and allow for recognition of higher multipliers. i think.

http://www.anandtech.com/showdoc.html?i=205 has the following to say:

'The BH6's SoftMenuTM II setup includes one more feature that has been absent on all previous Pentium II BX motherboards, the ability to set the 'SEL100/66# Signal' manually. Before you hop out of your seat wondering exactly what the hell the SEL100/66# Signal does, let's take a look back at the introduction of the Pentium II 350/400. One of the biggest disappointments with those two processors was their partial clock locked nature, when using the 100MHz FSB the Pentium II 350 would only recognize 3.5x clock multipliers and the Pentium II 400 would only recognize 4.0x clock multipliers. This is caused because the SEL100/66# Signal present on those two chips is set to "High". Now, when operating either of the chips at a FSB other than 100MHz (i.e. 66MHz or 112MHz for that matter) the SEL100/66# Signal is set to "Low," effectively unlocking the chip and allowing it to recognize clock multipliers in the 3.5x - 5.0x range. So in theory, if one could set the SEL100/66# Signal to "Low" while operating at the 100MHz FSB you could clock the chips at 450MHz (4.5 x 100) without any problems other than those directly related to overclocking.'

Am i right in thinking that if i cover the b21 pin, which controls the 'SEL100/66#', then i could set to 66 and set a mulitplier of say, 7, or 7.5?

 

[crisp82]

Nevermind,
I tried covering the pin, but it just defaults to 233mhz. Damn Intel, those clever dogs!

Thanks anywho