I want to OC my Duron 1000,but CPU multiplier button is greyed out.Will it work if I connect L1 bridges on CPU? (I have GA-7ZXE mobo)

I think, usualy when it is greyed out it doesn't support that motherboard.

I have the same board and tried to unlock my athlon900 with no luck. The board does not change the multiplier. All you can do is crank the fsb or unlock your cpu and lower the multiplier via L bridges but i don't recommend , I thought i fried it, i was lucky.

You MUST connect the L1 bridges for the multiplier to work, the athlons/durons will just refuse to run at a different multiplier even if the mainboard forces them. Even so, not many mainboards support software multiplier change, so you may have to go back to the dip switches to change them.