Do you need to change the Vcore to overclock?
i overclocked my XP2500+ up to 3200+(it shows up as 3200+) without changing Vcore and just changing the CPU External Freq. up to 200 from 100 and CPU Frequency Multiple to 11X which it was for default.
if i dont need to change V core to OC, thats great because if i change my Vcore sttings, my computer wont start up, unless i reset the BIOS by the junper on MoBo.
i'm guessing my PC wont start up if i raise my Vcore to 1.7 from 1.65 because of my mobo and/or power suply.
my mobo is ASUS A7N8X and Power Supply is 350W(dont know the company).
i'm asking similar kind of questions over and over, but please dont get pissed. :)
Thanks!

I think that's a good question to ask since adjusting vcore can be perilous and it best to do it only after you've gained some experience, and is often not even necessary as you've found.

Sounds like something is wrong with your mobo if it won't boot at 1.7v. I doubt its the power supply if you are stable at all loads at 1.65v. A max loaded 1.65v cpu takes more watts than just a booting 1.7v cpu.

i'll thank you(johnoh) so much for replying all of my questions, it really helps me out.
i was going to set Vcore up to 1.7v with all other setting set to default, but i decided before doing that, i want to know if raising Vcore makes any difference in good way or bad way? and does raising the Vcore setting produce more heat?

I always try the exact opposite. I go as high as I can with the default vcore 'cause raising it heats up the processor considerably. It is odd that your computer won't boot with a higher vcore. Typically raising the vcore enables booting at higher setting that could not be reached at stock. I could only guess as to what is causing your 1.7 vcore lockup, I would agree with above maybe mobo. Since its vcore its basically just processor voltage, but the processor runs at 3200+ so I wouldn't think its the processor. I would just keep it at 1.65 since it runs so well at that voltage. Why introduce more heat? dark.

i see. so if its working at 1.65 all right, i have no need to increase the voltage wich also increases the temp.
thanks dark :)

The opposite isn't better. The heat from the vcore increase might not allow you to boot it up at say 3.7ghz @1.75v but if you just increased the vcore to 1.70v it might of allowed you to do so since the heat isn't as bad.

The heat from the vcore alone can cause it to not boot. Even if it's not overclocked.

This is why it's better to increase the FSB first, then when it crashes increase the vcore just a bit.

ok. i think i got it. i guess i better stay with 2.2GHz(OCed). and its working great enough so. lol
thanks