overclocked my e8400 with stock voltages and excetera( a bit affraid of what to do when i will need to), and noticed my fsb is almost 1500....

That FSB is fine. If you go much higher you may run into stability problems and will need to increase the voltage a little.

It depends on your motherboard chipset, x38/48 runs at 1600mhz fsb natively, while 680i fries itself...

I don't think the 680i fries itself, doesn't it just wipe your harddrives?

im currently using a DFI DK X38 T2RB.

So, when it starts getting unstable, how do i know which voltages to turn up?

I had my E6300 running at over 2100FSB on a P35 chipset. 1500 shouldn't be a problem.

2100fsb? What was the voltage?

i think if you want high fsb then you should just max the NB and FSB voltage and keep pushing the FSB with the 6x multiplier untill you cant get any higher.so you should get 533x6 no problem. thats 2132FSB!!!but make sure you have some 1066 ram though!

wouldnt that be utter hell on the components though with max voltage?

You'll probably be limited by your RAM. When smoke starts coming you, you know you went too far ^_^

Voltage was a meager 1.27 and I was using Buffalo Firestix PC6400 @ 2.1 volts. Ran it that way for over a year, no issues. I didn't have to touch FSB or NB. Just CPU and Ram.

I'm surprised you didn't run into any stability problems. Pretty low voltage for a very high fsb.

I give all the credit for its stability to Gigabyte. Great motherboards.

I have been running 1600mhz on my Gigabyte DS3 P965 Rev.1 for 2 years now with default NB and FSB voltage. It sais that it only supports 1066mhz too.

D:! does that mean the 750i will wipe my HDD"s if i clock my Q6600 at 1600 with a 7.5x multi (assuming mobo and cpu can do .5x multipliers )??????? now im scared to buy one lol!

Yes. It will, if you can get it stable long enough to reach that point