Wow, you guys can afford a quadcore processor.
But why in the world you guys are using DS3.

If you guys can afford a quadcore, i think you guys wouldn't have trouble to buy expensive motherboards, no?

Multipler is there for intel to set to mark on their processor speed for the market according to the grade of the processors based on stable default speed at a certain voltage.

QX6700 and all the extreme processors are unique in that you are free to set the multiplier to that u desire.

Your problem is most likely that you are pushing your RAMs too hard, When you get a stable cpu speed at 1:1 you can adjust the ratio to 2:3 or 4:5 so that your RAMs would be at 1000MHz or so.. adjust the RAM timings (5/5/5/18..6/6/6/24.. 4/5/5/18 etc..5/6/6/20) and voltage accordingly(up to 2.2 would be ok)

If 280 fsb is all you can do the by all means increase the multiple to 11.. that would bring the cpu to 3.08GHz. I reach 370 by dropping my multipler to 9.. to get to 400 and beyond I may have to drop to 8 or 7, all the while keeping the cpu vcore within 10% the default voltage. There is also chipset/FSB/bus voltages to consider. Increase FSB speed would be better than multipler increase is because it increases bandwithwidth for more data feeding the 4 cores.

Trial and error(and a lot of time/testing).. no short cut .. could also be a limitation of the chipset.. (generally I dont increase voltage of any part more than 10%) ... that is why if you are impeded by fsb.. increase the multiplier. 3.0GHz at default voltage is no problem for My 2 quad cores.

1.35volts ..... most likely

So this thread has evolved to a quad core thread again... I started one 7 mnths ago... but was combined with the dual core conroes..

Quazacolt... try backing the fsb a little.. say 345MHz... to make sure it is not Ram speed issue try running one instance of orthos stressing the RAM... My cpu core 3(4th) is also a culprit that prevents me from going beyond 370.... Primming only the 1st 3 cores (1 hour or so).. i was able to go to 3.7/3.8GHz and ran some Pi test

Why is that happen? So when u disable core 2 and 4, is that mean ur system is not rock stable right?

hmmm... i always wondered how come dual core has lower clock...

my 4th core is stable at 3.4Ghz at 1.4/1.425v cpu voltage. beyond that will error no matter voltage applied. The other 3 can go to 3.7/3.8 or so. at 1.55v or so

wanna ask quad core user here. u guys are getting high score benchmarks. but wanna ask, did u feel any real world benefit? was asking coz may get a quad core year end.

I sure hope so, but is anybody running quad core on a PSU with 500w or less?

I think for longer life for PSU u need around 650W and above. Mine 560W also dont know when should I change again.

whoa bro...cool it there man... 120deg Celcius on all cores?
either your software is getting the wrong temperature or you screwed up the thermal diode already...

you should not reach 120'C bro... by that temperature, your CPU should have been dead/shut down already...

ok ok...

my idle temp usually around 59'C to 62'C depending on my room temperature...

so it's about right if compare your chillin and my chillin' temp...hehehe...

yup... super stable...not a single issue after about 3 months of using...

put it this way, i think you won't find any normal application that will push all 4 cores to 100% all the time....so actually your CPU won't heat up that much at normal application use....

that's my take la... maybe i'm not using any CPU intensive application...

I'm new about overclocking.
this is my humble 1 month old pc....
specs are below

Intel Core 2 Extreme QX6700(beta unit)
1024MB Micron 667MHZ DDR2 RAM
MSI nForce650SLI P6NSLI mobo
Leadtek GeForce 8600GT
PSU:PowerLogic 250W
Liteon DVDRW
Maxtor 150GB SATA2 HDD
cooling:Coolermaster processor slot cooling only

hope some comment and any tips on oc it...hehe..