After reading up on overclocking online I took the plunge and decided to try it out for the first time with my new(ish) system:
CPU: Intel Core 2 Quad Q9550
MB: Gigabyte GA-X48T-DQ6
RAM: OCZ PC3-14400 DDR3 8-8-8-24 2x2GB
PSU: Zalman ZM-850HP 850W
CPU Cooler: Zalman CNPS9700LED
VGA: ATi Radeon 4870X2
HDD: Samsung Spinpoint F1 1TB
OS: Vista 64
So I disabled all the power saving options, set the PCI-E Frequency to 100MHz and set the memory to 8-8-8-24, the idea being that I can tighten the timings later on once i get the FSB where I want it.
So far I have managed to get the FSB to 400 on stock voltage giving me a rated speed of 3.4GHz, this seems pretty stable, I only gave it 7 hours on prime95 so maybe I'll leave it overnight to be sure but it seems pretty good so far.
Here is a screenie of my temps idle:
and under load with prime95
These are the temps with the Zalman cooler on silent mode so I can turn it up if required but it only seems to knock a few degrees off.
So I decided to push it a little further increasing the FSB to 412 but this took upwards of 1.3 volts by which time the temps were getting too high for my liking, and perhaps I'm being a bit conservative but i dont wanna increase the voltage much above 1.3 but I dont want to kill the lifespan of the chip.
So I'm looking for some tips on how to bring the temps down and the FSB up. There seems to be a large temperature difference between cores, I'm not sure what to make of it, Core 0 is always the hottest. I removed the heatsink, reapplied a thinner layer of thermal paste (Noctua NT-H1) but it didnt make any difference to the temps.
Any tips from overclockers more experienced than myself would be gratefully recieved
well as long as temp are 65C or under. but your OC and situation seems fine. do you have a good airflow inside your case?
October 4, 2008 5:20:35 PM
its possible you've hit a FSB wall on your mobo or you got a q9550 that is a lemon
I have a q9550 at 3.85 ghz with 1.26 volts so 1.3 + volts is a bit much
I can probably push it higher... but i'm only on air so it would really over heat
at a certain point its impossible to push a cpu any farther because either the chip would require too much voltage, or the mobo isn't stable at higher FSB's at such a low FSB i'd suspect you either got a lemon MB or CPU
I can definitely push it higher on water
My core temperature spread is on average 12 C
core 0 is about 8 C hotter than the second hottest core