Too far one way or the other and the system became unstable. At my highest stable over-clock(3.6GHz) if I change the Cpu voltage in either direction the Cpu starts to chug and eventually crashes =/ Keep gtl ref and skew in mind while trying to achieve your maximum over-clock.įrom experience on my current motherboard random lock ups have occurred due to:Ĭpu voltage ping either up or down due to load line calibration being enabled.Ĭpu voltage set to low/high. A quick google search found this and this post explaining what exactly is skew. I don't have any experience with the cpu/nb clock skew since I don't have that option in my bios, but I've read in other posts that those settings also affect the stability of the system allowing for either higher clocks or lower cpu voltages. I would change the reference in one direction till the system was obviously unstable, then start changing the reference voltage in the opposite direction till the system was again obviously unstable, then finally pick a voltage in between which I thought should allow for maximum stability. I think I only have one reference voltage in my bios, but whatever its for it really affected stability. I don't know how load line calibration is on other motherboards, but for me load line calibration helped to get an easy early over-clock but sucked for getting those last few hundred MHz out of my cpu. Take your time, report back when you have tried all of that, if it does not work at least we have narrowed down our options. Put your CPU and NB Gtl ref's to "auto" also.Īlso try enabling your transaction booster if any of the above does not work. To start with, once you have lowered your memory speed, lower your V core to 1.4V and try all the other voltages on "auto", if that does not work then try these, some of your problems may be related to too high voltages causing NB/SB overheats.ĭram voltage 2.2v (because you have slowed the memory down) I had a Q9650 that I managed to get to 4.5gig stable but that was on the P45 chipset which is ideally suited for this chip.
To keep things simple and to start with, at those settings, what speed is your RAM running at? for the sake of the overclock ensure you manually set a lower divider to give you a slower ram speed to factor that out of the equation, once you have acheived the overclock then you can increase and tweak the ram. The P35 chipset isnt notorious at overclocking E0 stepping Yorkfields sadly but you may still be able to acheive your goal, the overclock is more about your motherboard than the CPU however which is why settings vary so much for chipset to chipset. Ocz water block, idle temp 35-38 degrees. Intel core q9650 retail stepping A revision E0 vid 1.25 Ocz reaper heatpipe pc2 6400 (ocz2rpr800c42g) memory 2x4gb sticks P5k (Revision 2) premium black pearl p35 chipset motherboard.
Please could anyone here give any guidelines as to how to get a stable 4ghz overclock with the following q9650 and P5k (p35 chipset) if this is posible? I think the settings are correct for such an overclock, but the pc tends to lock.Īre there any settings below that people can suggest are to high or need to be lowered to get a stable 4gz Oc with the settings below?