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Limited by CPU's overclocking ability ?

post #1 of 10
Thread Starter 
I think my CPU won't go past 430MHz @ multiplier 8.0

First I tested my mobo and RAM capability:
CPU: Vcore: 1.20 ; Multiplier: 6.0
RAM: VDimm: 2.00 ; Timings: 6-6-6-24 (I relaxed the timings on purpose)

I set my FSB at 450 (CPU clock 6 x 450 MHz = 2.7 GHz) and ran ORTHO. Everything went smoothly for more than 30 minutes. I haven't tried going past FSB 450 but I think the mobo can do better.

Then I set my CPU multiplier to 8.0 and started raising the FSB all the way from 333 till 430.
I had to set VCore at 1.3625 to make the CPU become stable at FSB 430.
However I wasn't able to go past FSB 430 as I don't want to go over VCore 1.3625.

Can it be that my CPU won't do more than that since RAM and mobo worked perfectly fine at FSB 450 ?
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post #2 of 10
I think it's your RAM that is limiting your overclock. According to the DDR2 RAM List, Kingston uses ICs that don't overclock very well on those sticks. Can you set the RAM any lower than 1:1? I would try that in addition to relaxing your timings.
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post #3 of 10
Unless I'm mistaken, the RAM would have been overclocked at 450 fsb with the x6 multiplier (I could be wrong here). What are the temperatures like at 430x8?
    
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post #4 of 10
Thread Starter 
Quote:
Originally Posted by bstew View Post
Unless I'm mistaken, the RAM would have been overclocked at 450 fsb with the x6 multiplier (I could be wrong here). What are the temperatures like at 430x8?
Exactly, the RAM was indeed overclocked and that's why I dropped the multiplier... to test how far my RAM and mobo would go.

I don't think I can set RAM lower than 1:1.
Even when I change the Strap frequency (which gives you different FSB:RAM ratios) the lowest I can go for RAM is 1:1.

When I reached FSB 430, max temps were at 50-52C.
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post #5 of 10
Hmm I'm not really sure here. You're temps shouldn't increase enough from 430 to 450 to really hurt anything. You may just be hitting a wall here (hopefully somebody else knows why).
    
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post #6 of 10
i have found this sort of thing happening with my q6700 ,
your mobo will go higher , but your limiting factor is your processor ,

me and a few other q66 & 67 owners have found that as soon as the processor hits a certain GHz be it on a x8 , x9 or x10 you need to up the voltage ( quite a lot to get to the next step

my Q6700 would go to 360mhz at 1.39vcore but to get to 370mhz takes 1.45vcore
and I am not alone in this I would think you would be ok to try 445mhz and bump your vcore to 1.39-1.40(in your bios ) it will be a bit lower actual under load depending on your droop

hope that helps
    
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post #7 of 10
Id have to cast my vote towards the the cpu limitation..

My q66 wont stablize past 3.40, Ive tried the unlinked ratio with ram running at 800 and still no go.. even pushed bios vcore to 1.55 which gave me 1.5 in windows but still no go...

Some cpu's just dont OC as well as others
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by killbot View Post
I would think you would be ok to try 445mhz and bump your vcore to 1.39-1.40(in your bios ) it will be a bit lower actual under load depending on your droop
Isn't max vcore for 45nm chips rated at 1.3625V ?
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post #9 of 10
CPU Core Voltage and CPU VTT Voltage above 1.3625 have been known killers of the 45nm chips... however this is still in debate as many say its the CPU VTT that is killing it not the vcore..

either way what Killbot is saying is the vcore set in bios is not always the vcore its running at (Vdrop/vdroop) so what does cpu-z show your voltage at? if you set bios to 1.3625 its probably about 1.34 in windows idle
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post #10 of 10
Even if you overclock it to 3.6Ghz, you would need a better cooler for it to be stable without frying.
    
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