Overclocking problem

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dylan123

New Member
Hi i have a Q6600 quad core 2.4mhz and i have been trying to overclock it but i keep having problems with it. I can get it up to 2.6mhz but whenever i try and do 2.8 or higher and run prime95 i get an error pretty fast saying "result rounded to .5, expecting <.4". It then also had bsod when i tried again. Any ideas on what this could be?

I have 4gig of ddr2 800mhz Transcend ram, could that be the problem?
 
Let the FSB as you wanted 2.8GHz and set the CPU multi to 6 or 7. Like that, you'll be sure that if your system is still unstable, it's not the CPU which is responsible.
Do this and tell us if your system is still unstable.
 
Hi i put it down to 7 from 8 what it was on and during testing in prime95 it lasted longer then it normally would (like 30sec this time) before it failed.
 
Try to raise a bit the northbridge voltage (+0.15v) if its temps are goods.
If it stay unstable, we can be sure that the problem is the RAM.
 
Hey i noticed that my CPU multi thingy was at 8 and i had an option to put it to 9 (which is the highest). I did that and so far its been running at 3mhz and on prime95 had no problems when i left it on for 20min. I hope that should fix all the problems now and it should be good like that. Thanks for your help

I have noticed since i put it up to 9 that my pc ideles at about 33 degrees instead of 28-30.
 
you're welcome :)
Your temps are very good. you are lucky. My E8400 warmed at 70° in load with stock settings and the intel heatsink. (my case is very well ventilated). I've had to buy a watercooling for my overclock. Now it stay under 60° in load with a 1.425v Vcore (4GHz 24/7). A very strange CPU ^^
 
As I understand it, the signals get weaker and can result in incorrect calculations (rounding errors for instance). To make the signal stronger you can increase the vcore (CPU core voltage). The maximum safe voltage for a Q6600 is 1.5V. When raising the vcore, you should raise it by the smallest amount possible at a time. Raise it by one increment, boot up and test stability. If it fails the test, increase the vcore again by one increment. Raising the vcore does increase production of heat, so remember to check the temperature. Around 60°C you start approaching the temperature at which throttling kicks in.
 
mrjack said:
As I understand it, the signals get weaker and can result in incorrect calculations (rounding errors for instance). To make the signal stronger you can increase the vcore (CPU core voltage). The maximum safe voltage for a Q6600 is 1.5V. When raising the vcore, you should raise it by the smallest amount possible at a time. Raise it by one increment, boot up and test stability. If it fails the test, increase the vcore again by one increment. Raising the vcore does increase production of heat, so remember to check the temperature. Around 60°C you start approaching the temperature at which throttling kicks in.
Click to expand...

The CPU isn't the only component which can make the PC unstable.
As Dylan's situation, the problem was the ram which was unstable when raising the FSB.
 
It seems that 3mhz is as high as i can get atm without it going unstable. Would increasing the voltage of the CPU help this at all? currently it is at 1.25volts, if it could would i increase it to say something like 1.3volts? I am aiming to get my cpu at 3.2mhz if i can.

Or could this just be the problem with the ram? I hope it is not since i only got the ram a few weeks ago ( was going to get 4gig of kingston 1066 but the guy at the computer shop talked me out of it saying i would not need it/ notice the difference:mad:)
 
PC2 8500 (1066MHz) ain't useless when overclocking... it's a pity. What kind of RAM do you have?

You can increase the Vcore up to 1.4v if you temps let you do so. Under 1.4v, it won't damage the CPU for a 24/7 use. (maybe it will reduce his lifetime from 50 to 40years...)
I thing you'll get 3.2GHz easily. Your temps are very good you'll have no problem increasing the Vcore.
 
i have 2x2gig Transcend 800mhz ram.

I will try putting it up to 1.4V and see if i can get to 3.2mhz. I have a friend with the same processer who has manged it but he did not have the odd problems i did when i was overclocking
 
dylan123 said:
It seems that 3mhz is as high as i can get atm without it going unstable. Would increasing the voltage of the CPU help this at all? currently it is at 1.25volts, if it could would i increase it to say something like 1.3volts? I am aiming to get my cpu at 3.2mhz if i can.

Or could this just be the problem with the ram? I hope it is not since i only got the ram a few weeks ago ( was going to get 4gig of kingston 1066 but the guy at the computer shop talked me out of it saying i would not need it/ notice the difference:mad:)
Click to expand...

Can you lock the RAM clock speed in the BIOS? My motherboard's BIOS allows for this and thus holds it close to 800MHz, as it should be, when I raise the bus speed to overclock the CPU. If not then perhaps there is an option to allow you to set the FSB : DRAM ratio so that you can keep the RAM close to the stock clock speed.

I wouldn't recommend jumping directly to 1.4V.
 
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I just tried on 3.2 at 1.4volts and it blue screened pretty fast. I will look to see my ram settings in BIOS after i have dinner. Thanks for the help so far guys:good:
 
mrjack said:
Can you lock the RAM clock speed in the BIOS? My motherboard's BIOS allows for this and thus holds it close to 800MHz, as it should be, when I raise the bus speed to overclock the CPU. If not then perhaps there is an option to allow you to set the FSB : DRAM ratio so that you can keep the RAM close to the stock clock speed.
Click to expand...
I found one in there called system memory multiplier (SPD) [auto] was the settings

In blue it had 800 and then 1002 so i think that means you are right with the ram going over.
When i go to change the auto it gives me things like 2.50A, 2.00D ect
Do i just chose the one closest to the 800? Im pretty sure i do but i just want to make sure before i get too far ahead of myself.
 
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