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Problem while overclocking E8400

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maverick786us

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This is the first time I have ever performed an overclocking test. I first increased the VCore voltage from Auto to 1.30 in BIOS and then ran Intel Burn Test. But it never overclocked above 3007 :( I have TRUE heat sink. What could be the reason? I was expecting it to overclock somewhere near 3.4 GHz




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At stock voltage it reaches 3007
 
Raising the voltage doesnt overclock the CPU, you need to raise the FSB.
 
Nenu said:
Raising the voltage doesnt overclock the CPU, you need to raise the FSB.
Click to expand...

QFT.

You up the voltage to make the system stable once you have OCed, upping the voltage alone will do nothing but make allot of unneeded heat.

To hit 3.4GHz with a 9x multi you would need to up the FSB to around 377, but as you can see in your CPU-Z it's at 334, and 334 x 9 = 3006MHz.
 
all these thousands of posts along the lines of "xx ghz @ xxx volts" were bound to confuse someone eventually :p
 
Heh, this is the first time I've heard anyone assume that changing the voltage clocks the card as well!
Made I larf it did.
 
Finally got it. I managed to increase the FSB to 400Mhz and managed to OverClock it 3599Mhz. But the temprature reading was horrible. I've set the voltage to Auto and the VCore was automatically increased to 1.27 Volts.

There was a time when I set the VCore to 1.32 and tried to Overclock it, the tempreature of both the cores crossed 75 degrees. I was terrified and had to stop IntelBurnTest (thats why i was unable to take the screenshot).

Will there be any risk while playing games? When there is more load on the CPU? The volage will automatically increase with fixed FSB of 400Mhz.
 


What is the Maximum FSB E8400 Supports??

Is it true that if I keep the FSB maximum and set the VCore to Auto, then while overclocking the voltage will automatically increase and cross the thrashold limit finally causing the damage??
 
Maverick, in my experience with IntelBurnTest and my Q9550, the test usually makes the cores run about 15-20*C hotter than any game ever would.

Overclocking successfully and correctly is an extreme balancing act. You have to find the FSB that gets you to your clock speed goal, while keeping voltage as low as you possibly can so you can keep temps down as low as you possibly can. On top of all that, you have to make sure you keep the system stable, otherwise it will crash/reboot and could possibly damage your equipment or data.

It's in your equipment's best interest to not leave certain voltages on Auto, as Auto usually translates into more voltage than is needed. That's part of the overclocking process, finding the lowest necessary voltage to keep the computer running without errors.
 
75 is hot but if you keep distance to Tj >= 20 you are definitely fine (use RealTemp to see the temp & distance to Tj at the same time). These cpus don't even throttle themselves till over 100C and they shut down at high temps to prevent damage so there's not much to worry about < 90C (for short runs). IntelBurnTest will load your CPU much more than you likely ever will so it's ok if they're a bit higher than you like while testing stability.

btw, pamela anderson hasn't been sexy for like 10 years now. ;)
 
jimbo6846 said:
Maverick, in my experience with IntelBurnTest and my Q9550, the test usually makes the cores run about 15-20*C hotter than any game ever would.

Overclocking successfully and correctly is an extreme balancing act. You have to find the FSB that gets you to your clock speed goal, while keeping voltage as low as you possibly can so you can keep temps down as low as you possibly can. On top of all that, you have to make sure you keep the system stable, otherwise it will crash/reboot and could possibly damage your equipment or data.

It's in your equipment's best interest to not leave certain voltages on Auto, as Auto usually translates into more voltage than is needed. That's part of the overclocking process, finding the lowest necessary voltage to keep the computer running without errors.
Click to expand...

What is the minimum voltage do you recommend? For me stability and long life are the most important aspects. Although overclocking is important for me only when required. Mostly while playing games and doing video streaming
 
samsonJS said:
75 is hot but if you keep distance to Tj >= 20 you are definitely fine (use RealTemp to see the temp & distance to Tj at the same time). These cpus don't even throttle themselves till over 100C and they shut down at high temps to prevent damage so there's not much to worry about < 90C (for short runs). IntelBurnTest will load your CPU much more than you likely ever will so it's ok if they're a bit higher than you like while testing stability.

btw, pamela anderson hasn't been sexy for like 10 years now. ;)
Click to expand...

What is "distance to Tj " and how can i keep it?
 
maverick786us said:
What is the minimum voltage do you recommend? For me stability and long life are the most important aspects. Although overclocking is important for me only when required. Mostly while playing games and doing video streaming
Click to expand...

For the CPU, try ~1.175v for 3.0Ghz and 1.20v for 3.6Ghz.
 
samsonJS said:
75 is hot but if you keep distance to Tj >= 20 you are definitely fine (use RealTemp to see the temp & distance to Tj at the same time). These cpus don't even throttle themselves till over 100C and they shut down at high temps to prevent damage so there's not much to worry about < 90C (for short runs). IntelBurnTest will load your CPU much more than you likely ever will so it's ok if they're a bit higher than you like while testing stability.

btw, pamela anderson hasn't been sexy for like 10 years now. ;)
Click to expand...


OK distance to TJ Max is 62.

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But I didn't get this quite well. In real temp the core temperature reading is 33-34 and in SpeedFan its 43-44 almost 10 Degree difference. Which out of these 2 sensors is more accurate?
 
maverick786us said:
OK distance to TJ Max is 62.

my.php




But I didn't get this quite well. In real temp the core temperature reading is 33-34 and in SpeedFan its 43-44 almost 10 Degree difference. Which out of these 2 sensors is more accurate?
Click to expand...

Real Temp. Speedfan is unreliable at best. I believe the actual TJMax of the E8400 is 100*C, which if you change the TJMax setting in Real Temp, it will adjust the temps accordingly. Right now it's set to 95*C, so the temp readings in Real Temp will go up 5*C when you change the setting.

Idle temps are meaningless, really. Your real concern should be with how high your load temps get.
 
jimbo6846 said:
Real Temp. Speedfan is unreliable at best. I believe the actual TJMax of the E8400 is 100*C, which if you change the TJMax setting in Real Temp, it will adjust the temps accordingly. Right now it's set to 95*C, so the temp readings in Real Temp will go up 5*C when you change the setting.

Idle temps are meaningless, really. Your real concern should be with how high your load temps get.
Click to expand...

Correct.
 
edit: whoops, i see this has been answered already.

There are many threads about the difference in temperatures. You can set Tj max (PROCHOT temp) in CoreTemp and RealTemp so these are the apps you want to trust. RealTemp has been updated and will give you the correct value by default that's why I recommended it.

The gist of it is that intel cpus have a sensor that reports the distance to the temp that the cpu emits a signal called PROCHOT. It's a warning that the CPU is approaching the temp that it must throttle itself or shutdown, and until recently Intel had not published this temperature for 45nm chips so temp software programmers had to take educated guesses at the value.
 
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