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Help Overclocking Intel E8400

post #1 of 11
Thread Starter 
I decided to overlclock my CPU yesterday, so I tentatively increased the CPU FSB from 333 MHz to 340 MHz, ran the computer, stress tested it, benchmarked it etc. and it worked fine. I then moved it up to 350 MHz, and when my computer restarted, nothing displayed (not even the bios). All then fans were running, but i didn't hear the Windows turn on sound so I know it didn't boot. I reset the bios back to default manually, then restarted the machine. Works fine running at 340 MHz. How do I solve this problem? BTW the same thing happens if I increase the PCI-E FSB to 106 MHz or above.

This is my first attempt at properly overclocking a computer, so please be kind.

CPU: Intel Core 2 Duo E8400
Graphics Card: Nvidia 9800GTX+ (with latest drivers)
Motherboard: ASRock G43Twins-FullHD
RAM: 2GB DDR2-1066 (x2)
OS: Windows 7 64-bit (with latest updates)
Bios: Version 1.90
Edited by Ilikeporkpie - 2/12/11 at 4:05pm
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Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
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Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
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Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
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post #2 of 11
Stop what you're doing before you end up killing something. PCIe frequency isn't something you touch.

I suggest you start reading more before you start attempting to OC.
http://www.overclock.net/intel-cpus/...ed-guides.html
More specifically this.
http://www.overclock.net/intel-cpus/...g-updated.html

Also, fill in your PC specs here.
http://www.overclock.net/specs.php?do=addsystem
post #3 of 11
Thread Starter 
Sorry, I should have said: the PCI-E FSB is locked at 103 MHz whenever the CPU FSB is changed from it's default value.
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CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
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My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
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post #4 of 11
Set it to 100Mhz or set it to Auto.
post #5 of 11
Thread Starter 
Quote:
Originally Posted by mbudden View Post
Set it to 100Mhz or set it to Auto.
I can't. Even if it is on auto the bios sets it to 103 MHz and greys it out until the CPU FSB is set back to 333 MHz.
My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
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My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
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post #6 of 11
Thread Starter 
Quote:
Originally Posted by Ilikeporkpie View Post

This is my first attempt at properly overclocking a computer...
When I say that I mean overclocking the CPU by manipulating the bios; I have been using software to overclock my GPU for many years.
My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
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My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
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post #7 of 11
Not a great overclocking mobo if it does not allow you to control its settings. You will not have clue whats causing instability when the mobo randomly changes unrelated settings like that.

Good news. E8400's are great overclocking CPU's. Your Mobo may not be up to it though.

Personally I would look at getting either one of the Asus P5Q series mobos or a Gigabyte Ep45-UDP3 mobo or any mobo that has x48 chipset.

they are better overclockers and usually have full control over voltages and timings.

Also, you need to look at aftermarket cooling if you wish to reach a big overclock.
post #8 of 11
Thread Starter 
Quote:
Originally Posted by mbudden View Post

I suggest you start reading more before you start attempting to OC.
http://www.overclock.net/intel-cpus/...ed-guides.html
More specifically this.
http://www.overclock.net/intel-cpus/...g-updated.html
I am not a complete newb at overclocking. I have been reading material on overclocking on and off for about 5 years now, and I am currently studying for a degree in Electronic Engineering, so most of the stuff in those guides I know already ( As I said in my post above I am currently overclocking my GPU). Before now I have never had the money nor inclination to go out and buy a motherboard capable of overclocking, and now I have I was hoping for some help rather than an automatic "Euh you're a newb, read the guides" response.
My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
  hide details  
Reply
My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
  hide details  
Reply
post #9 of 11
Thread Starter 
Quote:
Originally Posted by mbudden View Post

Stop what you're doing before you end up killing something. PCIe frequency isn't something you touch.
The reason I was fiddling with that was because I was trying to fix a prehaps related problem that is causing my GPU to function on only a x2 apture size rather than a full x16. My hope was that I would find a particular frequency and voltage that would trick it into working properly, alas it did not work.
My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
  hide details  
Reply
My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
  hide details  
Reply
post #10 of 11
Thread Starter 
Quote:
Originally Posted by dihartnell View Post
Not a great overclocking mobo if it does not allow you to control its settings. You will not have clue whats causing instability when the mobo randomly changes unrelated settings like that.

Good news. E8400's are great overclocking CPU's. Your Mobo may not be up to it though.

Personally I would look at getting either one of the Asus P5Q series mobos or a Gigabyte Ep45-UDP3 mobo or any mobo that has x48 chipset.

they are better overclockers and usually have full control over voltages and timings.

Also, you need to look at aftermarket cooling if you wish to reach a big overclock.
I did only get this motherboard recently, so I don't really want to get another new one soon...

This motherboard can control voltages and timings... it' just that particular setting that it doesn't like changed.
My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
  hide details  
Reply
My Computer
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel E8400 Asus P5Q Pro Asus GTX 650 TI Boost DDR2 8GB 
Hard DriveOSMonitorKeyboard
Samsung SSD 840 EVO Windows 7 64-bit Hannspree ST251MAB Generic 
PowerCase
Corsair CX750M Enermax Ostrog 
  hide details  
Reply
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