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First Intel Overclock: Breaking 4Ghz with E8400

post #1 of 3
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My last few systems have been AMD setups, but on my latest build I decided to turn to the dark side and go Intel. Unfortunately I don't have much experience with overclocking Intel chips, so hopefully someone can point me in the right direction.

I was able to inch my way up to a 420Mhz FSB without touching the vcore and leaving all other settings on default. Orthos ran without any errors for 5 or so hours at 3.78Ghz (will be running Prime95 tonight for a second test, hopefully for more than 5 hours). The trouble comes whenever I try to get above 420Mhz. 435Mhz with a vcore setting of 1.325 in BIOS (which was reported as being only ~1.28 in CPU-Z, not quite sure why) was bootable, and Orthos ran for 50 minutes before it gave an error and eventually BSoD'd.

So I guess my question is: should I go by the vcore reported by my BIOS or the level reported by CPU-Z? From what I've read, 1.36 volts seems to be the consensus for the highest I should try to go. Also I'm assuming the 4 memory dimms are putting extra stress on the northbridge. Would increasing the voltage of the NB help? If so, what is the safe voltage range for the X38?

Thanks for your help.
Briscoe
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 @ 3.825Ghz Asus Maximus Formula EVGA 8800GTS 512MB 4x1GB 1066 Ballistix Tracer 
Hard DriveOptical DriveOSMonitor
2x 15k RPM SCSI, 3x 750GB SATA 4x DVD Burners Vista Business x64 Samsung 245BW 24" 
KeyboardPowerCaseMouse
Logitech G15 Rosewill 850W Cooler Master Cosmos 1000 Microsoft Sidewinder Mouse 
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Briscoe
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 @ 3.825Ghz Asus Maximus Formula EVGA 8800GTS 512MB 4x1GB 1066 Ballistix Tracer 
Hard DriveOptical DriveOSMonitor
2x 15k RPM SCSI, 3x 750GB SATA 4x DVD Burners Vista Business x64 Samsung 245BW 24" 
KeyboardPowerCaseMouse
Logitech G15 Rosewill 850W Cooler Master Cosmos 1000 Microsoft Sidewinder Mouse 
  hide details  
Reply
post #2 of 3
Yeah I would try increasing other voltages like the nb or the ram even...im no ocing master but yeah i would think increasing the nb voltage would help you out. to my knowledge the nb can have a lot of voltage pumped into it so long as it stays cool. so im not sure there is any unsafe voltage (so long as you dont go overboard and correct me if im wrong here). For the bios voltage setting i would trust the bios and not cpu-z as it has reported wrong for me in the past...so yeah go with the bios ones. Hope that helps
post #3 of 3
The most common reason for CPU-Z reporting different voltages is vdroop. The loss of voltage that happens when the CPU is under load. Test a few other programs to see if they detect the same voltages. NB voltages need to be increased in order to obtain high FSB settings. Be safe and don't overheat!
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