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Jumping Multiplier? Core i5 2500K

post #1 of 3
Thread Starter 
Recently bought a Core i5 2500K and asrock z68 Extreme 4 and decided to try overclock it.

I tried bumping up the multiplier to 45, leaving CPU voltage as Auto and tried running Prime blend test and monitor the status of the multiplier using cpuz.

To my surprise, according to cpu-z, the value of multiplier is jumping all over the place (doesn't stay fixed at 45). I tried setting my vcore to a fixed value and it got even worst (multiplier can go as low as 33). The multiplier will remain close to value of 45 when changing vcore back to auto.

BTW, cpuz also shows ever-changing core voltage. When the voltage goes down so do the multiplier, when it goes up, the multiplier goes up too.

Is this how it suppose to work? An ever-changing multplier and vcore?

I use this as a guide as a reference to overclock my system: http://www.overclock.net/intel-general/910467-ultimate-sandy-bridge-oc-guide-p67a.html.

I left all the other voltage options fixed at it's default value and LLC at level 5. C1E, EIST, C3, C6 and CPU Thermal Monitor to disable. I use Real Temp 3.67 to monitor my cpu temp and it doesn't hit over 70C so I guess overheating is not the answer.
Edited by loftystew - 6/11/11 at 11:30pm
My Upgraded Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.9GHz (1.368V) Asrock Z68 Extreme 4 R6850 Cyclone 1GD5 Power Edition/OC 2 x 4GB Corsair Vengeance 
Hard DriveOSPowerCase
WD Velociraptor 150GB & Seagate Barracuda 500GB Windows 7 Home Premium (64-bit) Seasonic M12II 620W Coolermaster HAF X 
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My Upgraded Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.9GHz (1.368V) Asrock Z68 Extreme 4 R6850 Cyclone 1GD5 Power Edition/OC 2 x 4GB Corsair Vengeance 
Hard DriveOSPowerCase
WD Velociraptor 150GB & Seagate Barracuda 500GB Windows 7 Home Premium (64-bit) Seasonic M12II 620W Coolermaster HAF X 
Mouse
Razor Abyssus 
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post #2 of 3
Thread Starter 
Nvm, got my problem solved. I need to enable EIST and turbo to overclock.
My Upgraded Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.9GHz (1.368V) Asrock Z68 Extreme 4 R6850 Cyclone 1GD5 Power Edition/OC 2 x 4GB Corsair Vengeance 
Hard DriveOSPowerCase
WD Velociraptor 150GB & Seagate Barracuda 500GB Windows 7 Home Premium (64-bit) Seasonic M12II 620W Coolermaster HAF X 
Mouse
Razor Abyssus 
  hide details  
Reply
My Upgraded Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.9GHz (1.368V) Asrock Z68 Extreme 4 R6850 Cyclone 1GD5 Power Edition/OC 2 x 4GB Corsair Vengeance 
Hard DriveOSPowerCase
WD Velociraptor 150GB & Seagate Barracuda 500GB Windows 7 Home Premium (64-bit) Seasonic M12II 620W Coolermaster HAF X 
Mouse
Razor Abyssus 
  hide details  
Reply
post #3 of 3
With speedstep the chips are designed to throttle down to 1600mhz when not stressed passed a certain percentage. There is no reason to run the clock at the max value of your OC all the time. Your designated OC frequency will kick in at quite a low load % anyway.
Air 540
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 3570k @4.8ghz MSI z77 MPower  MSI GTX 780 Lightning Sli 8GB Corsair Vengeance White  
Hard DriveHard DriveCoolingOS
Intel 520 Series 120GB WD Caviar Black 1TB NZXT Havik 140 W7-Home Edition x64bit 
MonitorKeyboardPowerCase
ASUS 23.5@ 1920x1080 120hz Logitech G110 Black USB Wired LED Backlit Corsair AX 750 Corsair Air 540 
MouseMouse Pad
Logitech G700  GIGABYTE GP-MP8000 Extreme Accuracy Gaming Pad 
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Air 540
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 3570k @4.8ghz MSI z77 MPower  MSI GTX 780 Lightning Sli 8GB Corsair Vengeance White  
Hard DriveHard DriveCoolingOS
Intel 520 Series 120GB WD Caviar Black 1TB NZXT Havik 140 W7-Home Edition x64bit 
MonitorKeyboardPowerCase
ASUS 23.5@ 1920x1080 120hz Logitech G110 Black USB Wired LED Backlit Corsair AX 750 Corsair Air 540 
MouseMouse Pad
Logitech G700  GIGABYTE GP-MP8000 Extreme Accuracy Gaming Pad 
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