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How far can I push my Phenom II 720 OC

post #1 of 7
Thread Starter 
Hi,

Spec:
Phenom II 720
Biostar TA790GX 128M
Titan Fenrir Evo.

Iv only OC it by uping the multiplier at the moment & have it at 3.3Ghz, everything else has been left alone.

Iv ran prime 95 & intel burn test just to see what the temps get to under load and i get 35c.

How far can I push it with by uping the multiplier with out damaging the CPU?
Or would i need to change anything else to get a better OC?

Any advice would be great thanks.
My System
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Phenom II 720 @ 3.3Ghz biostar ta790gx 128m On board HD 3300 Kingston 4GB 1066MHz HyperX Memory 
Hard DriveOSMonitorPower
Samsung F3 1TB windows 7 Acer H223HQ Coolermaster RealPower 520W Modular 
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thermaltake armor 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 720 @ 3.3Ghz biostar ta790gx 128m On board HD 3300 Kingston 4GB 1066MHz HyperX Memory 
Hard DriveOSMonitorPower
Samsung F3 1TB windows 7 Acer H223HQ Coolermaster RealPower 520W Modular 
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thermaltake armor 
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post #2 of 7
Quote:
Originally Posted by Paul1981 View Post
How far can I push it with by uping the multiplier with out damaging the CPU?
Or would i need to change anything else to get a better OC?
Just upping the multiplier wont cause you any damage, at all. Only way to fry your CPU is to go way abroad with voltage, wich is pretty hard to do accidently. Max Vcore is 1.55v.

For now just increase the multiplier until you crash in Prime95, then raise your voltage by 0.025v.
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post #3 of 7
Quote:
Originally Posted by Devilmaypoop View Post
Just upping the multiplier wont cause you any damage, at all. Only way to fry your CPU is to go way abroad with voltage, wich is pretty hard to do accidently. Max Vcore is 1.55v.

For now just increase the multiplier until you crash in Prime95, then raise your voltage by 0.025v.
This is the most simple way to do it. I hit a wall at 3.6ghz with my setup, but I run at 3.4 because of the low CPU voltage needed to run at 3.4 as compared to 3.6 for me.

Just play with the multiplier, you should be able to get 3.6ghz @ 1.45V with CPU-NB at 2600 mhz, at default 2000mhz hypertransport. I mean those are the basic numbers that MAY not be as efficient in power usage than sitting there for hours and testing each thing, but FOR SURE you should be able to run the CPU-NB at 2600 @ CPU-NB Voltage 1.35-1.4 no matter what speed your CPU is running.

Just try setting your ram speed as fast as possible with stock timings and play with the cpu multiplier. You shouldn't have to touch the FSB at all.

Oh and welcome to the forums, if you fill out your system specs, it'll be easier to help. Who knows you might be able to unlock it
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Dev0
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post #4 of 7
Thread Starter 
Thanks for the advice,

The CPU dont unlock i tried that when i first got the cpu when i using using the stock cooler, iv only got the Titan a few weeks ago so that's why im trying to OC it now.

Iv had a play with the multiplier but with no luck

I jumped a few & tried 3.7Ghz but system wouldnt boot, 3.6 & 3.5ghz system crashed during boot up. 3.4Ghz system loaded but as soon as i ran prime95 the system crashed, so back at 3.3ghz at for now.

As i say iv only messed with the multiplier at the moment. Im happy with the 3.3Ghz, but im just curious if there is much more to be had.

I do have Cool'n'Quiet disabled at the moment, would the OC work ok if i had that running as well?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 720 @ 3.3Ghz biostar ta790gx 128m On board HD 3300 Kingston 4GB 1066MHz HyperX Memory 
Hard DriveOSMonitorPower
Samsung F3 1TB windows 7 Acer H223HQ Coolermaster RealPower 520W Modular 
Case
thermaltake armor 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 720 @ 3.3Ghz biostar ta790gx 128m On board HD 3300 Kingston 4GB 1066MHz HyperX Memory 
Hard DriveOSMonitorPower
Samsung F3 1TB windows 7 Acer H223HQ Coolermaster RealPower 520W Modular 
Case
thermaltake armor 
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Reply
post #5 of 7
Just apply 0.025v more Vcore when you're at 3.4ghz, simple as that, and then run Prime95 again.

Turn off CnQ while overclocking, after you're done you can turn it on again.
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CPUMotherboardGraphicsRAM
1055T@3445MHZ 1.2V/ SB Pentium G620@0.84v ASUS M4A79XTD EVO/ ASUS P8P67 Sapphire 6870/ Club 3D 5770 2x2gb Kingston DDR3 1333mhz @ 1467mhz 7-7-7-17 
Hard DriveOSPower
Samsung Spinpoint F3 1TB Windows 7 Home 64bit Corsair 600W 
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CPUMotherboardGraphicsRAM
1055T@3445MHZ 1.2V/ SB Pentium G620@0.84v ASUS M4A79XTD EVO/ ASUS P8P67 Sapphire 6870/ Club 3D 5770 2x2gb Kingston DDR3 1333mhz @ 1467mhz 7-7-7-17 
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by Devilmaypoop View Post
Just apply 0.025v more Vcore when you're at 3.4ghz, simple as that, and then run Prime95 again.

Turn off CnQ while overclocking, after you're done you can turn it on again.
Cool,

If its that simple il try later this evening when i have some more spare time.

If its stable could i increase it to 3.5ghz on the same vcore or would i need to think about increaseing the vcore again?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 720 @ 3.3Ghz biostar ta790gx 128m On board HD 3300 Kingston 4GB 1066MHz HyperX Memory 
Hard DriveOSMonitorPower
Samsung F3 1TB windows 7 Acer H223HQ Coolermaster RealPower 520W Modular 
Case
thermaltake armor 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 720 @ 3.3Ghz biostar ta790gx 128m On board HD 3300 Kingston 4GB 1066MHz HyperX Memory 
Hard DriveOSMonitorPower
Samsung F3 1TB windows 7 Acer H223HQ Coolermaster RealPower 520W Modular 
Case
thermaltake armor 
  hide details  
Reply
post #7 of 7
Quote:
Originally Posted by Paul1981 View Post
Cool,

If its that simple il try later this evening when i have some more spare time.

If its stable could i increase it to 3.5ghz on the same vcore or would i need to think about increaseing the vcore again?
No, don't increase the vcore until it becomes unstable. And just to reiterate you can set the multiplier to a million and it won't hurt your CPU, it just won't boot. The only way overclocking could hurt your CPU is for it to overheat or for you to try to push too much voltage, and most motherboards have shut off temperatures to save your system from dieing. My Phenom II 720 is running @ 3.6GHz no problem. I am using 1.4vcore
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