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Failed overclock with i5 760 @160 Mhz BCLK

post #1 of 5
Thread Starter 
This is my first ever attempt at overclocking and the system is the one shown in my profile (i5 760 with Gigabyte P55M-UD2). I don't want to overclock to get new speed records but to get the best value/money out of my system.

Yesterday I changed the BLCK from 133 to 160 and the multiplier from 21 to 22. However after a few minutes of prime 95, the temperatures of the cores raised to 80°C (non oc i have 48°C) , so I changed it to a multiplier of 21, QPI multiplier of 32 and deactivated turbo. I don't have experience in OCing but after reading that my board and CPU can be overclocked to 4 GHz without problems I thought such a light overclock should not be problematic.

However after like 20 minutes of playing Starcraft 2 the system shut down and I could not start it again. When I connected the power cable and hit the power button the fans ran for half a second and phase led 1 blinked for a moment but that was all. I reset the BIOS with the jumper and to be sure by taking out the battery for the moment but this didn't help also.

To my fortunate suprise this moment the pc worked again but im now afraid to change anything in the bios. However I would at least be glad to get my BCLK to 160 and the multiplier to 18 which my bios does when I activated "Xtreme Memory Profile". Because if I don't do this, I can't let my memory run at 1600 MHz which it is specified for because the max memory multi is 10.
So is it at least safe to do this? I'm really afraid now because I don't want to risk the life of my expensive i5 760 :-)

Also, is it "normal" behaviour after a OC that the PC does not start for hours or does that mean something is seriously broken?

On a side note, is it much of a performance hit to let my memory run at 1333 MHz with 9-9-24 timings instead of 1600 Mhz with 10-10-24?
As 1333 MHz memory is really cheap at the moment, is it a good idea to buy 8gb of 1333 Mhz memory?
    
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SAMSUNG SP2504C (OS) Hitachi HDS721616PLA380(Data) Toshiba SH-S223L Windows 7 64 Bit & Ubuntu 10.04 64 Bit (with Wubi) Samsung Syncmaster 204Ts 
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post #2 of 5
Quote:
Originally Posted by kirdie;11873565 
This is my first ever attempt at overclocking and the system is the one shown in my profile (i5 760 with Gigabyte P55M-UD2). I don't want to overclock to get new speed records but to get the best value/money out of my system.

Yesterday I changed the BLCK from 133 to 160 and the multiplier from 21 to 22. However after a few minutes of prime 95, the temperatures of the cores raised to 80°C (non oc i have 48°C) , so I changed it to a multiplier of 21, QPI multiplier of 32 and deactivated turbo. I don't have experience in OCing but after reading that my board and CPU can be overclocked to 4 GHz without problems I thought such a light overclock should not be problematic.

However after like 20 minutes of playing Starcraft 2 the system shut down and I could not start it again. When I connected the power cable and hit the power button the fans ran for half a second and phase led 1 blinked for a moment but that was all. I reset the BIOS with the jumper and to be sure by taking out the battery for the moment but this didn't help also.

Did you adjust the voltages? if so, what to?

and you probably won't notice the 1333Mhz vs 1600Mhz...games normally prefer the lower latency over the speed.

and no, it is not normal for the computer to not start after OC'ing.
    
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post #3 of 5
Try the multiplier at 21? mines at 21 x 195 and you see in my sig what kind of result I got. It could also be tht your motherobard isn't exactly liking the overclock.
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post #4 of 5
Try a BLCK of 191 and a CPU ratio of x21 (stick to odd numbers).

That will give you about 4GHz.

Set your RAM multiplier to x8 if you have a 1600 kit. That will give you a solid ~1,530MHz frequency.

From here, it's just a matter of finding the right CPU voltage to get stable. You can start a little high or a little low. I always like to aim a little high. Keep an eye on the temps and see if you're stable. If you are, try lowering it a bit. Rinse and repeat until you're comfortable or you lose stability.

Also, do you need 8GB of RAM? (The vast majority of people do not) If you don't, then having more memory will actually hurt your overclock, not help it.
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post #5 of 5
Thread Starter 
I did not adjust any voltages when I did my overclock. However now I am frightened that my PC will suffer permanent damage when I overclock another time, because it didn't start for hours after the first try. How big is the chance of that? And am I perfectly safe if I keep watching the temperatures?
    
CPUMotherboardGraphicsRAM
Core i5 760 P55M-UD2 Rev 1.1 XFX Radeon HD 5770 1GB 2x2GB 1600 CL7 Mushkin Silverline 
Hard DriveOptical DriveOSMonitor
SAMSUNG SP2504C (OS) Hitachi HDS721616PLA380(Data) Toshiba SH-S223L Windows 7 64 Bit & Ubuntu 10.04 64 Bit (with Wubi) Samsung Syncmaster 204Ts 
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Cherry MX 3000 LQCDE-2 Enermax ELT500AWT noname Razer Death Adder 
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Razer Goliathus 
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CPUMotherboardGraphicsRAM
Core i5 760 P55M-UD2 Rev 1.1 XFX Radeon HD 5770 1GB 2x2GB 1600 CL7 Mushkin Silverline 
Hard DriveOptical DriveOSMonitor
SAMSUNG SP2504C (OS) Hitachi HDS721616PLA380(Data) Toshiba SH-S223L Windows 7 64 Bit & Ubuntu 10.04 64 Bit (with Wubi) Samsung Syncmaster 204Ts 
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