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i5 2500k voltage for 4.5GHz question

post #1 of 5
Thread Starter 
Greetings,

I have read some articles on overclocking the i5/i7 and they mention that I should edit the CPU voltage to 1.25mV in order to run stable at around 4.5GHz.

Now my question is the following, since the CPU is throttled down to 1.6GHz when idle on windows, won't the extra voltage damage it over time? Is there a specific option to allow voltage to go up and down depending on the usage, or will there be a constant voltage to the CPU?

edit:
Something I forgot to ask, should I put my RAM speed and timings as they are shown on the RAM modules, for example 1600MHz 8-8-8-24? Should I use 1T or 2T?

Thanks in advance for the help!
Edited by Demarki - 10/9/11 at 4:42am
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My Gaming Rig
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CPUMotherboardGraphicsRAM
Intel Core i5-2500K 4.7GHz 1.376V Asus P67 Sabertooth *B3 Revision* Gigabyte GeForce GTX 570 SoC 1280MB 900/2100MHz G.Skill RipJawsX (2x4GB) 1600MHz 8-8-8-24 1T 
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Crucial RealSSD M4 128GB 2.5" Samsung SpinPoint F3 1TB ASUS DRW-24B3ST Corsair A70 Dual Fan CPU Cooler 
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LG LCD 24" 1920x1200 Logitech G510 Gaming Keyboard OCZ StealthXStream 2 700W NZXT Phantom Enthusiast Full Tower Case - White 
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post #2 of 5
fill in your system info here(whys that linked not highlighted differennet color) User CP at top of page

depends on the ram, mine work fine at lower timings just have to add voltage
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post #3 of 5
Thread Starter 
I have added my system information, hope this helps.
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Crucial RealSSD M4 128GB 2.5" Samsung SpinPoint F3 1TB ASUS DRW-24B3ST Corsair A70 Dual Fan CPU Cooler 
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LG LCD 24" 1920x1200 Logitech G510 Gaming Keyboard OCZ StealthXStream 2 700W NZXT Phantom Enthusiast Full Tower Case - White 
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My Gaming Rig
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Intel Core i5-2500K 4.7GHz 1.376V Asus P67 Sabertooth *B3 Revision* Gigabyte GeForce GTX 570 SoC 1280MB 900/2100MHz G.Skill RipJawsX (2x4GB) 1600MHz 8-8-8-24 1T 
Hard DriveHard DriveOptical DriveCooling
Crucial RealSSD M4 128GB 2.5" Samsung SpinPoint F3 1TB ASUS DRW-24B3ST Corsair A70 Dual Fan CPU Cooler 
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LG LCD 24" 1920x1200 Logitech G510 Gaming Keyboard OCZ StealthXStream 2 700W NZXT Phantom Enthusiast Full Tower Case - White 
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post #4 of 5
Quote:
Originally Posted by Demarki View Post
Greetings,

I have read some articles on overclocking the i5/i7 and they mention that I should edit the CPU voltage to 1.25mV in order to run stable at around 4.5GHz.

Now my question is the following, since the CPU is throttled down to 1.6GHz when idle on windows, won't the extra voltage damage it over time? Is there a specific option to allow voltage to go up and down depending on the usage, or will there be a constant voltage to the CPU?

edit:
Something I forgot to ask, should I put my RAM speed and timings as they are shown on the RAM modules, for example 1600MHz 8-8-8-24? Should I use 1T or 2T?

Thanks in advance for the help!
Throttling - Extra voltage won't necessarily hurt if you're staying under the Intel recommended limit (1.5v). I ran my last intel cpu, E6850 at 1.35 for 4 years straight with no issue. It simply creates more heat at idle and uses more electricity. If you want to "feel good" and worry about too much voltage, then once you find your overclock settings you like, you can convert to "voltage offset". This allows the voltage to drop along with the clock at idle. And under load, it will ramp up CPU and voltage accordingly.

RAM - When overclocking, manually set this to the exact spec that is on the RAM chips or packaging. If it doesn't specify 1T or 2T, set it to 2T. You could then go to the manufacturers website and find the exact specifications for your RAM regarding 1T or 2T.
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post #5 of 5
You will need to use offset voltage which allows the voltage to drop along with the multiplier when the cpu is at idle or when it is under light usage, both C1E and Speedstep allow for that to happen.


Here is how to get offset working for when you know which value you need for your overclock:

Quote:
Originally Posted by munaim1 View Post

You need to know your VID for your particular multiplier.



Put the cpu under load and you should be able to see the currect VID.

You have to work out the difference between your VID and vcore and use that diffference when you set your offset value.

For example, if your VID is 1.355v and you require 1.365v for your overclock, change the offset to + and 0.010 to equal 1.365v under load. if you require a negative value vcore from the VID then set the sign to - and subtract the difference to what vcore you need.

Hope that clears things up.
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Sandy Transformed
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