Overclocking Voltages

[Haider]

Hi,

I run a everyday overclock on i5-760 of 177 BLCK x 20 multiplier giving me about 3.5GHz. My Vcore 1.24 and Vtt is 1.15. My temp hit mids 60s underload and I have running this config since the start of the year. I have been able to isolate my blck to 200 with a vtt of 1.2. Now Intel quote Vtt as 1.155 typical max value. There is another value of 1.21 which is the absolute maximum beyond which you permanently damage your CPU. I look around the web and people have a lot larger overclocks but with out of spec vtt voltages e.g. 1.3/1.4. Are these people INSANE!?

I would not take my Vcore above the 90% value (1.26) should I take my Vtt over the 1.155 threshold but under 1.21?

Asus P7H55/USB3, Intel i5-760, Enermax NAXN82+ 650W, Sapphire Radeon HD 7950 Vapor-X and Crucial Ballistix Elite DDR-1600MHz.


Thanks
Haider

 

[Saylick]

Intel revised their spec sheet a bit after they released Lynnfield. See below:
Max Vtt = 1.4V, p. 65

With that said, I personally wouldn't push my Vtt over 1.25V.

 

[Haider]

Thanks for the update. I managed to run at 200 blck x 18 multiplier 3.6 GHZ, Vcore=1.225 and IMC/Vtt=1.2 rock solid stable with good temps on an overnight run of Prime95. I then moved onto try a x19 multiplier I moved the Vcore upto 1.245 and was still not able to get 3.8GHz stable. To me that seems like a lot more volts and a decent chip I thought you would have been able to achieve 3.8GHz on those blck, multiplier and voltage settings?

Ho hum I will try and push to 20 multiplier to see if I have a multiplier hole at 19. I don't plan on using this all the time just for games that are CPU hog like the GTA series etc...GPU will have to overclocked beyond 950MHz first. I think I will see a bigger bang per buck that way for most games than going from 3.5Ghz to 3.8GHz. From what I have read the 4.0GHz is really pushing the Vcore (& chip) up against the envelope for everyday use. It's no drag racer and I wanna play longer than 1/4 mile