Hello PPL of Bit-Tech! WAZUUUP!!! I am starting a forum just like most of people here because I run into some problems. I am just finished with building my baddies PC. Here are his specs: Win7 Pro 64Bit | I5 760 | Asus P7P55D | 4GB G.Skill 1600 7-8-7-24-2N| 1TB Samsung F3 | Sapphire ATI 6850 | Logitech Z-2300 | OCZ ModXStream Pro OCZ700MXSP 700W ATX12V |. I been trying to overclock this I5-760 to stable 24/7 4.0GHz at low voltages like a lot of people claims that it good for. Man I am tired been going up and down volts all day in blue screen surroundings. Here is what I tried so far Vcore anywhere from 1.3V~1.36, ICH anywhere 1.2V~1.36, PPL 1.8V. People seem to be claiming 4.0 are achievable on 1.3 low Vcore and ICH 1.3. I mean sure I can get booted in windows no problem, but prime95 fails just in few hours. Massage keeps pooping up “Prime95 stopped working error”. Little help here guys.
all chips are different. your friends CPU may not be able to run as low of voltages as what other people are claiming. you just have to give it enough juice to make it stable, no two ways about it. ive run my i5-750 to 4ghz with 1.38v vcore, 1.32v vtt, 1.9v pll, but that doesnt mean those settings will work for your friends chip. mine runs stable at those settings, but too hot for my taste. right now im running 3.8ghz with a 1.25v vcore and everything else set to "normal". EDIT: also, read through this: How to overclock the core i5 it focuses on the i5-750, but your friends 760 will be similar.
What CPU cooler are you using? I don't see it mentioned on your post. If it is stock cooler you will never reach 4ghz
thats not the VID the VID is the default Vcore required to run at stock speed and it will be somethin around the 1.0-1.3V run CPU-z it should say
i dont think 1.36v is high for 4ghz. if anything, its probably a little low. but if its not stable at 4.0ghz with 1.36v then that explains why it seems low; because it is. you need to keep applying voltage until its stable. thats how it works. personally, i wouldnt run anything over 1.4v for a daily, stable OC with very good cooling. the CPU can certainly handle more than that, but why push it so hard when theres little gain to be had? benchmarking? sure. everyday usage? ill keep mine below 1.4v thanks.
I ran an i5-750 for months at 202x20 on an Asus P7P55D with 1.38125vcore, 1.375vtt and 1.9v pll. I then upgraded the motherboard to a P7P55D-E Pro which was not stable at the same settings, had to drop it back to 200x20. Temps not a problem, never above 70° with a corsair H70.
I always wonder if people who are posting great overclocking results on low voltages are properly stress testing their settings. I've overclocked so many cpu's and so far I haven't found a single "great" chip.
What should my VVT/IMC be at? Is 1.3 on core and 1.366 on IMC too much? My prime 95 error out after 18 hours is it okay or need more?
What are your temps like? Quite often I will find the maximum comfortable voltage a system will support before I finish the overclock. My i5-750 with a H70 is really cool at 1.38125 so I decided that was my max long term voltage and tweaked the speeds to suit. Back in the uk my watercooled i7-920 is happy at 1.5v so that is what I worked with on the overclock. 1.5v is a little extreme but I reckon LGA2011 will be here long before the chip dies. I had the i5-750 at 1.45v but temps would get up into the high 70°'s so I backed it off to 1.38125v, where it never breaks 70°. Then it was literally a week long process of increasing by a couple of MHz and leaving P95 running for the night. If successful add another and leave P95 running whilst at work. Once I got to where it fell over, I backed it off my 1 MHz and left it for 24 hours. Reading interesting things about Intel's burn test software though, somewhere in the forums they say it will take 5 mins to do the same thing as 24 hours of P95. All the time I was testing the CPU and adding a little extra, I left the ram on the lowest multiplier so that would never be the reason for a failed stress test. Only once I had found the highest frequency for the CPU did I bring the ram up to speed and include in final stress testing. That said I just installed a different mobo so that I could use sli GTX480's and I am back to starting the process again.
You're looking at about 1.4V+ for 4GHz. A word of advice, I wouldn't bother with an IMC above 200MHz, it's a lot more hassle getting it stable unless you're willing to put in the effort (and you won't get much out of it after that). Just stick with 200x20 and you'll be fine As for temps, anything about 80C in stress testing is acceptable, keeping in mind that with day to day usage, you won't go anywhere near that.
What is it currently set at? You're probably looking at around 1.3V or so, maybe a bit more, maybe less.
