Need help to OC i5 760

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Fermoz

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May 8, 2013
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Hello,

For some time now I have been trying to OC my i5 760. My recent stable (?) result is getting it up to 3,57 (21x170). The temps are alright in this speed, max 62c in prime95. I'm no longer using Auto on Core Voltage, instead I have set the value to 1.15. My VTT is set to 1.189, CPU PLL Voltage is set to 1.903 (have no idea what this does). DRAM and PCH is still on Auto.

Do anyone of you experienced clockers see something really weird here? It seems stable but I have gotten blue screen one time with this config. Another thing, do you think my power consumtion will be significantly higher with theese settings, compared to the original? I'm a noob at this so I would be greatful for an answer.
 
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Eximo

Eximo

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CPU PLL Voltage is the voltage supplied to the chip that controls clock frequency. You pretty much have that near maximum safe value.

If you are using DDR3 1600 and are running it successfully at 1700 that is not bad at all. My ram was certainly the bottleneck on my i7-950 (24x161@1.1875 volts) Only real option is to tell the system that you have DDR3- 1066 or 800 and then you should be able to bump up the BCLK. I've seen others use values as high as 225, though more commonly 212. Most chips seemed to top out around 4.1 or 4.2 Ghz, so 200 x 20 might be a good place to start trying. That would put the ram at 1600 exactly.

You can safely take the CPU core up to about 1.3 volts, any more and you have to start getting some serious cooling.
 
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Fermoz

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Ok ,thanks. I lowered my PLL voltage one step but the system got unstable so I went back to 1.903 but the system is still unstable. I'm not sure why though because it worked earlier :) Can I compensate the PLL V somehow because it seems strange that I'm so close to maximum on such low clock. I think that my dram is 1366 or something like that. At 1.3 volt my processor is getting a little too hot, my cooler is a Cooler master TX3.
 
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Eximo

Eximo

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Hmm, well ram and BCLK are tied at the hip, so you have to make sure the ram is stable. Speed of the ram isn't as important as getting a faster clock rate on the CPU. Ram ratio to BCLK gets you the frequency.

Stock Ram 170 200 212
133x6 = 800 1020 1200 1272
133x8 = 1066 1360 1600 1696
133x10 = 1333 1700 2000 2120
133x12 = 1600 2040 2400 2544

You've proven your memory will run at least 1700, backing down from that should increase stability in that regard. The key to CPU voltage is to get it to boot at a given speed and then back down until it crashes under load, go a little above that and that is what you need to achieve the clock.

You will have to find the top end limit of the chip coupled with your heatsink, you may have already found it, but you can try a few more configs.
 
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schmuckley

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tx3 is a terrible cooler..There are much better ones out there.
I think your vtt is too low...i run 1.27-1.3 on the one chips and up 1.4 on the others.
bump the vcore and vtt voltage some..but watch your temps.
 
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Fermoz

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Ok, thanks fpr the answers. Do you think it is a terrible idea to set the PLL Voltage to auto? I'm aiming for a quite moderate OC around 3.5 - 3.6. Right now the system is stable at 3.52. I'm thinking of trying to activate Turbo Boost again but I think it will fail. Earlier I wrote that my memories was 1333 mhz but they are 1600 mhz.
 
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