OCUK Sandy Bridge, SB-E and Ivy Bridge 5GHZ Club

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I think I got a very poor CPU :(


1Day: All i've done is enabled PLL Overvoltage, raised the turbo offset voltage and lowered PLL a tad to try to get better temps. Any other volts (or anything else) I can change to increase stability/clock?

I've disable Spread Spectrum, should I change C3/4/5/6 stuff?
 
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tommytinkle said:
You're quibbling .1 of a mhz?!?! It changes by the second. I can prime at 5Ghz at 1.36volts as shown in the screenshot. Half an hour so far, still going though :)

Not sure whether to try for some more or not ;)
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Forgive me for what seems a quibble I am a bencher. 5GHz for me means 5GHz not almost 5GHz or nearly 5GHz but actually 5GHz ;) But all that counts is that you are happy and with that CPU you should be very happy. Like I said I think you have a outstanding CPU.:)


JBOD you are right on the money with your voltages. Like I said earlier it is pretty normal to need 1.440 vcore to get past 5GHz and you have done that with 1.424 so you are ahead of the game as far as I can see.

I only disable that stuff because I need to have my real clock speed showing when I am taking a screen shot, but I do not need to disable them to reach that overclock. With SB you can leave all that stuff enabled and it is not going to mess with your overclock. If your temps are good and within safe ranges then it might be worth setting your vcore up a touch. Oh and set LLC at 1 if a Gigabyte board or 75% if a Asus board and try that. But at all times pay attention to temps. Let temp be your guide in all things.
 
1Day said:
Forgive me for what seems a quibble I am a bencher. 5GHz for me means 5GHz not almost 5GHz or nearly 5GHz but actually 5GHz ;) But all that counts is that you are happy and with that CPU you should be very happy. Like I said I think you have a outstanding CPU.:)


JBOD you are right on the money with your voltages. Like I said earlier it is pretty normal to need 1.440 vcore to get past 5GHz and you have done that with 1.424 so you are ahead of the game as far as I can see.

I only disable that stuff because I need to have my real clock speed showing when I am taking a screen shot, but I do not need to disable them to reach that overclock. With SB you can leave all that stuff enabled and it is not going to mess with your overclock. If your temps are good and within safe ranges then it might be worth setting your vcore up a touch. Oh and set LLC at 1 if a Gigabyte board or 75% if a Asus board and try that. But at all times pay attention to temps. Let temp be your guide in all things.
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Right, back home I go to the pc later to make it 5100 instead ;) Any input on the PLL? Can you lower that a bit to reduce heat?
 
tommytinkle said:
You're quibbling .1 of a mhz?!?! It changes by the second. I can prime at 5Ghz at 1.36volts as shown in the screenshot. Half an hour so far, still going though :)

Not sure whether to try for some more or not ;)
Click to expand...


It's just a formality, you are there matey, no one is quibbling lol, but technically speaking it doesnt show 5ghz, quick screengrab of cpu-z under load and posting it is simple no?
 
vcore not stable

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hi, not posted on here for a long time, but come on and read posts a lot, I need some help with a 2500k, just clocked it to 5ghz and the vcore in cpu-z goes up and down a little it dosen't stay stable is that correct? matter of fact its like that dosen't matter what speed i set the cpu at..running 4.2 for everyday use
 
I think that the overclocking bug has bitten quite a few if you go through this thread. :)

@tommytinkle When I am benching at 5.7GHz I tend to have my PLL lower than what is on auto. So auto is 1.8 and I will bench at 1.65 or 1.70 depending on how intense the application is on my CPU load wise. So yes - you can play with lower PLL to get the heat down.

tfc475 I can not see which version of CPU-z you are using. I have really bad eyes so forgive me if it is obvious to all others. But there will be some movement in vCore depending on what background operations there are going on. If you want an accurate vCore reading try CPU-z 1.57

gcaster - you are hooked mate. Welcome to the crazy bunch.

Simon thanks again for a great thread. Kudos to you for starting it mate.
 
JBod said:
What cooling are you using? Seem pretty good to me.
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Hey mate,

Using a thermalright ultra 120 with two 120mm fans in push pull. Only Scythe things though, so very quiet and don't move a lot of air! Tempted to change them for some higher flowing ones!

1Day said:
Badboy we wear our badges on the inside mate. :D

@Tommy those temps are very very good. Can't believe you are running prime at 5GHz. Makes what I do look pretty tame mate.
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Hey 1day,

Ah thanks for putting my mind at rest! I thought they were a little high but if they are deemed acceptable I may as well run the big 5 0 24/7. At 4.8Ghz it barely breaks 55 degrees!
 
tommytinkle said:
Hey,

Thanks mate - The temperatures aren't so great under prime I don't think! May need to invest in some better cooling -

Here's 5Ghz prime temps, not brave enough to try 5.1 yet!
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Your temps are very similar to me. I am also curious to know what acceptable full load temps are too. Also remember that nothing in reality application/game wise will get that warm. Mine goes no higher than 55/58c running for an hour racing. I'm on a Noctua D14 just for reference.

Nice ramp there mate;)
 
Hey guys,

What other voltages besides cpu core are you changing to get up as high as you are? I've only changed vcore and it seems 5.2 is about my limit with that. Can I change any other voltages to get better clocks?

Thanks
 
The SB CPU is a strange beast. Some CPU's will just not clock past a particular frequency.

Just what kind of voltages are we talking here Tommy? To get into the upper 5GHz you are going to need good cooling to keep your CPU safe and quite a hefty bump in voltages. Some folks are having to go mid 1.6's to get 5.4GHz and up.

PLL lower is something I do to for my one CPU and the other has a very narrow vTT range and if not within that narrow band will not boot into OS.
 
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