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

SimonMaltby · 8 Feb 2011 at 17:32

Well my new OEM cpu is quite different from my normal one. It does a higher suicide clock hitting the 55 multi. I have managed to run up to about 5550MHz (just)

Despite it having a higher clock it requires quite a lot more voltage to be stable at lower speeds. for 4.8 my main chip requires 1.3v this one needs 1.4v

I need to do a bit more learning but on overall I still think my first chip is better hitting 5.4 and running lesser speeds at lower voltage.

Biffa · 8 Feb 2011 at 20:26

I've hit a 5.0 wall. 5.1 wont boot no matter what, or if I apply it after booting it just locks solid at idle

1Day · 8 Feb 2011 at 20:51

Biffa I can not recall your motherboard brand. Do you have the option to enable PLL over ride?

Another trick to push past these little hiccups is to change your BCLK to a odd number. So if you are sticking at BCLK at 1000 try 1003 or 1001 even. Similarly if you are on a odd number change it to an even number. There is sound reasons why this works but it takes forever to explain. Just try it.

bobbydigital · 8 Feb 2011 at 20:55

Got myself an oem 2600k (in place of 2500k) to see if I can get a 24/7 5ghz overclock. So here is a new superpi screenshot

cmsbfent · 8 Feb 2011 at 21:25

Hows the tweaking going simon? Still battling on with mine, the temps are so much higher with HT on I'm finding, around 7 degrees difference at load when turned on. Does this sound about right?

When I get a nice stable base of 12+ hours, I'll reseat the chip a few times to try and get an improvement, but cant see me getting this chip to 5ghz whilst staying under 70 degrees

Currently testing 4.9 ghz and am 2 hours into prime with a vcore of 1.385 giving a load v of 1.400

And bobbydigital, thats what I have done for the exact same reason. 5ghz just sounds right

Have you tried the superpi run at a lower voltage?

bobbydigital · 8 Feb 2011 at 21:38

Nope just done 5 linx passes and away to play some games, then prime overnight. Just guessed these settings for now!

Couldn't get my 2500k to stay prime stable at anything over 4.6 no matter how much volts I tried, guessing a bad chip even though was linx stable at 1.38v @ 4.8ghz if I put even 1.5v (just a test) it failed prime within 30 mins. Gave up trying all the other settings and all the guys at work bought a 2600k so felt left out!

Chuggerboom · 8 Feb 2011 at 21:45

I know it's not a Sandy Bridge chip but hey

cmsbfent · 8 Feb 2011 at 21:53

GET OUT!!

bobbydigital · 8 Feb 2011 at 22:42

Biffa · 8 Feb 2011 at 23:17

1Day said:
Biffa I can not recall your motherboard brand. Do you have the option to enable PLL over ride?

Another trick to push past these little hiccups is to change your BCLK to a odd number. So if you are sticking at BCLK at 1000 try 1003 or 1001 even. Similarly if you are on a odd number change it to an even number. There is sound reasons why this works but it takes forever to explain. Just try it.

MSI P67A-GD55 running latest beta bios, but they have all been the same so far.

PLL override always turned on, well ever since it became available in bios.

Hmm will take a look, didn't have much luck in the past messing with the BCLK on these SB's

What about lowering it? Does that work if I try 999 or 997?

SimonMaltby · 9 Feb 2011 at 01:26

cmsbfent said:
Hows the tweaking going simon? Still battling on with mine, the temps are so much higher with HT on I'm finding, around 7 degrees difference at load when turned on. Does this sound about right?

When I get a nice stable base of 12+ hours, I'll reseat the chip a few times to try and get an improvement, but cant see me getting this chip to 5ghz whilst staying under 70 degrees

Currently testing 4.9 ghz and am 2 hours into prime with a vcore of 1.385 giving a load v of 1.400

And bobbydigital, thats what I have done for the exact same reason. 5ghz just sounds right Have you tried the superpi run at a lower voltage?

Right I have given this OEM chip a fair bit of time tonight and I got it to 5.590MHz but not with any stability and it needed over 1.6v to get there. So although it's a better headline score it is not really useable.

I can't get it prime stable at 5GHz and even struggle to get Prime stable at 4.8GHz

What it does do is run prime at - 0.125v at 35 Multi that's 0.88 to 1.070 in CPUz switching between 1.6Ghz and 3.5GHz. Which is very nice thankyou, so this OEM chip is going in the NAS / Media Center box (Asus P8H67 Pro). Will do the switch tomorrow and put my 5.4GHz chip back in this machine.

Then I supose it's a case of waiting for a C Batch to come along

bobbydigital · 9 Feb 2011 at 05:40

Right kept running my 5ghz clock @ 1.42v played just under 2 hours of black ops, then watched a 1080p movie (2 hours 6 mins) while either playing wow, browsing msn etc and was stable as a rock. Tried running prime but when I came back computer had BSoD, played about putting voltages up further but no joy seems to be failing in under 30 minutes with prime

So decided to try playing about with offset voltage instead to see if I can get a more stable overclock and have been faced with this new low vcore super pi run

Bito · 9 Feb 2011 at 06:41

@bobbydigital..... What batch do you have?

bro306 · 9 Feb 2011 at 06:49

bobbydigital said:
Right kept running my 5ghz clock @ 1.42v played just under 2 hours of black ops, then watched a 1080p movie (2 hours 6 mins) while either playing wow, browsing msn etc and was stable as a rock. Tried running prime but when I came back computer had BSoD, played about putting voltages up further but no joy seems to be failing in under 30 minutes with prime

So decided to try playing about with offset voltage instead to see if I can get a more stable overclock and have been faced with this new low vcore super pi run

Try Linx with latest pack! It helped me get my best 24/7 5Ghz setting!

bobbydigital · 9 Feb 2011 at 06:50

Sorry this is my 2600k oem and I forgot to check it before I put in machine, will take it out and try my 2500k at weekend again and let you know. If any help I ordered from ocuk on monday.

Trying it now bro306, I've even managed to reduce my LLC settings, peaking at 1.36v under linx just now. Fingers crossed

cmsbfent · 9 Feb 2011 at 07:37

Morning

What offset are you using bobby digital?

Passed the 12 hour mark at 4.9ghz

100mhz to go!!

bobbydigital · 9 Feb 2011 at 08:09

Currently running high LLC (50%) and offset of +0.1v has peaked at 1.416v full load according to cpu-z want to work on getting it down but earlier I had max of 1.38v and linx was failing after 2 passes.

Will get 100% stable first then worry about lowering

Edit: Just failed around about 10 passes

1Day · 9 Feb 2011 at 17:33

Simon I have taken the OEM plunge too. Will report back on what I find. You never know I might get lucky. Again

JBod · 9 Feb 2011 at 19:12

Do we have any known good batch numbers yet?

Edit : I received a new OEM 2500k today L101B056.. not found any results for it yet it seems pretty damn new.

Adyx · 9 Feb 2011 at 20:30

Asrock are really slow with their bios updates

extreme4 has been updated but extreme 6 hasn't!

I don't really want to use the beta bios to get over 1.52 volts, so guess I'll wait a little longer before I take the plunge into 1.33a

I should be able to get higher, I can boot to 5.2+ghz not so stable with 52x100 and 54x97 so hopefully more volts will let me combine 54x100