Those of you with OcUK OEM 2700K Official OC Results thread!!

[bulldog147]

Very true, cheaper board won't get any good clockers with 2500K/2600K/2700K. Had to buy high end mobo, a good cooling (exspecially custom water)

 

[Nelly]

Guys, if you get one of these then make sure you have a good board to pair it with. I cheaped out and regret it, although this MSI Z68A-GD55-G3 is far from a bad board it's just not top-end when it comes to clocking an i7

The difference between a cheap and decent board when clocking can be huge, you cheap skate, thats what you get for buying a cheap B-grade MSI board.

JediFragger, Have you set Internal PLL Overvoltage = [Enabled] ? when your going over 4.5GHz that is a must, otherwise you wont even boot up.

From when I bought the MSI Z68A-GD65 (G3) end of July on Release BIOS I've gone from 4.4GHz stable on auto volts to 4.6GHz on auto volts stable with the latest beta bios 24.4 dated 27/10/11 that MSI sent me this morning.

You can use the MSI Z68A-GD65 (G3) BIOS on the MSI Z68A-GD55-G3 motherboard as they use the same BIOS.

 

[Aurhinius]

Not sure a "good" board will make a huge difference.

What would you rate as a good board? Where would you draw the line?

At most 100-200mhz difference.

Usually the issue for a mainboard is the vdroop. You can compensate for that though.

I'd say your MSI would be up to the task no problem just keep an eye on the vdroop.

 

[bulldog147]

My Gigabyte Z68X UD4 B3 board is very bad on the vdroop and even worse Gigabyte won't allow me to get fixed offset with LLC select (it will be disabled and under normal mode if using offset)

I don't know why is Gigabyte (top brand name) won't let us using LLC with offset ?

 

[Aurhinius]

May be fixed in a bios update. Can't really say but a UD4 is a good board. Don't use offset. Try a fixed voltage. Works a charm on my Asus P67 PRO

 

[JediFragger]

JediFragger, Have you set Internal PLL Overvoltage = [Enabled] ? when your going over 4.5GHz that is a must, otherwise you wont even boot up.

From when I bought the MSI Z68A-GD65 (G3) end of July on Release BIOS I've gone from 4.4GHz stable on auto volts to 4.6GHz on auto volts stable with the latest beta bios 24.4 dated 27/10/11 that MSI sent me this morning.

You can use the MSI Z68A-GD65 (G3) BIOS on the MSI Z68A-GD55-G3 motherboard as they use the same BIOS.

Cheers Nelly, I'm currently at 4.7Ghz on Auto volts (1.328v under load) and IBT/Linx stable (20 passes on max) but that's without PLL Overvolt enabled too (I use a Noctua D14 with the fans turned down slightly but with an RV03 case)

 

[Boostjunky]

Whilst I await Boostjunky's feedback, I've managed to get the system prime stable at 4.8Ghz with 1.365 volts in BIOS which is undervolting to 1.360 under load in CPU-Z.

Temps are 67degC on coolest core and 74degC on hotest core but it is blooming cold in my office!

Sorry for the late reply mate, I tried my chip at 4.8 this morning, mine did an hour of prime at 1.35v which is close to your result.

My Asrock motherboard has different options to your Asus board so I don't know whether that makes a difference. Refer to any decent review of the Asrock Fatality board and it shows the bios options. However I can maintain the same temps as you at upto 1.44v so you are probably being limited by cooling. I'm on custom watercooling though with 2x240 rads a Laing pump and EK Supreme waterblock in a CM 690 case.

One thing I have noticed is that my 2700k chip does run hotter than my previous 2600k.

I have also noticed from trying to get 5.2ghz stable on my chip that when you began to get close to 80 degrees and over it caused instability.

 

[Nelly]

Cheers Nelly, I'm currently at 4.7Ghz on Auto volts (1.328v under load) and IBT/Linx stable (20 passes on max) but that's without PLL Overvolt enabled too (I use a Noctua D14 with the fans turned down slightly but with an RV03 case)

Hi on the MSI Z68A-GD65 (G3) the motherboard undervolts the ram slightly using the ram listed below so maybe 2 nudges above auto maybe required as I need this at x46 multi for stability.

If you have a voltage tester maybe worth checking out.

Crucial 2X2GB CT2KIT25664BA1339 first mem kit tested
Corsair CML8GX3M2A1600C9W 1,35V Vengeance kit currently on the MB

Source

This is the settings I use within CPU Features and within ECO - Energy Saving sections of the BIOS.

MSI Z68A-GD65/55 (G3) - Overclock Settings

Also Click >> BETA UEFI Releases for Z68A-GD55/65 (G3) [MS-7681 v4.0] [E7681IMS.Nxx releases]

 

[bulldog147]

May be fixed in a bios update. Can't really say but a UD4 is a good board. Don't use offset. Try a fixed voltage. Works a charm on my Asus P67 PRO

How to do fixed voltage ?

 

[VortX]

Yes Intel tech documents show a range of upto 1.425v as safe.

We deem upto 1.45v is safe, any higher though is unknown territory.

Could you reference this please Gibbo? I can't find these documents?

EDIT: Also, if these are the new "official" recommendations, why haven't you updated the original thread?

 

[Westyfield2]

OcUK are doing one i7 2700K @ 5.00GHz System, the "Ultima Tyrannosaur".

 

[bulldog147]

It already there last week!

 

[mmj_uk]

OcUK are doing one i7 2700K @ 5.00GHz System, the "Ultima Tyrannosaur".

So what happened to:

1. Anyone who wants to OC will not buy a CPU from us in fear that all the regular ones are poor clockers.
2. Any guaranteed CPU too 5GHz will have a large premium due to the time and resources involved.
3. We simply don't have the time to pre-test 500 CPU's, we have far better things to do.

What happens to the tested CPU's which fail to reach 5ghz for these systems? they get thrown back into stock presumably?

p.s. I've not had a chance to check my 2700k yet.

 

[Bluntwrapped]

So what happened to:



What happens to the tested CPU's which fail to reach 5ghz for these systems? they get thrown back into stock presumably?

I wondered the very same thing yesterday man

 

[bulldog147]

It probably "Up to 5GHz" I guess !

 

[mmj_uk]

They have a BF3 [email protected] system too but again that begs question what happens if the cpu's fail to reach 4.8ghz? or is it the case that OCUK have found all of the cpu's tested are hitting at least 4.8ghz?

 

[Gibbo]

They have a BF3 [email protected] system too but again that begs question what happens if the cpu's fail to reach 4.8ghz? or is it the case that OCUK have found all of the cpu's tested are hitting at least 4.8ghz?

Not a single CPU has failed to hit 4.8GHz yet.

The T-Rex system was at 5GHz but it was failing test, so it was changed back too 4.8GHz, but unknown to myself tech had been looking into it and it turns out the issue was not CPU's, but the mainboard being used in that system. But were finding the CPU's were not the issue.

They have changed the mainboard from Asus P8Z68-V too the Maximus and are now finding that system operates at 5GHz stable.

So hence as I said earlier, a good motherboard is critical for frequencies beyond 5GHz and the Maximus is a good choice.

 

[Surveyor]

So you only need a £315 motherboard

 

[bulldog147]

Gibbo was right afterall. You pay for what you get maximum clocker is get a very good high end motherboard. I should have brought a very high end mobo in the 1st place. It all my fault, but hold on, my cpu could be ease get to 5GHz if I get a good high end board because I believe that my current board Gigabyte could limit 4.8GHz+ unless I had to push up vcore bit higher!

 

[Geeman1979]

I have 2 boards which are the Gigabyte UD7 and a Gigabyte Z68X-UD4 B3 and have tested both with my 2600k. Now for the difference in the price and specification the UD7 doesnt perform any better than the UD4 regarding stability or higher overclocks.