Bought an OCUK '4.8Ghz' chip, can barely get to 4.6Ghz.

Martini1991 · 3 Jul 2011 at 12:53

Phenomenologica said:
Sandybridge is very poor indeed? Almost everyone can overclock it from 3.3 at stock to 4.5Ghz stably. It's possible to push them up past 5Ghz if you get a good chip. What's so poor about it? If you're getting random BSODs due to the overclock all you have to do is nudge the voltage up 0.005 and see if it helps, it's pretty quick!

I've had 4.6GHZ Prime Stable, yet it'll topple playing a game, or even idle?
This is a launch day chip, I had two other chips I've used that did 4.8GHZ perfectly fine, NO BSOD ever, and a 2500k at 4.6GHZ which again, NO BSOD.

bulldog147 · 3 Jul 2011 at 15:04

I think my sandybridge cpu had died, only 5 out of 8 cores working on stock speed under load ?

Core 5, 7 and 8 no longer working

Justintime · 3 Jul 2011 at 15:08

Tried resetting your Board BIOS? Maybe your HT is screwed up. You've only got 4 physical cores btw. Are you using 8 threads to test?

bulldog147 · 3 Jul 2011 at 15:12

Yes 8 threads testing, I try reset BIOS. Complete fed up with this board to be honest! Got cold boot issues again when switched on.

Shakeel · 3 Jul 2011 at 19:36

bulldog147 said:
Yes 8 threads testing, I try reset BIOS. Complete fed up with this board to be honest! Got cold boot issues again when switched on.

any updates. have you managed to fix the issue?

bulldog147 · 3 Jul 2011 at 19:39

Yes it all ok now (phew!) I had to reset bios but it rather annoying from cold boot issues ongoing!

1kiwi · 3 Jul 2011 at 19:41

As soon as I worked out that IBT, Lynx and Prime Small FFTS were next to useless for measuring stability all of my BSOD's went away. @Bulldog, I honestly doubt it's the Gigabyte board or the CPU if you are indeed 8 hours Prime Blend stable. Have you tried running mem test?

bulldog147 · 3 Jul 2011 at 19:43

my memtest all passed with no error

paradisiac · 4 Jul 2011 at 08:02

bulldog147 said:
my memtest all passed with no error

how many cycles?
i tend to aim for 10-16 cycles.

rjk · 4 Jul 2011 at 08:55

bulldog147 said:
Maybe my board Gigabyte Z68 is a crappy board then !

not really. your board is a cut down version of my UD5. a very capable board.
I had the P67 version of your board before that also and had no issues.
we use your motherboard for system integration. it is far from poor.

bulldog147 said:
I think my sandybridge cpu had died, only 5 out of 8 cores working on stock speed under load ?

Core 5, 7 and 8 no longer working

pics? or is it just dropping out cores in prime when under load.
is that overclocked

bulldog147 said:
Yes it all ok now (phew!) I had to reset bios but it rather annoying from cold boot issues ongoing!

the cold boot comes from not being overclocked properly.
keep trying.

sandy bridge is a superb platform. I seem to to remember you having the same problems when you got that 980x...

bulldog147 · 4 Jul 2011 at 13:28

Rjk maybe I don't understand the bios setting overall properly on the Z68. Very difference from EX58. Can you please sent me the right setting for 4.60GHz for Z68 UD4 if you can, so I will try again to see if it stop being cold boot issues again! Thanks.

What I did is leave everything on Auto. Put vcore at 1.38V Level 5 LLC for 4.60GHz (46x100) and F10 and enter (with prime blend ran for 24 hours passed) then next day switched on, pc kept going on and off with cold boot issues. I switched off the main wall and turn it back on, it start to load windows 7 with 4.60GHz (rather strange) with no cold boot issues! I still on board default BIOS firmware F4.

rjk · 4 Jul 2011 at 14:00

bulldog147 said:
That's why I brought 1155 motherboard and i7 2600K myself and do the overclocked manual myself (no more ocuk bundles) because of past experience. No offence to you ocuk.

bulldog147 said:
Rjk maybe I don't understand the bios setting overall properly on the Z68. Very difference from EX58. Can you please sent me the right setting for 4.60GHz for Z68 UD4 if you can, so I will try again to see if it stop being cold boot issues again! Thanks.

not really. that's why we sell overclocked bundles...

NathWraith · 4 Jul 2011 at 14:02

Bulldog we cannot just send you OC settings. As rjk said, that is why we sell overclocked bundles!

paradisiac · 4 Jul 2011 at 14:03

NathWraith said:
Bulldog we cannot just send you OC settings. As rjk said, that is why we sell overclocked bundles!

could someone that bought the bundle not just post these, or do the bundles require you to sign a secrecy clause?

NathWraith · 4 Jul 2011 at 14:10

paradisiac said:
could someone that bought the bundle not just post these, or do the bundles require you to sign a secrecy clause?

Technically yes but settings vary from motherboard to CPU so settings from one persons bundle may not work on another persons.

Ace Modder · 4 Jul 2011 at 14:10

The settings can vary chip to chip and board to board anyway.

The production of silicone isn't 100% perfect!

bulldog147 · 4 Jul 2011 at 14:10

NathWraith said:
Bulldog we cannot just send you OC settings. As rjk said, that is why we sell overclocked bundles!

No worry, I do it myself, learning and patience is the key. I will find a way! I don't buy overclocked bundles anymore because it never stable on my last bundles from you, as I had to do it myself at the bios manual setting rather than OCUK set everything on Auto and crashed my FSX fives time before I changed the bios setting myself and got stable at 191x21 rather than 200x20.

Intel did metion to me that overclocking is never stable, never is !

wilko49 · 4 Jul 2011 at 14:12

Mr Krugga said:
I'm sorry, I have no experience with Sandy Bridge CPUs.

I also find IBT to be largely irrelevant in the stress-testing scenarios with my i5 750.

I found IBT very helpful - I wouldn't use it as the only stability test, as it seems to fail less often than Prime, but it usually failed very quickly (ie, less than 5 minutes compared to over an hour in prime). I used it to get rough settings, then ran 8-hour primes until I was happy, then ran a 24-hour (was all about the 38º ambient in that last one).

I still got a BSOD though - forgot to check for stability when turbo kicked in on 1 core

paradisiac · 4 Jul 2011 at 14:15

NathWraith said:
Technically yes but settings vary from motherboard to CPU so settings from one persons bundle may not work on another persons.

but then is that not contradicting the 'guaranteed 4.8GHz OCable chips'? the only way you can 'guarantee' it is by trying that chips in a minimum of 5 mobos of different brands or something. as you are saying one mobo/cpu setup will give different results to an identical mobo with the same cpu :confused:

rjk · 4 Jul 2011 at 14:23

paradisiac said:
but then is that not contradicting the 'guaranteed 4.8GHz OCable chips'? the only way you can 'guarantee' it is by trying that chips in a minimum of 5 mobos of different brands or something. as you are saying one mobo/cpu setup will give different results to an identical mobo with the same cpu

not really.
the guaranteed 4.8GHz CPU gives the end user piece of mind that it has hit those speeds before they buy. we do state the hardware that the overclock is achieved on for the customers own reference. if they choose to use different hardware then that's obviously their own decision. the chip has been proven to work on the hardware stated. it is made quite clear that overclocking results have to be obtained by manual overclocking.
the main thing is that 4.8GHz can be a difficult clock to achieve on low volts so it is a much better idea having an advantageous starting point. i.e. a cherry picked CPU.