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

Quote:
All of our testing was done on the following configuration:-
- Asus P8P67 Pro Motherboard
- Corsair 4GB 1600MHz Dual Channel Kit
- Corsair TX 650W Power Supply
- Akasa Nero II CPU Cooler
- Upto 1.4v Vcore voltage for 24/7 stability of the CPU.

I thought OCUK say that all sandybridge must not go over 1.38 as it stated here:

***OVERCLOCKING GUIDELINES***

- Do not exceed 1.35-1.38v core voltage, doing so could limit lifespan of the CPU
- Do not overclock with BCLK, again doing so could limit lifespan of the CPU
- Recommended memory voltage is 1.50v, so make sure to run your memory at 1.50v, higher could limit lifespan of the CPU
- These recommendations come from OcUK and Intel, your warranty is un-affected but we highly recommend you adhere to the above to make sure your CPU lifespan is un-affected
- All Sandybridge CPU's worldwide should be run at the above or lower voltages, no higher!

So why is OCUK say not to go over 1.38V and now saying it ok up to 1.40V ? Confused !
 
The initial limit was specified after about a week of the 2600/2500K's being released. We still don't know what the max safe limit is. Many of us including myself are running at 1.4v
 
beh* said:
We still don't know what the max safe limit is. Many of us including myself are running at 1.4v
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Yeah, that's very true!

Many of us still using between 1.35v to 1.40v but I think anything up to 1.40v at the bios will be fine as the chip will be fine within the next 10 years! But, we all probably changing new chip in 4 years time anyway!
 
so dont all 2500k/2600k chips not do 4.8GHz with 1.4v?
sorry, i dont have the best cooler so cant go past 4.4GHz for long enough to prime, but i thought 1.35v was the norm max volts but 1.4v got most chips to 4.8/5.0GHz. or are some chips stuck at 4.6GHz, even with 1.4v?
 
Justintime said:
I'd say most will do that speed at 1.4v, i know of coupla really bad ones that needed like 1.39v for 4.5Ghz.
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oh right. i have a poor cooler, which is annoying. mines priming @ 4.4GHz with vcore of 1.240v which isnt anywhere near the 1.39v so hopefully mines not a bad chip.
 
Justintime said:
To be fair my foot, if you sell an overclocked product you don't 'guess' its stable you bloody well do it right or don't sell it. Guessing can lead to downtime and unneeded annoyance for the customer, and they bought the darn thing because likely they didn't want to be hassled or didn't know much about overclocking.
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That isn't how a business works. It's far more time and cost effective to whack everything to a set voltage where 99.9% of products will be fine and sell them, then deal with the tiny quantity of returns. The alternative is to waste thousands of hours testing them all individually. If OcUK did that they would probably be out of business. No product range is 100% perfect as it's far too costly to achieve and brings no benefit at all the the business. Whatever the product, be it graphics cards, cars, or overclocks, you will have faulty units. Expecting otherwise is absurd.
 
Phenomenologica said:
That isn't how a business works. It's far more time and cost effective to whack everything to a set voltage where 99.9% of products will be fine and sell them, then deal with the tiny quantity of returns. The alternative is to waste thousands of hours testing them all individually. If OcUK did that they would probably be out of business. No product range is 100% perfect as it's far too costly to achieve and brings no benefit at all the the business. Whatever the product, be it graphics cards, cars, or overclocks, you will have faulty units. Expecting otherwise is absurd.
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If you sell something, then its in your interest to make sure your product works as advertised, especially something as variable as an overclocked product that people pay EXTRA for the assurance of a hassle free experience. I've had to fix 3 of their mistakes and i'm hardly a big time technican who sees hundreds of machines a day, its locally in some place in Edmonton on the side job.. if 3 of those mistakes can pop up there i wonder how much country wide there is?
 
Justintime said:
If you sell something, then its in your interest to make sure your product works as advertised
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To an extent yes. But once you reach a certain fraction of products working properly it becomes cheaper to deal with the returns than to push it higher, especially considering a fair number of people will either fix it themselves or OcUK can help them fix it easily over the phone. No matter how passionate the staff here are about computers etc it is still a business, and first and foremost it has to make as much money as possible.
 
The whole point of stability testing is to assure yourself the computer is 100% stable, surely? Prime testing for less than an hour really doesn't give you much of an idea. I've had overclocks fail long after an hour.
 
colthillary said:
i tend to go for 20 mins prime and then game away.

If it crashes in normal use then I up the voltage etc

Works for me!
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Run IBT with maximum RAM used if you don't have time or can't be bothered to wait.

Instability can cause chip degradation.

I agree with Justintime, if you're not stress-testing properly, why bother at all?

Some rigs can run for days stable and will crash at some point but the point of stress testing is to minimise the probability of having an unstable system.
 
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