Intel 925X: Exploring the Overclock Lockby Wesley Fink on June 23, 2004 12:05 PM EST
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IndexAlmost as soon as the 875/865 chipsets were introduced last year, we were dealing with news stories about PAT being implemented on the 865 chipset. This Intel "875-only" feature was quickly and cleverly being introduced on the mainstream 865 chipsets by the Taiwanese motherboard makers. This was not what Intel had intended, but it was a testament to the engineering capabilities of the major board manufacturers.
The just-introduced Intel 925X and 915 chipsets seem destined to continue the tradition of Intel trying to limit the chipset features. This round, the hot topic is Intel's attempt to limit or lock-out overclocking on the new chipsets, and the clever engineering that companies, like Asus and Abit, are doing to get around this new issue.
Our early testing confirms what you may have already heard -- Intel has limited the overclocking on their new chipset to about 10%. In looking at boards from smaller or less savvy board makers, you simply can't overclock beyond 10% over specification. We first became suspicious of a lock because some Prescott chips are already overclocking as much as 50% and higher on Intel 875P systems. Given that fact, why should these same cores suddenly be such poor overclockers on 925X/915? The answer, of course, is that the chipset is different and it handles overclocking differently.
When an attempt is made to boot at more than about 10% on a 925X or 915, the system simply reboots or shuts-down. We have not been able to get any kind of official explanation from Intel, but board makers tell us that Intel has added an overclocking limiter that resets a PLL and reboots or shuts down the system if overclock attempts are made at speeds over about 110% of specification.
So, are we stuck with 10% overclock limits if we choose the new Intel chipsets? Fortunately, some of the major manufacturers have found ways around this issue.
UPDATE: Intel's Reply. Intel declined to officially answer our question about whether they have implemented a 10% Overclock Lock on the 915 and 925X chipsets. Intel provided the following official statement:
"Intel has done extensive evaluation of our 915G/P and 925X chipset products and have designed them to run robustly at 800FSB. Any use or operation of these chipsets beyond their specifications, including overclocking, has not been evaluated or validated by Intel. If a board provider decides to overclock their platform, they do so at their own risk, since this action will void the warranty for the Intel products. Additionally, from time to time, Intel may choose to implement functionality that helps to ensure that the Intel product experience is not degraded by those who may try to run our products out of spec."