Hey all, i was reading this article that says amd's ACC overclocking software was created to use w/ BE cpus cause it does something "special" w/ the cpu multiplier inparticular, and hardly does as good when doing fsb overclocking:
http://ixbtlabs.com/articles3/...n-a7da-s-790gx-p3.html
its saying BE cpus used to be non-essential for overclocking since most cpus had high multipliers and only needed a slight increase in fsb, so the price premium for BE processors was not worth it. W/ the release of ACC this all changed cause w/ BE cpus it allowed for much higher overclocks:
Up until recently buying Black Edition processors has been a matter of taste. What concerns Phenoms, owing to high default multipliers they usually require an insignificant raise of FSB clock even for serious overclocking (with increased voltage). Most motherboards can do that, at least among models for overclockers. Besides, any processor can be overclocked by raising the reference clock, while only several models come as Black Editions.
However, with the appearance of "mysterious" Advanced Clock Calibration in SB750 Southbridge, processors with the unlocked multiplier become a technically expedient choice (taking into account democratic prices for Phenom X4 9850 Black Edition, such processors are economically expedient as well). We've set ACC +2% (for all cores) and obtained extra 400 MHz to the result without ACC. We were surprised to see the overclocking potential so expanded and full stability at such frequencies. With disabled ACC, further overclocking resulted in startup failures, and raising the voltage by any value was of no help (these facts suggested that the overclocking potential was squeezed dry). Note that ACC is effective only when you overclock the system by increasing the multiplier. At least we've seen it in two Phenom processors (see the table above). This technology had absolutely no effect on Phenom X4 9550, overclocked by raising the bus frequency. The same with the 9850. When we tried to overclock them above 2900 MHz by raising the bus frequency, the system immediately responded with instability. By the way, when we installed an Athlon processor, the ACC option disappeared in BIOS menu. So we couldn't check whether this technology can squeeze extra MHz from unlocked models of this series. From the look of it, the official recommendation from AMD to enable ACC only for Phenom Black Edition processors is well grounded.
any truth to that? It says they managed a whopping 400mhz extra overclock w/ ACC? they were using an older phenom1 cpu, but im guessing that still carries over to phenom2's no?
thanks in advance.
http://ixbtlabs.com/articles3/...n-a7da-s-790gx-p3.html
its saying BE cpus used to be non-essential for overclocking since most cpus had high multipliers and only needed a slight increase in fsb, so the price premium for BE processors was not worth it. W/ the release of ACC this all changed cause w/ BE cpus it allowed for much higher overclocks:
Up until recently buying Black Edition processors has been a matter of taste. What concerns Phenoms, owing to high default multipliers they usually require an insignificant raise of FSB clock even for serious overclocking (with increased voltage). Most motherboards can do that, at least among models for overclockers. Besides, any processor can be overclocked by raising the reference clock, while only several models come as Black Editions.
However, with the appearance of "mysterious" Advanced Clock Calibration in SB750 Southbridge, processors with the unlocked multiplier become a technically expedient choice (taking into account democratic prices for Phenom X4 9850 Black Edition, such processors are economically expedient as well). We've set ACC +2% (for all cores) and obtained extra 400 MHz to the result without ACC. We were surprised to see the overclocking potential so expanded and full stability at such frequencies. With disabled ACC, further overclocking resulted in startup failures, and raising the voltage by any value was of no help (these facts suggested that the overclocking potential was squeezed dry). Note that ACC is effective only when you overclock the system by increasing the multiplier. At least we've seen it in two Phenom processors (see the table above). This technology had absolutely no effect on Phenom X4 9550, overclocked by raising the bus frequency. The same with the 9850. When we tried to overclock them above 2900 MHz by raising the bus frequency, the system immediately responded with instability. By the way, when we installed an Athlon processor, the ACC option disappeared in BIOS menu. So we couldn't check whether this technology can squeeze extra MHz from unlocked models of this series. From the look of it, the official recommendation from AMD to enable ACC only for Phenom Black Edition processors is well grounded.
any truth to that? It says they managed a whopping 400mhz extra overclock w/ ACC? they were using an older phenom1 cpu, but im guessing that still carries over to phenom2's no?
thanks in advance.
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