Core i5 lower QPI bus multiplier

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POSTER: computer news   ||   CORE I5 LOWER QPI BUS MULTIPLIER	DATE:2009-04-25
In  Intel core i7 processors the resulting QPI bus frequency is formed just like AMD 64 hypertransport ,using a frequency generator and multiplier. However, the QPI bus multiplier is blocked for all processors, except in extreme edition series, and it composes 18x for Core i 7-920 and Core i 7-940. In core i 7-965 processors there is a possibility of selection between 18x, 20x and 24x. Thus, the minimum multiplier composes 18x, and it is capable in a number of cases to limit the overclocking potential . As report associate, in core i5  processors the QPI bus multiplier will compose 16x. From the overclocker side, this is good, since it will allow to reach a high frequency . In contemporary processors core i7 the threshold stability lies in the region of 8 billion transactions per second, which corresponds to the frequency 220 MHz with the 18x multiplier, and with the 16x for achievement of this threshold will be required 250 MHz. The PCI express controller will be integrated in Core i5, after transferring, in essence, the functional north bridge under the processor. However, the realization of PCI express controller is completely uncommon. Commutation with the processors will be achieved by the QPI, whose multiplier will compose in all 16x. This it allows to reach the capacity of approximately 4.2 billion transactions, which corresponds to the effective data transmission speed of approximately 17 GB per second. Related Products :

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