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bus speed of new corei3/i5/i7 cpu

post #1 of 3
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What is the bus speed of new corei3/i5/i7 cpu?
The core2 series had bus speed of 800/1066/1333/1600mhz

like for i7 920 its qpi bus speed is 4.8gt/s,
how it is calculated in mhz?
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Cyrus
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post #2 of 3
So the QPI speed is 4.8 GT/s which is double the NB speed (2400 MHz); it is double because it can transfer in both direction simultaneously (NB - memory and reverse). For example a FSB 800 for a Core 2 had 800x32/8=3.2GT/s (32bit bus width and 8 bits/byte). The numbers however aren't directly comparable between Core ix and Core2 because of the different topology, latency, etc.

The i7/3/5 equivalent of the Core2 FSB is called base clock (or bclk). For all core ix CPUs bclk is 133MHz. For the i7 920, it has a CPU multiplier of 20 (20x133=2.66GHz) and a NB w/QPI multiplier of 18 (18x133=2.4GHz).
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post #3 of 3
Is QPI or DMI even technically a bus? Aren't they interconnects?
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Once again...
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