The URL below tells that i3-2120 has 3.3GHz CPU clock and a bus/core ratio of 33.
This means that the FSB base-clock is 3.3GHz/33 = 100Mhz.
Since FSBs are quad-pumped, we can just look at it as 100*4MT/s = 400MT/s
Say, each transation transfers 8 bytes (64-bit), this leads to 3200MB/s or 3.2GB/s
The URL above says that there are 2 memory channels.
Assuming 2 CPUs can simultaneously read (not sure how), we can say that the max bandwidth to CPU is around 6.4GB/s
However, the URL specifies that the RAM used is DDR3-1066/1333 and specifies the max-memory bandwidth as "1333*8*2MB/s" = 21GB/s
My question is what is the point in having a super-fast memory while the data to CPU can be transferred only at a much lower rate... I am so confused by all these numbers. Can someone lend me some help?