And the the main difference between DDR2 and DDR3 is that DDR3 can run its I/O bus clock at four times the memory clock but with higher latencies and DDR3’s prefetch buffer is 8 bits deep. The prime difference between DDR1 and DDR2 is that DDR2 can run its I/O bus clock twice the memory clock but with higher latencies and DDR2 has prefetch size of 4 bits as opposed to DDR1’s 2 bits.
Finally the 3rd is the Effective Data Rate.
The first is DRAM Core clock or memory Clock.
When it comes to RAM OCing we mainly concerned with :ĭDR(1/2/3) RAM modules have 3 types of ‘clocks’ associated with them:
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