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BCLK question

post #1 of 5
Thread Starter 
quick question, im a little confused on the whole memory QPI BCLK frequency stuff. from what I have read, the base clock of the memory and the base clock of the processor are best being synchronous, which would mean that they have the same base clock frequencies,right? well if I drop some DDR3 2133 ram (with base frequency 266.67MHz) into a z68 board with an i5 2500k, where the default qpi frequence (i think thats the right term) is 100mhz, would the 266.67 ram frequency drop down to 100 to match the qpi? or is there a divider or multiplier to keep it up? thanks for clearing this up
post #2 of 5
If you install the 2133 RAM on a SB mobo, it will downclock the frequency to 1333MHz by default. Fortunately, you can revert it back to the manufacturer's recommended freq. of 2133MHz by enabling the XMP memory profile, and/or by manually setting the timings/frequency.

IOW, SB BLCK keeps every clock in sync. So upping the BLCK will up the clock of everything connected, which is why Intel forcefully recommends (OCing the BLCK is difficult and dangerous) the multiplier-based OCing.
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post #3 of 5
With SB, you have a certain set of multipliers to work with assuming a BCLK of 100. You have 10.66, 13.33, 16.00, 18.66, 21.33 and on some Asus boards, 24.00.

If you have 2133 memory, drop it in and choose the 21.33 multiplier.
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post #4 of 5
Thread Starter 
thanks guys, you both provided the answer i was looking for. +rep for skulltrail, thank you xxbassplayerxx.
post #5 of 5
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