In the DDR3 forum you provided the following response to a user asking about running 12GB, wher you suggest against running 6 sticks, you do the same quite often with DDR2 and running 4 sticks. I posted a reply also shown below, and rather than tie up the other users thread, thought this should be separate. My response is based on working with systems for some 25 years now. Am I totally off base here with my explanation or is your response off base. I can provide a number of reference material from which I gleaned my knowledge of how dual channel/memory controllers/chipsets/etc work. Have I been wrong all this time, mislead by Intel, among others?
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GSKILL TECH
Administrator
Join Date: Jul 2008
Posts: 117
well, i would not recommend to run 6 modules. it is not just the heat issue.
the problem is the memory controller.
tri-channel memory controller has a very weak channel. YEAH, YOU SEE EVERY MOTHERBOARD WANTS YOU TO USE 1-3-5 OR 2-4-6. why? because other channel is WEAK.
if you want to use 6 modules, you might need to
1. increase the QPI volt. (make memory controller stronger)
2. increase the memory volt (make memory signal stronger)
3. decrease the speed of memory. (prevents memory controller overload)
NO3 is the best way to do because 1 and 2 might cause overheat problem
Join Date: Feb 2009
Posts: 96
Default
Actually on most mobos, say with 4 RAM slots (P43, P45, most chipsets), SLOTS 1 and 2 are physically connected to Channel A, slots 3 and 4 are physically connected to Channel B. Each Channel has 64 bit access, hence when you install in slots 1-3 or 2-4 you are putting a stick in each channel thus enabling DUAL-CHANNEL mode or 128bit access. There is nothing to do with a 'weak' channel.
Also note, I used the 4 slot boards as an example, because the excuse you offer above about tri-channel is the same exact thing you tell people all the time about dual channel have a 'weak' controller.
If what you are saying is true, then what is the 'weak' channel? is it channel A or Channel B, particularly in light of the fact you NEED both channels to run DUAL-Channel and get the 128 bit access
Would appreciate a reply.
----------------------------------------------------------------------------------------------
GSKILL TECH
Administrator
Join Date: Jul 2008
Posts: 117
well, i would not recommend to run 6 modules. it is not just the heat issue.
the problem is the memory controller.
tri-channel memory controller has a very weak channel. YEAH, YOU SEE EVERY MOTHERBOARD WANTS YOU TO USE 1-3-5 OR 2-4-6. why? because other channel is WEAK.
if you want to use 6 modules, you might need to
1. increase the QPI volt. (make memory controller stronger)
2. increase the memory volt (make memory signal stronger)
3. decrease the speed of memory. (prevents memory controller overload)
NO3 is the best way to do because 1 and 2 might cause overheat problem
Join Date: Feb 2009
Posts: 96
Default
Actually on most mobos, say with 4 RAM slots (P43, P45, most chipsets), SLOTS 1 and 2 are physically connected to Channel A, slots 3 and 4 are physically connected to Channel B. Each Channel has 64 bit access, hence when you install in slots 1-3 or 2-4 you are putting a stick in each channel thus enabling DUAL-CHANNEL mode or 128bit access. There is nothing to do with a 'weak' channel.
Also note, I used the 4 slot boards as an example, because the excuse you offer above about tri-channel is the same exact thing you tell people all the time about dual channel have a 'weak' controller.
If what you are saying is true, then what is the 'weak' channel? is it channel A or Channel B, particularly in light of the fact you NEED both channels to run DUAL-Channel and get the 128 bit access
Would appreciate a reply.
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