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Assuming the following DDR2 dual channel RAM setup on a Gigabyte P35-DS4 rev 1.0 board:

Channel 0:
Bank #0 : DDR2-800
Bank #1 : DDR2-800

Channel 1:
Bank #0 : DDR2-1066
Bank #1 : DDR2-1066

Will the

  • memory frequency be 800 MHz for both channels or
  • will each channel run at its specific maximum frequency (800 for channel 0, 1066 for channel 1)?
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    I'm 99.94% sure that both channels will downgrade to the slowest RAM speed of 800 MHz
    – MonkeyZeus
    Jan 9, 2015 at 17:17
  • The manual for your motherboard should describe what will happen in a case like this. In most cases lower clocked memory will cause all memory to run at that speed.
    – Ramhound
    Jan 9, 2015 at 17:22
  • Typical behavious in all motherboards where I looked it is to drop the speed to the lowest common setting. In this case to 400MHz (the DDR2-800 speed).
    – Hennes
    Jan 9, 2015 at 20:03

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