DDR ram is it backwards compatible

Ravenit

Senior member
Feb 25, 2000
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I have a moterboard that can run up to pc2700 / 333mhz ram, can I use a stick of pc3200 / 400 mhz ram ram? If yes can they be mixed together like say PC 100 and 133 on a 100 mhz bus.
Thanks
 

AndyHui

Administrator Emeritus<br>Elite Member<br>AT FAQ M
Oct 9, 1999
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You can mix DDR SDRAM with other DDR SDRAM and DDR SDRAM speeds.

You cannot mix DDR SDRAM with SDR SDRAM. Different voltages, different number of pins.