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Not true. While they are rare, I have seen µATX boards that support mixed mode memory pairing.
– JohnyD
Commented Jun 2, 2010 at 11:42
Frankly, I agree with c10k you can't do this. If you think you know of board which will use DDR2 & DDR3 simultaneously then please post the make and model number so this can be verified.
– irrational John
Commented Jun 2, 2010 at 12:54
@irrationalJohn Asus P5KC and MSI P35 Platinum Combo among others. Both're P35 boards which had support for both ram types in the chipset. They were never common since only a handful of upgraders would have any use for them.
– Dan Is Fiddling By Firelight
Commented Oct 10, 2011 at 3:30
The P5KC's specification says "Dual-channel DDR2 1066/800/667 MHz or DDR3 1333/1066/800". The manual says, "You can only install either DDR2 module(s) or DDR3 module(s) on the motherboard, otherwise, the system will not boot up." (Page 2-14)
– David Schwartz
Commented Jan 16, 2013 at 7:28

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