Does anyone know or have experience matching DDR memory modules of possibly varying speeds and manufacturers on dual channel chipset motherboards, especially the new 865PE? Right now, I have 512mb of Samsung PC2700, so if I buy another 512mb module of say mushkin or crucial would these modules work fine w/ the samsung or is it advisable to purchase totally identical modules (In my case, another 512mb of Samsung PC2700)? Also, lets say I buy a PC3200 module, am I correct in assuming that it will work fine underclocked to PC2700 speeds? I remember reading in Anand's review that the new 865 chipset is especially picky with running dual channel DDR400. Is this also the case with DDR333?