I've got 2X256mb sticks of Samsung PC1066 RDRAM. I'd like to increase it to at least double, and get two more 256mb sticks. My question is, if I decide to get two more 512mb sticks instead, and add them to the two I already have, will this work, (2X256, plus 2X512)? Also, what if I mix brands, does it have to be the same brand, although, from what I've checked on so far, there's not much choice for my type of ram anyway, and it's not cheap. I know this has probably already been answered somewhere in the forums, but I couldn't find it. I've got a Pentuim 4, 3.06, Intel D850EMV2 motherboard, rest of specs in my profile.