[QUOTE=sal289r;2480539]hi, i have asrock 4 core dual vesta motherboard. pt880 using intelpintium 4.3., on my motherboard i have two blue slots and two yellow slots where ddr goes, what i want to know if i can use one ddr2 at 1 gig in one yellow slot and 512 mb in other yellow slot, also i want to know if i can use both the yellow and blue slots using two 512mb in yellow slots and two 512mb in blue slots?[/QUOTE]
Unfortunately, you cannot mix DDR1 and DDR2 memory in the same system. Your system will not even POST if you do mix the two (or if it does POST, then you will likely damage your system). You can use either the blue slots only or the yellow slots only–but do not put memory into a blue slot and a yellow slot simultaneously. DDR2 and DDR1 memory are not compatible with one another in the same memory controller.