Just had a new P4 motherboard installed: ECS P4M800PRO-M478 (V1.0) which replaced the original Celeron board that died suddenly. The new motherboard has 4 memory slots, 2 for DDR1 and 2 for DDR2. This board has a maximum 2GB capacity. The manual says you can't mix memory types. I read that to mean you can install up to 2GB in the DDR1 slots or up to 2 GB in the DDR2 slots but 2 slots will always be unused. Is this correct? The manual should make it clear but but to my mind it doesn't. Thanks for any clarification.