3-3-3

Hello Friends.... this is my first post..so if any error then pls tell... My problem is....i have IBM 2GB(2*1GB) PC2 3200 CL3 ECC SDRAM RDIMM 1.8V 3-3-3.... and i am going to purchase a new system with 2*1GB DDR2 667Mhz RAM.... My question is can i use both in one motherboard which have 4...