Can i use two 2gb ddr3 on my lenovo g400 ??

and can i use ddr3 and ddr2 on my lenovo g400??

hi karin99,
Welcome to Lenovo Community Forums!
According to Lenovo Tech Specs.
the Ideapad G400 can support these configurations.
highlighted is your preferred upgrade right, and it should be compatible.
Memory
Up to 16GB DDR3- 1600Mhz(Support Dual Channel)[2 SODIMM slots
one 2GB
two 2GB
one 4GB
one 2GB plus one 4GB
two 4GB
one 8GB
two 8GB
You can refer here for your Replacement / upgrade guide.
Hope this helps
Cheers!
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