If you use a 256MB & 512MB, it doesn't matter which goes to which slot. The performance will be the same.
I would agree with what you've said. Put the 512 in the primary slot and 256 in a more easily accessible slot so you could upgrade it in the future.
I would agree with what you've said. Put the 512 in the primary slot and 256 in a more easily accessible slot so you could upgrade it in the future.








