Long story short, I ended up with the above mix of RAMs. I have a Win7SP1 32 bit machine with 4 RAM sockets max 8GB. I am not sure which mix of RAMs is better overall for normal use with some non-demanding games (steam). I know the 3x1GB mix will not run dual channel unlike the 4x1GB mix.
However, will 4GB dual channel symmetric at 266Mhz triumph over 3GB dual channel asymmetric at 667Hhz?
More about3x1gb ddr2 4x1gb ddr2
If your 4gB is really 266MHz then 3gB will be way better. I don't think that the speed will be that low. Please reassure
Sorry, seems HWINFO gave me wrong readings. I physically inspected the RAMs and I got it now. Many thanks for your reply.