You can get a barrel adapter to go from 7.4mm to 4.5mm. I have never tried to use of these adapters, and as stated above your current power supply may not be powerful enough for the new laptop. There also might be communication issues between the power supply and the laptop. It's worth a look...
According to the Dell forum posts, the system supports up to 8GB. Since, we're above that Dell says is the limit, we should probably go by what the chipset supports. I would just make sure the computer is on the latest BIOS available from Dell.
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