I can't guess if the old XPS ran it smoothly. The rest of your software list don't run in the background exactly. Chrom, Office pretty much sleep and get swapped out if need be. So almost no load at all. iTunes usually isn't a load and I've run that on my 200 buck Asus x200ca with dual core celeron 4GB ram.

As to RAM, try 8GB to ward off the future.
Bob