Yes you can do that and infact for future its best. As it has two DIMM slots and if you get one 4GB DDR3 1066/1333 MHz then you can further upgrade your PC in future with more RAM and get 8 GB.
^^ Any 4GB DDR3 1333 MHZ will be compatible. Compatibility is not an specific company issue. No matter which company's RAM you pick it'll be compatible.
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