do i need to by ram all in one kit?

Blain

Lifer
Oct 9, 1999
23,643
3
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You can use two 4GB kits, but I would buy two of the same model kits, not mix & match.
The Kingston kit is volted at the JEDEC DDR3 standard of 1.5v.
Of the two kits you linked, I would buy two of the Kingston kits.