Two same, but different RAM together?

Ri9

Honorable
Dec 5, 2013
4
0
10,510
Basically I bought a gaming PC that was custom built by a company, it only came with 4GB of Corsair Vengeance DDR3 1600MHz RAM. Can I buy the same spec RAM now and it work?
 

Tradesman1

Legenda in Aeternum
Might or might not, any time you mix DRAM can be problematic, even with the same exact sticks/sets, also if 1600 or better, XMP won't work as it's programmed by the packaged set (for the number of sticks in a package), with lower freq DRAM like 1600 and under it's a decent possibility, but still basically a crapshoot, higher freq DRAM can be much worse - see people here everyday with mixed DRAM that doesn't play together