Question on upgrading RAM

[gizbug]

Right now I have two sticks of CORSAIR DII800 CM2X1024-6400
Wondering if there is any harm if I purchase/put in a stick of PNY - Optima 1GB PC2-5300 DDR2 DIMM Memory or Corsair - Value Select 1GB PC2-5300 DDR2 SDRAM DIMM Memory in with it.

 

[Nocturnal]

It depends on the motherboard. If your motherboard is picky about that kind of stuff then it may not work. Also I noticed that you already have DDR2800 and then you want to add DDR2667, I don't have much experience with DDR2 so I can't comment if that will or will not work. Just try it and see if it works.