I bought 1 stick of 4GB but of a different brand of that I already had. But they have...

[Rosen Emilov]

I bought 1 stick of 4GB but of a different brand of that I already had. But they have to be able to work together. The problem is that I can not even get to the BIOS if it is together whit the old stick or alone . PLEASE HELP . + Sorry if if I misspell something " Like probably that " .

 

[David Quinn]

Are the diffrent speeds?