Can I mix ram with different brands but the same speed?

[AnimDZ]

Question is in the title

 

[QwerkyPengwen]

It's not guaranteed to work but as long as both brands are of same quality like ripjaws mixed with vengeance then you should be fine as long as speed AND timings are the same. Can't forget the timings.

 

[R_1]

no guarantees as xSimply1337x said.
you never know till you try. I strongly suggest adding the RAM and testing the lot with memtest86 overnight or 3 passes.
if the system stays stable and you get no errors you are good to go

 

[Houtsgraphics]

Question is in the title

You're never 100% sure if it's not the same memory because of the timings, you can even mix ram of different speeds but they'll run at the lowest common speed. Your best bet is to order sticks of the same type you've got or just upgrade everything with the same type.