Mixing ram like that can yield.

1. Will not boot
2. Cause all kinds of hair pulling errors.
3. Works like we want it to.

To quote SS.

The whole point of buying a kit is that they match the modules up so that you can be sure you are getting the ultimate performance from that RAM.


Now when I upgrade a computer's ram, I will replace whatever is on board with a kit as I do not feel like fighting problems.