Ram

[zip86]

Is it ok to use one stick of 128MB PC2100 and one stick of 512MB PC3100 Ram? I don't know if two completely different cards are compatible.

[lil Jimmie]

In most cases it will be fine the system will just default to the lower speed ram.

[zip86]

Does this mean whether I get pc2100 or something higher, it won't matter, it will always work on the lower speed (2100)?

Would it help at all if I replaced one of my 128 PC2100 with a 512 PC3100? or should i get 512 PC2100 since its the same anyways?

[lil Jimmie]

When mixing different speeds of ram the system will only run as fast as the slowest stick.

[TwoRails]

Althought things have gotten better in recent year about using different types / brands of memory in the same mobo, there is really no guarantee they will work together. Chances are better, but it's still a hit and miss thing...