Adding a different RAM to exsisting ones

[gunstar]

I'm getting an X2 CPU in a few days time and I remembered I got an extra stick of 512RAM laying about. If I remember right this ones timings are slightly faster than the ones currently in my PC which are Dual Channeled which are also budget RAM.

When I get my X2, I was thinking about adding that stick to the rest to give me 1.5GIG of RAM. Any precautions about doing that? I know the fast one will slow down it's timings to match the other 2.

Do I take the old 2 out of Dual channel to make the 3 work together?

The fast one is also a different brand to the current 2 sticks. Will that be a problem?

Also how fast is Dual channel compared to non Channeled sticks? Percentage would be nice.

Also, is 2GIG of RAM nice for the X2's to have or is 1GIG ok for it?

It's not a problem if I can't do this, has I'll happily stick with 1GIG and update later but the nice 512RAM extra would be nice to boost the X2's performance

[#43 fan]

You might have a problem running different brands, but I doubt it.
More RAM the better.
Dual channel adds maybe 5% more speed, if that. The more RAM [1.5 vs 1 GB] would make up for that.