Question about DDR Dual Channel

Right now I have 1 gig of kingston PC3200 Ram running at 512MB x 2 Dual Channel. My question is that if I want to upgrade and get more ram is it possible for me to continue to dual channel the 512x2 alongside with 1gigx2 totally 3gigs of ram working at the same speed PC3200

if yes then is it possible for the 1gigx2 ram to be at different speed say PC4000?

ORRR... with the price of Ram now I would even just replace it all and buy the fastest ram your machine will take.

Yes, I would think that if you were to add 1GBx2 + 512x2 for 3GB that it would work. I would reccomend that the RAM be the same speed (PC3200), and that you install the them in pairs, and in the correct DIMM sockets. I.e. slots 1+3 and slots 2+4. Also stick with kingston, a technician would tell you that its best to stay with the same brand of RAM.

so yes to the first question.
no to the second question, I would stay with the same speed of RAM. (PC3200).

One other thing you can do to be absolutely sure is to check you motherboard manual to find out what RAM is supported. Your looking at DDR RAM. (400Mhz).

Hope this helps.

I´m just having a problem adding 2x1Gb to my 2x512Mb, I already try all the combinations, and I can´t get Bios or Win XP see all the memory. I put it in dual channel, single channel and it seems there is no way to fix my problem.

I have a MB RS480M2-IL with AMD Athlon 3200+, all my memorys are Kingston PC3200 B400.

I can get the system start with the 4 sticks, but only CPU-Z could see my 3 Gb, but the system has some instability.

Is there a solution?

PD.- Sorry by my english (it isn´t my native language)

DDR Ram is becoming rare and is increasing in price too.
Shop for deals and you might get lucky.
Right now the DDR2 rig is the way to go.