Question about ram and speeds of ram...?

well if you have two different speeds of ram in the same computer, the faster ram will downclock to the slower rams speed.. to match it.

as far as different density sticks, that doesn't matter much. you can mix and match whatever size sticks you want, as long as they fall into the same Mhz and type.

usually a stick that is slightly faster is also capable of running at slower speeds,

but like a stick of DDR2-1066, wont run with a Stick of DDR2-533, the 533 is just to slow for the 1066.

also make sure the voltages are the same on both sticks, if one is 2.0v and the other is 1.8v, you might get some violence when the 1.8v tries to run at 2.0v if you get what im saying.

but here is something easy to do.

Use CPU-z to find out the various supported speeds of your memory

http://www.cpuid.com/cpuz.php

just click the SPD tab on that program, over on the left is the Slot#,

each stick will list its various speeds below on that chart, if both sticks say the same speed on that chart somewhere, then they are compatible.

But if you have the cash, i'd go ahead and get a new stick(s) with the fastest speed possible for your computer.

best o luck man!

If you mix frequencies, each RAM modules will only run at the speed of the lowest frequency RAM module.

So if you have 1GB (1 stick of 1024MB) running @ 400MHz and 2GB (2 sticks of 1024GB) running @ 266MHz, the 1GB @ 400MHz will only run at 266MHz.

It won't hurt, but you wouldn't be running the RAM at it's full speed.

Go with the 3GB (3 x 1024MB) @ 400MHz.