I'll get right to the point, I've been running 2Gig of RAM (DDR) for quite a while now and have had no problems, and I was Going through old computer parts, and found 2 more stick of ram, 512Mb each, both DDRs and thought might as well use them too.
System properties say I have 3.00GB of RAM.
It even lists is as I hoped as I boot up my computer...
But how can I be sure that my computer is really using that RAM?
I'll list hardware and such, but if I missed something you need to know, ask me
Microsoft Windows XP
Service Pack 2
If you have the 2 1-gig sticks in 1 channel, and the 2 -512 gig sticks in the other channel, then you are running in dual channel mode. However, unless you are doing something that requires the extra memory, you won't notice any difference at all.
Now, if the 2 -512meg sticks are slower memory, then you have just slowed all the memory in the system down to their speed. Most boards in fact will default to a slower memory speed when you populate all 4 slots. (That is why we tell you to buy 2-2 gig sticks if you want to run more than 2 gig of memory) So, in general day to day use, you are likely going to have a performance loss instead of any gain.