im kind of a newbie when it comes to ram, i already have 256 of ddr ram, and i am wondering if i need to match the ram, like brandwise for an upgrade? does differing speeds in different sticks of ram matter?
I'd suggest getting an identical stick however it isn't necessary. I'd do it just to avoid any potential problems between brands (although I doubt there are any). Also, if you've got PC2100, don't buy another speed. Stick to whatever you've already got.
running 512 and a 256 of the same speed may change the oc you get as differnet brand will give you different oc's and also you can get slightly worse performance when running two sticks, but currently you not overclocking so this wouldn't effect you. There is also a very small chance that you could get errors by running two diferent brand sticks but this is unlikly.