Question about dual channel ram setups

[MKE]

ok, my new motherboard will do dual channel, however, i dont want to spend the money now for 4gb's of ram. I have 2 1gb sticks now.

I know the 2 sticks running together have to match, but if i purchase a kit later (year or so), can i put them in and have the 2 sets both working in dual channel, or should i try and purchase them asap.

[Caboose]

It's best if you have 4 of the same type, but it doesn't really matter unless you're really hardcore.

[Disheveled DrFreeze]

running different types of ram might ruin your overclocking potential, and running 4 dimms on a 939 amd cpu might drop it back to 333 mhz (depending on stepping, this only applies to clawhammer, newcastle and winchester chips, on anything later, such as venice, san diego, toledo and manchester cores, it just drops to 2t command rate)

but it shouldnt really be a problem, i have a 939 amd x2 (manchester x2 3800, E4 stepping) running 4x512, all dimms are kingston hyperX, but one set of dimms actually has higher PCBs, and quite possibly different ram ICs, because i bought them more then a year apart

[mariobro]

Looks like AMD systems are more forgiving when it comes to dual channel. I used to run a 512 and a 256 module, different speeds, different brands, and they ran OK.

I noticed a big improvement in system response, a lot quicker, but almost no difference when running software.