What's my bottleneck?

The $25 ones look reasonable to me. They've gotten pretty good reviews on Newegg as well, for what that's worth.

Cool. One last question. Is it okay if I bought 3 of those for $75 and kept one of my 1gb sticks I have now? Giving me a total of 7gb.

Both the new and the old sticks are by Crucial and they are all DDR 2 800. The only difference is that one of them is 1gb instead of 2gb. Is that bad?

Yeah, with dual channel RAM, you want matched pairs. You'd end up with a slower system if you do it that way.

Buy 2 2GB sticks and use those and 2 of your 1 GB sticks.

Cool. One last question. Is it okay if I bought 3 of those for $75 and kept one of my 1gb sticks I have now? Giving me a total of 7gb.

Both the new and the old sticks are by Crucial and they are all DDR 2 800. The only difference is that one of them is 1gb instead of 2gb. Is that bad?

Rather get 2x4GB, older MB like urs, didn't like 4 DIMMS too much. many boards had trouble getting 4 DIMMS stable. I had a AMD 939 board too, It couldn't hadle 4 DIMMS. 3 was max.
Memory is so cheap now that 2x4GB shouldn't set you back much and on bords with a Front side bus like urs. always buy overrated ram. Get the 1066, not the 800. You can still run them at 800 if you fr some reason can't do 1066 on them (like not having a FSB to mem ratio, so you have to overclock the CPU to get the mem up at its 1066 default speed)

But your CPU might even take the OC just fine. and the price difference between 1066 and 800 ram can't be much.

According to his board's manual, it can't handle 4 GB DIMMs. 2 GB max per DIMM, 8 GB max total.

When I'm running TOR on Win 7 Enterprise, with very little else running, I'm usually over 4 GB used.

Bet a bios update should fix that, what MB does he have? I missed it, just ssw he had a dual channel AMD board and that must mean a socket 939. If it has the Nvidia 680 chipset he really should stay clear of 4 DIMMS

Then you have spyware running riot on your PC.

My PC with 4GB RAM -

http://imageshack.us/photo/my-images/687/4gbk.jpg/

My PC with 6GB RAM (yes thats how little I value the extra RAM over 4 GB - I normally run with 4 GB) -

http://imageshack.us/photo/my-images/685/6gbp.jpg/

Running SWTOR. Notice how much I'm using? So I put in the extra 2 GB and I am still using around the same amount - 2.5 to 2.6 GB.

3 GB is enough to run SWTOR, that's an absolute fact. 4 GB helps run it and allows for smoother alt-tabbing etc that is why I'd recommend 4 GB - it makes zero difference to the game however.

Some of you are just gonna make the OP spend money on buying something he simply does not need and will not make the blindest difference to the game.

That's a clean install of Windows 7 Pro, latest drivers, 4+6 GB RAM tested and the game still runs like utter CRAP in a few zones.

If the OP still decides to buy more RAM after this then I'm glad because he obviously needs to learn. I do this for a living - I have my own business doing this in fact but if he wants to listen to forum heroes with zero clue then on his wallet be it.