Athlon 64x2 is a type of cpu more oriented towards home computers and the only reason it says x2 is because it is a dual core cpu(wonder if they're going to make athlon 64x4 cpu's...)
Opteron is a type of cpu oriented for servers.
They already made it, it's called the Phenom x4 and Phenom x3 processors. You'll see the tri core processors at a later date.
As for quad core nothing(to my knowledge) uses it right now so its pretty much useless(unless you want bragging rights)
Wrong, quad core CPU have alot of use right now in terms of multitasking and we are beginning to see more and more applications support it, more so multimedia applications at this time.
cause in a year they will have better quad cores for a better price and more things will use more then 1 or 2 cores.
There is always some better around the corner, that's what makes technology interesting.
And the cache im also not sure about(although i do know that the wiki page is complicated)
The cache is larger on Intel CPU's because they do not have a intergraded memory controller. Because of AMD's intergraded memory controller, the CPU has better access to RAM and smaller latencies allowing them to create a CPU with less cache. Next year Intel's CPU's will have much less cache as well, as Nehalem will have the intergraded memory controller.
I also have a question about the different in wattage on the cpu's. There is an option between 65W, 89W, and 125W. I also have t option for the Cache to be 512, or 1mb. What do these options mean, and which core is better? The Brisbane, or the windsor?
This depends on two things, what frequency the CPU is operating at and the manufacturing process (e.g. 65nm and 90nm).
The Windsor core is on a 90nm manufactuing process.
The Brisbane core is on a 65nm manufactuing process.
The smaller the manufactuing process the cooler and more energy efficient a chip will become.
In addition to this, what do you guys think of the quad core and the future of it? is it strong, or do you think that it is behind the game with intel?
At one point we had the Ghz war, now we are entering the core war. The more core you have, the better the computer you have, assuming all clock rates are the same. It's just that simple.
The difference between am2 and am2+ is that am2+ is faster(i think) and all the amd quad cores use it.
Wrong. AM2+ has a few added features, it's just filling a gap before AM3 enters the market. AMD quad cores are backwards compatible onto AM2 boards.