I like to build my own desktop PCs, and I happen to know that I've got a rockin' processor and graphics card both, so my system definitely has some punch to it. I also know that I didn't get the best motherboard on the planet.
I know that the motherboard houses the various buses that the processor uses to communicate with all the other various hardware on the board, and I'd like to know how the speed of those buses affects the overall performance of the PC. In other words, what are some common "gotchas" to watch out for, and where to I really not want to skimp out on general motherboard performance?
This is not a "which motherboard is the greatest" question, I'm not looking for a specific model, I just want to know which features I should watch out for when shopping on my own. In the same line of thought, this is also not an "is an Intel better than an AMD motherboard" question, under the same line of thought.
Answer
The primary bottleneck has traditionally been front-side bus speed. Several years ago AMD moved the memory controller onto the CPU, so the front-side bus was running at clock speed. Intel finally followed suit with Nehalem (Core i7). The next point of contention is the speed to the RAM itself, where higher is better.
Now we get to the expansion slots. What is best for you depends on what you want to build. Are you planning to run a single graphics card, or two? The number of PCI-Express slots varies between motherboard models, and the capabilities vary too. Some motherboards have a single PCI-X16 slot, others have two. How many PCI-X4 slots do you need? PCI-X1?
Most people don't think about this, either because they don't know or don't care, but the slots closer to the CPU are slightly faster. The difference is very small. If you want your sound card close to the CPU, you'll want a board that has a PCI-X1 slot at the top of the stack.
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