I use the following sequence with a new build.
1st. Determine your budget, unless you have unlimited resources because there will always be trade offs. (If you have unlimited resources, please generously donate to the g-paw relief fund
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2nd Decide on the CPU, this dictates the MOBO and memory. This site has an excellent CPU guide, although you’ll have to wait for the update if you’re thinking of Conroe. When looking at the chart, focus on the tests involving what you will be doing, e.g., I’m most interested in video editing because that the my most resource intensive use. If your planning on over clocking, this will be important, if not, you can pretty much ignore this in reviews. It’s a good idea to look at 2 CPUs, e.g., the Intel 930 and 940, which one you chose will likely be dictated by your budget.
3rd. Once you decide on the CPU, at least the chipset, decide on the motherboard. I always use newegg.com Power Search limiting the search to chipset of the CPU. Decide what on-board features you want, e.g., if you’ll be capturing from a camcorder, you’ll want firewire or if you into heavier gaming, you likely want to look at Crossfire and SLI mobo. After you narrow your choice of mobo, check out reviews. This site and extremetech.com have could unbiased reviews and I’m sure there are others.
4th. Once you decide on the mobo, decide on the memory. Most memory manufacturers will let you search by your mobo (mfg and model) to see what memory will work. Today, I think you need a minimum of 1GB of memory.
5th decide on the video card, again choosing 2 or 3, your choice should be dictated by how you’ll use the machine, e.g., since I don’t play games, I look at lower end cards. If you’re a gamer, you likely would want to put more into the video and less in the CPU to stay in budget. Using the above, go with the 930 rather than the 940.
6th Decide on the hard drive. The higher the capacity, the more expensive it’s likely to be. Also deiced if you want one of two hdd and if you want to put more into a Raptor.
7th Decide on the audio card. Most on-board audio is pretty decent so this is a good area to save some money.
The reason I put the hdd and sound card last is that they are the easiest to upgrade when you have can afford to upgrade.
In buying parts, I think it’s best to go up one or two levels than what you need right now but don’t over buy. E.g., if you never plan on using dual video cards, don’t pay extra for this feature on a mobo. Don’t buy more video card than you’ll need. Remember, you’re building the machine so you’ll have no problem upgrading anything in the future.
When reading reviews or suggestions on sites like this, always judge them in terms of how you’ll use the machine. E.g., if someone suggests a mobo or CPU that’s good for over clocking and you don’t plan to over clock, give less weight to that review/suggestion. It’s not that they’re necessarily wrong, it’s just not relevant for you.
Keep in mind you should never have to use a hammer when building a computer. If something isn’t connecting or slotting in, you likely have it going in the wrong direction.