Its very common when you get into computers and especially games, to focus on speed, can I run this and that game and so on. It’s an understandable question but one that is not Easy to answer. Not in one sentence or even one book.
To give you an example I am currently sitting on an Intel I7 920 CPU based computer, I have 6gb of ram and an Nvidia 285gtx graphic card. This is coupled with 3 x 1TB disks in RAID0 purely for performance reasons. This should be sufficient right? I can play graphic heavy games with max settings?
Actually no I can’t, the reason is my monitors native resolution is 2560×1900 pixels. I know it’s a daft example but it’s to illustrate a point. All factors need to be considered when asking these sort of questions.
There are way more factors that matters when putting together a good computer then mzh and amount of ram. Like this setup I have here now, this is my second computer I have running raid disks, the first one did not go so well. I had 2 of the 3 hard disks fail after e few weeks. It took me a while to understand why but in the end it turns out my power supply was low quality and did not deliver enough power evenly to all the parts of my computer.
So the drives actually ran for a long time with the wrong power input, and consequently broke relatively fast. This was so marginal that I could actually hear a difference in sound on my computers fans. At the time I had about 6 USB devices connected and powered through the usb ports. If I unplugged them all I could hear the fans in the computer running faster.
Building a computer from parts is a really fun way of learning more about them in general, but it requires you to be interested enough to research and read about all the factors. Not just how much money you can cram into your new computer.
Make sure your parts match the other parts and that you have a good power supply. A good power supply does not just mean 1200Watts. Mine was 1200 watts but it was low quality and could not deliver even power.