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Building a PC: Advice wanted, especially on onboard graphics compatibility.

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http://www.linuxquestions.org РActual questions are in bold. Also specific hardware recommendations are welcome. So I'm planning on building a computer, to replace the ten-year-old workhorse I have at the moment. But I'm not all that knowledgeable about current hardware. The objectives are cheap and quiet. And of course everything needs to be Linux compatible. I have a few existing devices that I will want to use, and thus need support for. An IDE hard drive, IDE DVD Writer, PCI Wireless Adaptor, and PCI tv tuner card. The drives are the really important things, the PCI devices less so. I'm in England, and I'm hoping to bring it in to a budget of £200-250. Usage is going to be web browsing including streaming media, watching video (though probably not HD),office work, maybe some light gaming, but probably the most demanding thing is GIS (Geographic Information Systems). I might want to try running stuff in virtual machines too. For a processor, I'm thinking of an AMD Athlon II X3 435. Based on a magazine review, this seems to give the ideal price/performance ratio - anything more powerful means a bit of a jump in cost. Alternatively, I could go for a lower end processor and spend the money somewhere else instead. (More RAM is the obvious choice; would the ultra-cheap Sempron 140 and 4GB perhaps be better than the Athlon with 2GB?) I want a motherboard with onboard graphics, and here's the first question: What's the Linux compatibility of onboard graphics like?. Most motherboards for AMD processors have ATI graphics, but there are some with nVidia chips. Which is better for Linux compatibility? The second question: Is there much benefit buying any memory other than what's cheapest? I know there will be some performance differences, but are they worth worrying about in a budget machine? Also DDR2 is cheaper than DD3 now, but I expect in future that will reverse, so am I better off getting a motherboard that uses DDR3? I've read that power supply quality is pretty important; an unreliable PSU can cause issues. And I'll also want to pay a bit extra to get something quiet, though I don't need fanless. Considering my choice of processor (TDP 95W) and other hardware (HDD, optical drive...that's about it), What power rating do you think I'll need?. Finally, looking at processor heatsinks and fans left me utterly bamboozled. Advice when it comes to cooling is thus very much welcome (HowTos)