Upgrading the "Big Computer"

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http://androidforums.com – For some reason , this "beast" is often called the big computer in my house. Specs as I know it : 1.6GHz AMD Sempron Sing Core 80GB HDD 1GB standard RAM A PSU of some kind Standard CD Drive I was thinking of keeping this as I porbably wouldnt be able to sell it. Question is , would upgrading anything be cost-effective and beneficial for the PC? I was thinking of getting a 4GB RAM Kingston 4GB 1333MHz DDR3 Non-ECC CL9 DIMM Memory: Amazon.co.uk: Computers & Accessories Getting a new mobo and a new CPU is a bit expensive so I might leave that? Mabye a SSD? OCZ AGT3-25S (General)