In case you haven't noticed, memory prices have dropped through the floor. As such, I've been busily upgrading every computer I can get my hands on. For example, my 2009 MacBook Pro has been maxed-out to 8GB, which involved buying two 4GB SODIMM modules. The cost? Just US$97. I dare say I could have got them even cheaper if I'd shopped around.
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Building a PC is a little like walking a tightrope without a net. Okay, it's not quite that dangerous, but unlike buying an off-the-shelf system, you have to be your own tech support staff.