Hello all, Using the piker yosemite installer, I've got 10.10.5 running on my original 2.0Ghz. I'm running an EVGA Geforce 210 1GB with the quattro mac drivers from nVidia's site. [love the passive cooler, bus-powered, and DVI/SVGA/HDMI] (It took a while to find the proper drivers that matched the OS ID.) I'm running the OEM 160GB WD drive, and 8x 512MB ram chips. I saw an A-Data 8GB (4x 2GB) set on Amazon for $20. Now I know that all the ram slots on the risers must be populated, but do I need to worry about which chips are in which slots? If I'm mixing capacities, which slots should I put the 2GB sticks in, and what slots should have the 512MB sticks? I use my MP mainly for photoshop CS6. Will the bump from 4GB to 10GB make a serious difference? Am I better off spending some money on a modern SATA drive?