Number 2. Better latencies at less voltage? Almost certainly better chips in those Mushkin's, probably with some headroom to play with, if you're so inclined. It'll be quite some time before 4 GB isn't enough for a regular desktop. I'm a chronic parts collector myself, but I honestly don't see the need for 8 GB of RAM, unless I was planning on another cheap build up in the near future.
__________________ i7 2600K | ASUS Maximus IV GENE-Z | GTX Titan | Corsair DDR3-2133
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