This improves the signal characteristics over the traditional DDR2 topology. Figure 3: Fly-by Topology for DDR3 Unbuffered DIMM The draw-back to this approach is that the delay from the PHY output ...

labels may confuse you since many DDR3 SO-DIMM RAM use frequency (MHz) as their performance metric. Here's a table so you can compare your laptop's DDR3 RAM to the ones being sold in stores ...