I've got a modestly-powered Samsung laptop with an i3 processor, integrated graphics and shared memory, Win7 64bit, etc.
I upgraded my RAM today from the stock 4gb Adata that came with the laptop, to a shiny new 4gb stick of Corsair Vengeance DDR3 1600. I was hoping to see some decent gains in my WEI scores but to my dismay, the scores were either the same or lower. I did the test a few times and here are the results:
Brand name also doesn't matter. Your timings and frequency will be the factor. Also you could actually have faster components and get a lower score just because WEI isn't all that accurate. For example. I overclocked my CPU 15% and the score never changed. If it was accurate my score would have been 15% higher.