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6-layer board stackup?

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allanvv

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I'm making a board with a Spartan-6 and DDR2 RAM. The 256 ball BGA escape can be done with only 4 layers, but the price difference between 4 and 6 layers from PCBcart isn't that high. I saw this six-layer stackup:

Milkymist One RC2 PCB Specification - Qi

Should I use this stack-up, having 3 signal layers, but better coupled ground/power planes? Or go with the standard sig/gnd/sig/sig/vcc/sig configuration?
 

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