Upgrading a Toshiba Qosmio laptop memory (P55 mainboard)

Ancipital

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Jan 6, 2015
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Hi

I would like to put more RAM in my Toshiba Qosmio X505 Q860 laptop. I think the mainboard has a P55 chip which supports up to 8GB RAM (but I haven't verified the source of this information).

I have two questions:

1. Which is the maximum memory frequency that the mainboard supports?
2. Is the mainboard Dual Channel? Because I intend to remove on of my 2GB RAM modules and replace it with a 4GB (throw away the other module). Off course, if it is dual channel then I will buy 4+4GB.