Can't Find Laptop's Full Model Name

[Sanocon]

So I'm wanting to upgrade my laptop ram but my computer is picky on the actual specifications. Now the sad thing is. My laptop only gives half of the model name on the sticker and my OS isn't telling me what it is. This is the model name I have so far: Toshiba Satellite P50-A
So Does anyone know what i can do to find out the rest of the name? Here is the hardware which I know plays a huge part.

Intel Core 17-4700MQ @ 2.40GHz (It's Quad-Core with Hyperthreading)
Nvidia GeForce GT 740M
Built-in 10 Point Touch Screen

 

[MeteorsRaining]

Press Windows key+ R to open Run command, type 'dxdiag' w/o quotes, press enter. You'll be able to see your system model there.

 

[Sanocon]

Shows the same thing as the sticker. Just Satellite P50-A. No sub-model name. It should be P50-A-(insert random letters/numbers here) or it dosn't have the dash after the A.

 

[MeteorsRaining]

The laptop model is P50-A, what else are you looking for? Downloading Speccy or CPU-Z will give more technical info.