Bought a Dell Precision M6400, have a few questions.

Just bought this laptop from a friend for $30usd, it came only with a QX9300 and a Quadro FX3700M, i added 4GB of ram and a 5400rpm HDD. The thing is, it came without battery and charger so i'm using a charger which doesn't delivers enough power (120w, stock is 210w) to run the CPU at max speed (it is capped at 1.5Ghz, original is 2.5Ghz aparently).

1.- I was wondering if it's any worth buying a new battery and a charger (40$ aprox. each one on ebay) due to the age of the laptop (2008).

2.- I'm currently using a Toshiba L755D (A6-3400M, HD6520G, 4GB, 5400RPM) for school (programming, AutoCad, SolidWorks) and a few games when i have time. ¿Is there a any performance upgrade between the Dell Precision and the Toshiba L755D?

3.- Whic is the best mGPU i can install on this laptop (donesn't matter if i have to do some mods)?, i read somewere it could be the Quadro 5000M but haven't found anything else about that.

Thanks in advance!!

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Bought a Dell Precision M6400, have a few questions.