Quick Guide into Acer Aspire Laptop, to understand their codes,
Example: Aspire 5750G-XXXXXX
The First Digit "5" represents the Screen Size 15.4, if it was 4750 then the screen would be 14 inch
I had the 8920G, so as you can guess my screen is an 18.4 inch screen
The Second Digit "7" represent the luxury/design + Features, it also gives what class of processor range
This is An Acer Aspire 5950G
http://www.notebookcheck.net/uploads/tx_nbc2/ace5950G.jpg
This is An Acer Aspire 5750G
http://www.notebookcheck.net/typo3temp/pics/d663307d14.jpg
The last two Digits "50" represent generation model, but its getting mixed up the days, usually the higher its the newer generation it is.
Then there is Letter after,
G = Graphics or Gaming, which has a dedicated VGA
Z = low end processor, cheap price
D = 3D screen, usually DG since they need a dedicated VGA
P = Touch screen, usually PG since they need a dedicated VGA
you can have more than one letter
Finally there is the XXXXXXXX, this is where you have to pay attention the most. this specifics of the laptop. it tells you, which version of windows you have (Starter, Home Premium, Professional, or Non), which processor 2.4, 2.5, 2.6, etc.., RAMS, which of the VGA is built in even if you have one or two HDD. So pay CLOSE attention to the model.