Miscellaneous laptop discussions : inspiron e1505 intel 945 gma

inspiron e1505 intel 945 gma

i got the dell inspiron e1505 with the integrated graphics chip. i actually wanted the dedicated memory option the 128 mb or the 256 mb ati chips. what difference does it make to the e1505 when you choose the ati chips as opposed to the integrated intel chip. if its not much of a difference then i would not switch to an e1505 with the ati chips x1300 or 1400. i believe none of the two ati chips are completely dedicated graphics card..they do share some of the system memory. also i noticed the intel chip is actually 256 bit while the ati ones are 64. i am really confused. i love the laptop but the graphic options have gotten me confused. i do wanna play games like warcraft, red alert, gta and some other 3d/non 3d games. please help me out.

one more thing: did anyone notice the flashing cursor hourglass thing, i fixed it by removing gtb.exe from startup. i also think there is a slight difference of max volume in the power dvd and the windows media center dvd player. i could be wrong, its very subtle if any. maybe there is no difference, i dont know.
also when i use the power dvd program ,the dvd starts of very smoothly to the menu and the opening screens. in the windows media center dvd player, there is a slight slowness in the opening screens to the menu on some movies i watched. otherwise all is good. i have 1 gb ram and 120 gb hard disk (15 mb is reserved for the system restore data). how do i check on my system if my display is true life or not, its widescreen 15.4 display and its very bright and glossy and beautiful. the diaplay was the selling point for me. my friend had one and he showed it to me.
thats it, sorry for the long post. hope u guys can answer my questions