Optiplex GX150

I bought RCT3 Gold for my nephew and he wants to keep at my house for when he visits. So while looking for an inexpensive pc for him I found the Optiplex GX150. Before I buy it for him I would like to know if the video card can be upgraded to play this game. The only thing I know about computers is that you turn it on, type something in and it finds it for you. I've searched all over the and can't find any info to help me, so you people here are my last hope. So any help would be appreciated. The system don't have a OS, but I'm gonna have Windows XP installed. Here is what I know about the one I'm looking at...

 

Pentium III 1 GHz

256 RAM I need to have upgaded to 512 RAM in order to play the game with XP.

 

System requirements for game...

 

Windows 98/Me/2000/XP (Windows XP recommended)

Pentium III or compatible (Pentium 4 1.3 GHz or compatible is recommended) Does anyone know if having Pentium III instead of Pentium 4 has any affect on gameplay ?

512 RAM for Windows XP

CD-ROM Drive 4X speed or faster (8X speed recommended)

Video 64MB or greater H T & L capable video they recommend ATI Radeon or GeForce 2 or higher

Sound 16 bit sound card

 

Thanks

Jeff