the intel 82865G graphics card runs with the following specifications....................................
Enhanced 2D 256-bit internal path
8/16/32bpp
DirectDraw*, GDI, GDI+
Anti-aliased text support
Alpha blending
Alphas stretch blitter
Hardware alpha blended RGB cursor
Color space conversion
5x2 overlay support
Rotate, scale and translate operations
High-performance 3D 256-bit internal path
32bpp/ 24ZorW/ 8 Stencil
DX7*/DX8*/OGL*1.1
DXTn texture compression
Up to 4 textures / pixel on a single pass
Cubic reflection map
Embossed/DOT3 bump mapping
Multi-texture
DOT3 bump-mapping
Point sprites
Video and Display DirectShow*/DirectVA*
Hardware motion compensation support for DVD playback
4x2 overlay filter
350 MHz DAC frequency
Maximum DVO pixel rate of up to 330MP/s
Flat panel monitors and TV-out support via AGP Digital Display (ADD) cards
350 MHz DAC for 1800x1440 @ 85Hz max CRT resolution or 2048x1536@60Hz max FP resolution
Synchronous display for dual monitor capabilities
350MHz RAMDAC for up to QXGA analog monitor support
Dual DVO ports for up to QXGA digital display support
Multiple display types (LVDS, DVI, TV-out, CRT)
this will play rollercoaster tycoon however you may need to lower certain settings such as texture and detail and you may have to keep the resolution down to 800x600 or 1024x768
most modern intergrated graphics card(intel 82865/nvidia 6100/s3 chrome have pixel and shader model 2.0 by standard,this will run quite a few games
however to really enjoy a game at its recommended settings a dedicated direct x 9/10 graphics cards using a pci-express/agp slot is needed
for your reference here is a list of games that "will" play with your graphics...http://www.intel.com/support/graphics/sb/CS-010472.htm
any probs let me know
good luck mate!