This is like comparing a silicon graphics computer to a gateway.
SGI:
Single 800 MHz or 700MHz MIPS R16000A processor with 4MB L2 cache; 200 MHz front-side bus
Graphics
Integrated vertex processing engine
Integrated image and texture engine
12-bit per component color and alpha (V10, V12), double-buffered (V12) 16-bit 2 buffer ( V12 only)
24-bit eye space Z buffer and 8-bit stencil
10-bit digital to analog (DAC) display interface
Multiple concurrent visuals (8-bit window ID)
V10: 32MB graphics memory, including up to 8MB texture memory
V12: 128MB graphics memory, including up to 104MB texture memory
Resolution up to 1920x1200 pixels @ 60 Hz and 72 Hz
Support for dual channel and stereo viewing mode
Memory
512MB-4GB synchronous double-data rate RAM (DDR SDRAM)
That probably costs about 3x as much as that gateway you mentioned earlier. You gotta see that specs dont really tell the whole story.