Difference in openGL render between two different computers

Hi,

I am working on some installation on my Mac machine, but the installation will be actually displayed on a PC. Yesterday I tried for the first time my patch on a PC and the render was very different. The patch runs a particle system that has no textures - it's just geometry matrix. And the way that that mass of points and lines is displayed is very different (regardless of the color variations).

Tech specs:

- Mac

Model Name:    MacBook Pro
Processor Name:    Intel Core 2 Duo
Processor Speed:    2.4 GHz
L2 Cache:    4 MB
Memory:    2 GB
Graphics:
Chipset Model:    GeForce 8600M GT
VRAM (Total):    256 MB

- PC:

Dell
Intel HM57
NVIDIA GT 555M 3GB graphics

1. Do I need to install anything specific on a PC machine for a optimal working of jitter on a PC?
2. Is the problem only in various graphic cards?