The two test boxes I have for playing with linux are an i865 based Celeron 2.4Ghz with 2x256MB DDR333(?) ram and and Intel Extreme Graphics 2 IGP. The second is a i845 based 2.53Ghz P4 with a single 512MB stick of PC2100 RAM, it also used the Intel Extreme Graphics 1 IGP. However, since that system only has single channel RAM, and Compaq saw fit to equip it with a single stick of PC2100, performance was dismal using the IGP. Even poking around the stripped down XP GUI was sluggish. I installed my backup vidcard, a PCI FX5500, in the system. It helped improve the system's performance by allowing the P4 to grab all the memory bandwidth for itself.
Not like anybody cares about my antique testbeds though, they serve mainly for S@H. 🙂