I would say nicer garphics and when it comes to pete's opengl2 plugin better compatibilitie to but if you want the best out of opengl stay away from ATI
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Specs: AMD Athlon X2 5000+ (2.7 GHz),2 X 1024 DDR2 Xms2 6400 Corsair, 2 X 512 DDR2 Kingmax Mars 6400 (both corsair & kingmax Dual Chanel),ASUS EAX1550 256DDR2
OS Vista 64 bit