Question: why psp is better than ps2?
Answer: PSP has one special 3D math coprocessor but it is surprisingly powerful and much easier to program and in many cases faster. ... A PS2 screen at 640 x 480 has 2.3x the area of a PSP screen at 480x272. As a result a typical PS2 games has quite a lot more to draw and so it needs that extra power.