If you go in 24x or above with a lite-on it will use Z-CLV (diffrent speed) so you get a less reliable copy. In a computer it probably won't matter but for a psx it is a disaster.
If you want a perfect working copy for psx then use 1x or 4x. If you have a lite-on you use 8x because it can't burn any slower than that.
use this link to see what speed your writer use CLV and Z-CLV.
CLV = constant speed whole disc
Z-CLV = diffrent speed
http://www.cdrlabs.com/reviews