overclocking slim psp

whats a safe overclock speed for the slim psp? also what is the effect on battery, obviously itll take more battery but how much? i just installed irshell on my slim and it works!

you can set it to its highest...if its the same as the fat then 333mhz unless its capable of running quicker. The only effect on the battery is that it drains the charge a little quicker so the battery doesnt allow as many hours of gameplay. This isnt a permanent effect tho if you change the cpu speed back to default then the battery lasts its default length of time.