it must be XP2500+, actual 2 GHz not 2.5 GHz!
if the chip really ran at 2.5 GHz it would actually be XP2700+ rating!
However, it may be possible to run the chip at 2.5 GHz by extreme cooling, a too good overclocker board and some voltage mods. pretty expensive too!
<font color=red>Nothing is fool-proof. Fools are Ingenious!</font color=red>